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Home / DTC / P1302 — Cylinder 2 Misfire

P1302 — Cylinder 2 Misfire

Detailed page for trouble code P1302.

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Code

P1302

ACURA P — Powertrain

Cylinder 2 Misfire

Brand: ACURA
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty ignition coil on cylinder 2
  • Worn or fouled spark plug in cylinder 2
  • Restricted or leaking fuel injector for cylinder 2
  • Low compression (worn rings, burned valve, head gasket leak)
  • Open/short in wiring or poor connector to coil/injector
  • Vacuum or intake leak affecting cylinder 2

Symptoms

  • Check Engine Light (MIL) on
  • Engine rough idle or vibration
  • Loss of power or hesitation on acceleration
  • Poor fuel economy and higher emissions
  • Possible misfire-related codes or misfire count for cylinder 2
  • Occasional bucking or stalling at idle/low load

What to check

  • Read stored/active DTCs and freeze-frame data with a scan tool. Note misfire counts and operating conditions.
  • Check for pending P0302 (generic cylinder 2 misfire) and related codes (fuel trim, O2 sensors).
  • Visually inspect ignition coil, spark plug, injector connector and wiring for damage or corrosion.
  • Swap ignition coil (or coil-on-plug) from cylinder 2 with another cylinder to see if misfire follows the coil.
  • Swap fuel injector or use an injector balance test to confirm injector flow on cylinder 2.
  • Measure fuel rail pressure to confirm correct system pressure.

Signal parameters

  • Misfire counter: non-zero events for cylinder 2 (as reported by PCM)
  • Short-term/long-term fuel trim (STFT/LTFT): deviations > +/-10% may indicate fueling issue
  • Injector pulse width: compare cylinder 2 pulse (ms) to other cylinders at same conditions
  • Coil primary/secondary resistance: compare to service specs (values vary by model) and to other cylinders
  • Compression: cylinder 2 static compression should be within ~10-15% of other cylinders (typical >90 psi / 620 kPa, check vehicle spec)
  • Fuel rail pressure: must meet manufacturer specification under no-load and loaded conditions

Diagnostic algorithm

  1. Connect a scan tool, record freeze-frame and live data (misfire counters, RPM, load, fuel trims, injector pulse).
  2. Clear codes and perform a monitored test drive to confirm P1302 returns and note operating conditions when it appears.
  3. Swap the ignition coil from cylinder 2 with a known-good coil on another cylinder. Re-test; if misfire follows coil, replace the coil.
  4. Inspect and/or replace the spark plug on cylinder 2. Re-test for misfire.
  5. Swap the fuel injector with another cylinder or perform an injector flow/activation test. Replace injector if faulty.
  6. Check fuel pressure and regulator operation to rule out fuel delivery problems.
  7. Perform compression and/or leak-down test on cylinder 2 and compare to others. If low, investigate valves, rings, or head gasket.
  8. Inspect wiring, connectors, and grounds for the coil and injector on cylinder 2. Repair any damaged wiring or poor connections.
  9. Check for intake manifold leaks or vacuum leaks near cylinder 2 that could cause a lean misfire.
  10. If electrical and mechanical checks pass, consider PCM/sensor diagnosis (crank/cam sensors) or consult manufacturer service information for model-specific tests.
  11. Note: Follow vehicle service manual safety procedures and specifications. Replace only failed components after confirming with comparative tests.

Likely causes

  • Ignition coil failure or intermittent coil driver for cylinder 2
  • Bad or fouled spark plug in cylinder 2
  • Clogged or electrically faulty fuel injector for cylinder 2
  • Low compression or mechanical fault specific to cylinder 2
  • Wiring harness/connector corrosion or short to cylinder 2 components

Fault status

⚠️ Status
P1302 - Cylinder 2 Misfire detected by PCM. Misfire count threshold exceeded for cylinder 2; check ignition, fuel, compression, and associated wiring/connectors.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.5 hours

Similar codes

P0302 P0300 P0301 P0303 P0304 P0305
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Code

P1302

DAEWOO P — Powertrain

TDC SNSR - SIGNAL LOW

Brand: DAEWOO
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty ignition coil on cylinder 2
  • Worn or fouled spark plug in cylinder 2
  • Restricted or leaking fuel injector for cylinder 2
  • Low compression (worn rings, burned valve, head gasket leak)
  • Open/short in wiring or poor connector to coil/injector
  • Vacuum or intake leak affecting cylinder 2

Symptoms

  • Check Engine Light (MIL) on
  • Engine rough idle or vibration
  • Loss of power or hesitation on acceleration
  • Poor fuel economy and higher emissions
  • Possible misfire-related codes or misfire count for cylinder 2
  • Occasional bucking or stalling at idle/low load

What to check

  • Read stored/active DTCs and freeze-frame data with a scan tool. Note misfire counts and operating conditions.
  • Check for pending P0302 (generic cylinder 2 misfire) and related codes (fuel trim, O2 sensors).
  • Visually inspect ignition coil, spark plug, injector connector and wiring for damage or corrosion.
  • Swap ignition coil (or coil-on-plug) from cylinder 2 with another cylinder to see if misfire follows the coil.
  • Swap fuel injector or use an injector balance test to confirm injector flow on cylinder 2.
  • Measure fuel rail pressure to confirm correct system pressure.

Signal parameters

  • Misfire counter: non-zero events for cylinder 2 (as reported by PCM)
  • Short-term/long-term fuel trim (STFT/LTFT): deviations > +/-10% may indicate fueling issue
  • Injector pulse width: compare cylinder 2 pulse (ms) to other cylinders at same conditions
  • Coil primary/secondary resistance: compare to service specs (values vary by model) and to other cylinders
  • Compression: cylinder 2 static compression should be within ~10-15% of other cylinders (typical >90 psi / 620 kPa, check vehicle spec)
  • Fuel rail pressure: must meet manufacturer specification under no-load and loaded conditions

Diagnostic algorithm

  1. Connect a scan tool, record freeze-frame and live data (misfire counters, RPM, load, fuel trims, injector pulse).
  2. Clear codes and perform a monitored test drive to confirm P1302 returns and note operating conditions when it appears.
  3. Swap the ignition coil from cylinder 2 with a known-good coil on another cylinder. Re-test; if misfire follows coil, replace the coil.
  4. Inspect and/or replace the spark plug on cylinder 2. Re-test for misfire.
  5. Swap the fuel injector with another cylinder or perform an injector flow/activation test. Replace injector if faulty.
  6. Check fuel pressure and regulator operation to rule out fuel delivery problems.
  7. Perform compression and/or leak-down test on cylinder 2 and compare to others. If low, investigate valves, rings, or head gasket.
  8. Inspect wiring, connectors, and grounds for the coil and injector on cylinder 2. Repair any damaged wiring or poor connections.
  9. Check for intake manifold leaks or vacuum leaks near cylinder 2 that could cause a lean misfire.
  10. If electrical and mechanical checks pass, consider PCM/sensor diagnosis (crank/cam sensors) or consult manufacturer service information for model-specific tests.
  11. Note: Follow vehicle service manual safety procedures and specifications. Replace only failed components after confirming with comparative tests.

Likely causes

  • Ignition coil failure or intermittent coil driver for cylinder 2
  • Bad or fouled spark plug in cylinder 2
  • Clogged or electrically faulty fuel injector for cylinder 2
  • Low compression or mechanical fault specific to cylinder 2
  • Wiring harness/connector corrosion or short to cylinder 2 components

Fault status

⚠️ Status
P1302 - Cylinder 2 Misfire detected by PCM. Misfire count threshold exceeded for cylinder 2; check ignition, fuel, compression, and associated wiring/connectors.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.5 hours

Similar codes

P0302 P0300 P0301 P0303 P0304 P0305
Repair manuals

Manual library for DAEWOO

75

Browse 75 DAEWOO manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

DAEWOO

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Code

P1302

FORD P — Powertrain

Boost Calibration Low

Brand: FORD
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty ignition coil on cylinder 2
  • Worn or fouled spark plug in cylinder 2
  • Restricted or leaking fuel injector for cylinder 2
  • Low compression (worn rings, burned valve, head gasket leak)
  • Open/short in wiring or poor connector to coil/injector
  • Vacuum or intake leak affecting cylinder 2

Symptoms

  • Check Engine Light (MIL) on
  • Engine rough idle or vibration
  • Loss of power or hesitation on acceleration
  • Poor fuel economy and higher emissions
  • Possible misfire-related codes or misfire count for cylinder 2
  • Occasional bucking or stalling at idle/low load

What to check

  • Read stored/active DTCs and freeze-frame data with a scan tool. Note misfire counts and operating conditions.
  • Check for pending P0302 (generic cylinder 2 misfire) and related codes (fuel trim, O2 sensors).
  • Visually inspect ignition coil, spark plug, injector connector and wiring for damage or corrosion.
  • Swap ignition coil (or coil-on-plug) from cylinder 2 with another cylinder to see if misfire follows the coil.
  • Swap fuel injector or use an injector balance test to confirm injector flow on cylinder 2.
  • Measure fuel rail pressure to confirm correct system pressure.

Signal parameters

  • Misfire counter: non-zero events for cylinder 2 (as reported by PCM)
  • Short-term/long-term fuel trim (STFT/LTFT): deviations > +/-10% may indicate fueling issue
  • Injector pulse width: compare cylinder 2 pulse (ms) to other cylinders at same conditions
  • Coil primary/secondary resistance: compare to service specs (values vary by model) and to other cylinders
  • Compression: cylinder 2 static compression should be within ~10-15% of other cylinders (typical >90 psi / 620 kPa, check vehicle spec)
  • Fuel rail pressure: must meet manufacturer specification under no-load and loaded conditions

Diagnostic algorithm

  1. Connect a scan tool, record freeze-frame and live data (misfire counters, RPM, load, fuel trims, injector pulse).
  2. Clear codes and perform a monitored test drive to confirm P1302 returns and note operating conditions when it appears.
  3. Swap the ignition coil from cylinder 2 with a known-good coil on another cylinder. Re-test; if misfire follows coil, replace the coil.
  4. Inspect and/or replace the spark plug on cylinder 2. Re-test for misfire.
  5. Swap the fuel injector with another cylinder or perform an injector flow/activation test. Replace injector if faulty.
  6. Check fuel pressure and regulator operation to rule out fuel delivery problems.
  7. Perform compression and/or leak-down test on cylinder 2 and compare to others. If low, investigate valves, rings, or head gasket.
  8. Inspect wiring, connectors, and grounds for the coil and injector on cylinder 2. Repair any damaged wiring or poor connections.
  9. Check for intake manifold leaks or vacuum leaks near cylinder 2 that could cause a lean misfire.
  10. If electrical and mechanical checks pass, consider PCM/sensor diagnosis (crank/cam sensors) or consult manufacturer service information for model-specific tests.
  11. Note: Follow vehicle service manual safety procedures and specifications. Replace only failed components after confirming with comparative tests.

Likely causes

  • Ignition coil failure or intermittent coil driver for cylinder 2
  • Bad or fouled spark plug in cylinder 2
  • Clogged or electrically faulty fuel injector for cylinder 2
  • Low compression or mechanical fault specific to cylinder 2
  • Wiring harness/connector corrosion or short to cylinder 2 components

Fault status

⚠️ Status
P1302 - Cylinder 2 Misfire detected by PCM. Misfire count threshold exceeded for cylinder 2; check ignition, fuel, compression, and associated wiring/connectors.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.5 hours

Similar codes

P0302 P0300 P0301 P0303 P0304 P0305
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Keep it short and practical. Up to 500 characters.
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Code

P1302

HONDA P — Powertrain

Cylinder 2 Misfire

Brand: HONDA
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty ignition coil on cylinder 2
  • Worn or fouled spark plug in cylinder 2
  • Restricted or leaking fuel injector for cylinder 2
  • Low compression (worn rings, burned valve, head gasket leak)
  • Open/short in wiring or poor connector to coil/injector
  • Vacuum or intake leak affecting cylinder 2

Symptoms

  • Check Engine Light (MIL) on
  • Engine rough idle or vibration
  • Loss of power or hesitation on acceleration
  • Poor fuel economy and higher emissions
  • Possible misfire-related codes or misfire count for cylinder 2
  • Occasional bucking or stalling at idle/low load

What to check

  • Read stored/active DTCs and freeze-frame data with a scan tool. Note misfire counts and operating conditions.
  • Check for pending P0302 (generic cylinder 2 misfire) and related codes (fuel trim, O2 sensors).
  • Visually inspect ignition coil, spark plug, injector connector and wiring for damage or corrosion.
  • Swap ignition coil (or coil-on-plug) from cylinder 2 with another cylinder to see if misfire follows the coil.
  • Swap fuel injector or use an injector balance test to confirm injector flow on cylinder 2.
  • Measure fuel rail pressure to confirm correct system pressure.

Signal parameters

  • Misfire counter: non-zero events for cylinder 2 (as reported by PCM)
  • Short-term/long-term fuel trim (STFT/LTFT): deviations > +/-10% may indicate fueling issue
  • Injector pulse width: compare cylinder 2 pulse (ms) to other cylinders at same conditions
  • Coil primary/secondary resistance: compare to service specs (values vary by model) and to other cylinders
  • Compression: cylinder 2 static compression should be within ~10-15% of other cylinders (typical >90 psi / 620 kPa, check vehicle spec)
  • Fuel rail pressure: must meet manufacturer specification under no-load and loaded conditions

Diagnostic algorithm

  1. Connect a scan tool, record freeze-frame and live data (misfire counters, RPM, load, fuel trims, injector pulse).
  2. Clear codes and perform a monitored test drive to confirm P1302 returns and note operating conditions when it appears.
  3. Swap the ignition coil from cylinder 2 with a known-good coil on another cylinder. Re-test; if misfire follows coil, replace the coil.
  4. Inspect and/or replace the spark plug on cylinder 2. Re-test for misfire.
  5. Swap the fuel injector with another cylinder or perform an injector flow/activation test. Replace injector if faulty.
  6. Check fuel pressure and regulator operation to rule out fuel delivery problems.
  7. Perform compression and/or leak-down test on cylinder 2 and compare to others. If low, investigate valves, rings, or head gasket.
  8. Inspect wiring, connectors, and grounds for the coil and injector on cylinder 2. Repair any damaged wiring or poor connections.
  9. Check for intake manifold leaks or vacuum leaks near cylinder 2 that could cause a lean misfire.
  10. If electrical and mechanical checks pass, consider PCM/sensor diagnosis (crank/cam sensors) or consult manufacturer service information for model-specific tests.
  11. Note: Follow vehicle service manual safety procedures and specifications. Replace only failed components after confirming with comparative tests.

Likely causes

  • Ignition coil failure or intermittent coil driver for cylinder 2
  • Bad or fouled spark plug in cylinder 2
  • Clogged or electrically faulty fuel injector for cylinder 2
  • Low compression or mechanical fault specific to cylinder 2
  • Wiring harness/connector corrosion or short to cylinder 2 components

Fault status

⚠️ Status
P1302 - Cylinder 2 Misfire detected by PCM. Misfire count threshold exceeded for cylinder 2; check ignition, fuel, compression, and associated wiring/connectors.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.5 hours

Similar codes

P0302 P0300 P0301 P0303 P0304 P0305
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1302

INFINITI P — Powertrain

Cylinder 2 Misfire

Brand: INFINITI
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty ignition coil on cylinder 2
  • Worn or fouled spark plug in cylinder 2
  • Restricted or leaking fuel injector for cylinder 2
  • Low compression (worn rings, burned valve, head gasket leak)
  • Open/short in wiring or poor connector to coil/injector
  • Vacuum or intake leak affecting cylinder 2

Symptoms

  • Check Engine Light (MIL) on
  • Engine rough idle or vibration
  • Loss of power or hesitation on acceleration
  • Poor fuel economy and higher emissions
  • Possible misfire-related codes or misfire count for cylinder 2
  • Occasional bucking or stalling at idle/low load

What to check

  • Read stored/active DTCs and freeze-frame data with a scan tool. Note misfire counts and operating conditions.
  • Check for pending P0302 (generic cylinder 2 misfire) and related codes (fuel trim, O2 sensors).
  • Visually inspect ignition coil, spark plug, injector connector and wiring for damage or corrosion.
  • Swap ignition coil (or coil-on-plug) from cylinder 2 with another cylinder to see if misfire follows the coil.
  • Swap fuel injector or use an injector balance test to confirm injector flow on cylinder 2.
  • Measure fuel rail pressure to confirm correct system pressure.

Signal parameters

  • Misfire counter: non-zero events for cylinder 2 (as reported by PCM)
  • Short-term/long-term fuel trim (STFT/LTFT): deviations > +/-10% may indicate fueling issue
  • Injector pulse width: compare cylinder 2 pulse (ms) to other cylinders at same conditions
  • Coil primary/secondary resistance: compare to service specs (values vary by model) and to other cylinders
  • Compression: cylinder 2 static compression should be within ~10-15% of other cylinders (typical >90 psi / 620 kPa, check vehicle spec)
  • Fuel rail pressure: must meet manufacturer specification under no-load and loaded conditions

Diagnostic algorithm

  1. Connect a scan tool, record freeze-frame and live data (misfire counters, RPM, load, fuel trims, injector pulse).
  2. Clear codes and perform a monitored test drive to confirm P1302 returns and note operating conditions when it appears.
  3. Swap the ignition coil from cylinder 2 with a known-good coil on another cylinder. Re-test; if misfire follows coil, replace the coil.
  4. Inspect and/or replace the spark plug on cylinder 2. Re-test for misfire.
  5. Swap the fuel injector with another cylinder or perform an injector flow/activation test. Replace injector if faulty.
  6. Check fuel pressure and regulator operation to rule out fuel delivery problems.
  7. Perform compression and/or leak-down test on cylinder 2 and compare to others. If low, investigate valves, rings, or head gasket.
  8. Inspect wiring, connectors, and grounds for the coil and injector on cylinder 2. Repair any damaged wiring or poor connections.
  9. Check for intake manifold leaks or vacuum leaks near cylinder 2 that could cause a lean misfire.
  10. If electrical and mechanical checks pass, consider PCM/sensor diagnosis (crank/cam sensors) or consult manufacturer service information for model-specific tests.
  11. Note: Follow vehicle service manual safety procedures and specifications. Replace only failed components after confirming with comparative tests.

Likely causes

  • Ignition coil failure or intermittent coil driver for cylinder 2
  • Bad or fouled spark plug in cylinder 2
  • Clogged or electrically faulty fuel injector for cylinder 2
  • Low compression or mechanical fault specific to cylinder 2
  • Wiring harness/connector corrosion or short to cylinder 2 components

Fault status

⚠️ Status
P1302 - Cylinder 2 Misfire detected by PCM. Misfire count threshold exceeded for cylinder 2; check ignition, fuel, compression, and associated wiring/connectors.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.5 hours

Similar codes

P0302 P0300 P0301 P0303 P0304 P0305
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1302

LINCOLN P — Powertrain

Boost Calibration Low

Brand: LINCOLN
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty ignition coil on cylinder 2
  • Worn or fouled spark plug in cylinder 2
  • Restricted or leaking fuel injector for cylinder 2
  • Low compression (worn rings, burned valve, head gasket leak)
  • Open/short in wiring or poor connector to coil/injector
  • Vacuum or intake leak affecting cylinder 2

Symptoms

  • Check Engine Light (MIL) on
  • Engine rough idle or vibration
  • Loss of power or hesitation on acceleration
  • Poor fuel economy and higher emissions
  • Possible misfire-related codes or misfire count for cylinder 2
  • Occasional bucking or stalling at idle/low load

What to check

  • Read stored/active DTCs and freeze-frame data with a scan tool. Note misfire counts and operating conditions.
  • Check for pending P0302 (generic cylinder 2 misfire) and related codes (fuel trim, O2 sensors).
  • Visually inspect ignition coil, spark plug, injector connector and wiring for damage or corrosion.
  • Swap ignition coil (or coil-on-plug) from cylinder 2 with another cylinder to see if misfire follows the coil.
  • Swap fuel injector or use an injector balance test to confirm injector flow on cylinder 2.
  • Measure fuel rail pressure to confirm correct system pressure.

Signal parameters

  • Misfire counter: non-zero events for cylinder 2 (as reported by PCM)
  • Short-term/long-term fuel trim (STFT/LTFT): deviations > +/-10% may indicate fueling issue
  • Injector pulse width: compare cylinder 2 pulse (ms) to other cylinders at same conditions
  • Coil primary/secondary resistance: compare to service specs (values vary by model) and to other cylinders
  • Compression: cylinder 2 static compression should be within ~10-15% of other cylinders (typical >90 psi / 620 kPa, check vehicle spec)
  • Fuel rail pressure: must meet manufacturer specification under no-load and loaded conditions

Diagnostic algorithm

  1. Connect a scan tool, record freeze-frame and live data (misfire counters, RPM, load, fuel trims, injector pulse).
  2. Clear codes and perform a monitored test drive to confirm P1302 returns and note operating conditions when it appears.
  3. Swap the ignition coil from cylinder 2 with a known-good coil on another cylinder. Re-test; if misfire follows coil, replace the coil.
  4. Inspect and/or replace the spark plug on cylinder 2. Re-test for misfire.
  5. Swap the fuel injector with another cylinder or perform an injector flow/activation test. Replace injector if faulty.
  6. Check fuel pressure and regulator operation to rule out fuel delivery problems.
  7. Perform compression and/or leak-down test on cylinder 2 and compare to others. If low, investigate valves, rings, or head gasket.
  8. Inspect wiring, connectors, and grounds for the coil and injector on cylinder 2. Repair any damaged wiring or poor connections.
  9. Check for intake manifold leaks or vacuum leaks near cylinder 2 that could cause a lean misfire.
  10. If electrical and mechanical checks pass, consider PCM/sensor diagnosis (crank/cam sensors) or consult manufacturer service information for model-specific tests.
  11. Note: Follow vehicle service manual safety procedures and specifications. Replace only failed components after confirming with comparative tests.

Likely causes

  • Ignition coil failure or intermittent coil driver for cylinder 2
  • Bad or fouled spark plug in cylinder 2
  • Clogged or electrically faulty fuel injector for cylinder 2
  • Low compression or mechanical fault specific to cylinder 2
  • Wiring harness/connector corrosion or short to cylinder 2 components

Fault status

⚠️ Status
P1302 - Cylinder 2 Misfire detected by PCM. Misfire count threshold exceeded for cylinder 2; check ignition, fuel, compression, and associated wiring/connectors.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.5 hours

Similar codes

P0302 P0300 P0301 P0303 P0304 P0305
166

Browse 166 LINCOLN manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LINCOLN

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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Code

P1302

MERCURY P — Powertrain

Boost Calibration Low

Brand: MERCURY
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty ignition coil on cylinder 2
  • Worn or fouled spark plug in cylinder 2
  • Restricted or leaking fuel injector for cylinder 2
  • Low compression (worn rings, burned valve, head gasket leak)
  • Open/short in wiring or poor connector to coil/injector
  • Vacuum or intake leak affecting cylinder 2

Symptoms

  • Check Engine Light (MIL) on
  • Engine rough idle or vibration
  • Loss of power or hesitation on acceleration
  • Poor fuel economy and higher emissions
  • Possible misfire-related codes or misfire count for cylinder 2
  • Occasional bucking or stalling at idle/low load

What to check

  • Read stored/active DTCs and freeze-frame data with a scan tool. Note misfire counts and operating conditions.
  • Check for pending P0302 (generic cylinder 2 misfire) and related codes (fuel trim, O2 sensors).
  • Visually inspect ignition coil, spark plug, injector connector and wiring for damage or corrosion.
  • Swap ignition coil (or coil-on-plug) from cylinder 2 with another cylinder to see if misfire follows the coil.
  • Swap fuel injector or use an injector balance test to confirm injector flow on cylinder 2.
  • Measure fuel rail pressure to confirm correct system pressure.

Signal parameters

  • Misfire counter: non-zero events for cylinder 2 (as reported by PCM)
  • Short-term/long-term fuel trim (STFT/LTFT): deviations > +/-10% may indicate fueling issue
  • Injector pulse width: compare cylinder 2 pulse (ms) to other cylinders at same conditions
  • Coil primary/secondary resistance: compare to service specs (values vary by model) and to other cylinders
  • Compression: cylinder 2 static compression should be within ~10-15% of other cylinders (typical >90 psi / 620 kPa, check vehicle spec)
  • Fuel rail pressure: must meet manufacturer specification under no-load and loaded conditions

Diagnostic algorithm

  1. Connect a scan tool, record freeze-frame and live data (misfire counters, RPM, load, fuel trims, injector pulse).
  2. Clear codes and perform a monitored test drive to confirm P1302 returns and note operating conditions when it appears.
  3. Swap the ignition coil from cylinder 2 with a known-good coil on another cylinder. Re-test; if misfire follows coil, replace the coil.
  4. Inspect and/or replace the spark plug on cylinder 2. Re-test for misfire.
  5. Swap the fuel injector with another cylinder or perform an injector flow/activation test. Replace injector if faulty.
  6. Check fuel pressure and regulator operation to rule out fuel delivery problems.
  7. Perform compression and/or leak-down test on cylinder 2 and compare to others. If low, investigate valves, rings, or head gasket.
  8. Inspect wiring, connectors, and grounds for the coil and injector on cylinder 2. Repair any damaged wiring or poor connections.
  9. Check for intake manifold leaks or vacuum leaks near cylinder 2 that could cause a lean misfire.
  10. If electrical and mechanical checks pass, consider PCM/sensor diagnosis (crank/cam sensors) or consult manufacturer service information for model-specific tests.
  11. Note: Follow vehicle service manual safety procedures and specifications. Replace only failed components after confirming with comparative tests.

Likely causes

  • Ignition coil failure or intermittent coil driver for cylinder 2
  • Bad or fouled spark plug in cylinder 2
  • Clogged or electrically faulty fuel injector for cylinder 2
  • Low compression or mechanical fault specific to cylinder 2
  • Wiring harness/connector corrosion or short to cylinder 2 components

Fault status

⚠️ Status
P1302 - Cylinder 2 Misfire detected by PCM. Misfire count threshold exceeded for cylinder 2; check ignition, fuel, compression, and associated wiring/connectors.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.5 hours

Similar codes

P0302 P0300 P0301 P0303 P0304 P0305
296

Browse 296 MERCURY manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MERCURY

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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Code

P1302

Other P — Powertrain

Boost Calibration Low

Brand: Other
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty ignition coil on cylinder 2
  • Worn or fouled spark plug in cylinder 2
  • Restricted or leaking fuel injector for cylinder 2
  • Low compression (worn rings, burned valve, head gasket leak)
  • Open/short in wiring or poor connector to coil/injector
  • Vacuum or intake leak affecting cylinder 2

Symptoms

  • Check Engine Light (MIL) on
  • Engine rough idle or vibration
  • Loss of power or hesitation on acceleration
  • Poor fuel economy and higher emissions
  • Possible misfire-related codes or misfire count for cylinder 2
  • Occasional bucking or stalling at idle/low load

What to check

  • Read stored/active DTCs and freeze-frame data with a scan tool. Note misfire counts and operating conditions.
  • Check for pending P0302 (generic cylinder 2 misfire) and related codes (fuel trim, O2 sensors).
  • Visually inspect ignition coil, spark plug, injector connector and wiring for damage or corrosion.
  • Swap ignition coil (or coil-on-plug) from cylinder 2 with another cylinder to see if misfire follows the coil.
  • Swap fuel injector or use an injector balance test to confirm injector flow on cylinder 2.
  • Measure fuel rail pressure to confirm correct system pressure.

Signal parameters

  • Misfire counter: non-zero events for cylinder 2 (as reported by PCM)
  • Short-term/long-term fuel trim (STFT/LTFT): deviations > +/-10% may indicate fueling issue
  • Injector pulse width: compare cylinder 2 pulse (ms) to other cylinders at same conditions
  • Coil primary/secondary resistance: compare to service specs (values vary by model) and to other cylinders
  • Compression: cylinder 2 static compression should be within ~10-15% of other cylinders (typical >90 psi / 620 kPa, check vehicle spec)
  • Fuel rail pressure: must meet manufacturer specification under no-load and loaded conditions

Diagnostic algorithm

  1. Connect a scan tool, record freeze-frame and live data (misfire counters, RPM, load, fuel trims, injector pulse).
  2. Clear codes and perform a monitored test drive to confirm P1302 returns and note operating conditions when it appears.
  3. Swap the ignition coil from cylinder 2 with a known-good coil on another cylinder. Re-test; if misfire follows coil, replace the coil.
  4. Inspect and/or replace the spark plug on cylinder 2. Re-test for misfire.
  5. Swap the fuel injector with another cylinder or perform an injector flow/activation test. Replace injector if faulty.
  6. Check fuel pressure and regulator operation to rule out fuel delivery problems.
  7. Perform compression and/or leak-down test on cylinder 2 and compare to others. If low, investigate valves, rings, or head gasket.
  8. Inspect wiring, connectors, and grounds for the coil and injector on cylinder 2. Repair any damaged wiring or poor connections.
  9. Check for intake manifold leaks or vacuum leaks near cylinder 2 that could cause a lean misfire.
  10. If electrical and mechanical checks pass, consider PCM/sensor diagnosis (crank/cam sensors) or consult manufacturer service information for model-specific tests.
  11. Note: Follow vehicle service manual safety procedures and specifications. Replace only failed components after confirming with comparative tests.

Likely causes

  • Ignition coil failure or intermittent coil driver for cylinder 2
  • Bad or fouled spark plug in cylinder 2
  • Clogged or electrically faulty fuel injector for cylinder 2
  • Low compression or mechanical fault specific to cylinder 2
  • Wiring harness/connector corrosion or short to cylinder 2 components

Fault status

⚠️ Status
P1302 - Cylinder 2 Misfire detected by PCM. Misfire count threshold exceeded for cylinder 2; check ignition, fuel, compression, and associated wiring/connectors.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.5 hours

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P0302 P0300 P0301 P0303 P0304 P0305
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Code

P1302

SAAB P — Powertrain

Cylinder 2 Misfire Detected. Catalyst Damaging.

Brand: SAAB
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty ignition coil on cylinder 2
  • Worn or fouled spark plug in cylinder 2
  • Restricted or leaking fuel injector for cylinder 2
  • Low compression (worn rings, burned valve, head gasket leak)
  • Open/short in wiring or poor connector to coil/injector
  • Vacuum or intake leak affecting cylinder 2

Symptoms

  • Check Engine Light (MIL) on
  • Engine rough idle or vibration
  • Loss of power or hesitation on acceleration
  • Poor fuel economy and higher emissions
  • Possible misfire-related codes or misfire count for cylinder 2
  • Occasional bucking or stalling at idle/low load

What to check

  • Read stored/active DTCs and freeze-frame data with a scan tool. Note misfire counts and operating conditions.
  • Check for pending P0302 (generic cylinder 2 misfire) and related codes (fuel trim, O2 sensors).
  • Visually inspect ignition coil, spark plug, injector connector and wiring for damage or corrosion.
  • Swap ignition coil (or coil-on-plug) from cylinder 2 with another cylinder to see if misfire follows the coil.
  • Swap fuel injector or use an injector balance test to confirm injector flow on cylinder 2.
  • Measure fuel rail pressure to confirm correct system pressure.

Signal parameters

  • Misfire counter: non-zero events for cylinder 2 (as reported by PCM)
  • Short-term/long-term fuel trim (STFT/LTFT): deviations > +/-10% may indicate fueling issue
  • Injector pulse width: compare cylinder 2 pulse (ms) to other cylinders at same conditions
  • Coil primary/secondary resistance: compare to service specs (values vary by model) and to other cylinders
  • Compression: cylinder 2 static compression should be within ~10-15% of other cylinders (typical >90 psi / 620 kPa, check vehicle spec)
  • Fuel rail pressure: must meet manufacturer specification under no-load and loaded conditions

Diagnostic algorithm

  1. Connect a scan tool, record freeze-frame and live data (misfire counters, RPM, load, fuel trims, injector pulse).
  2. Clear codes and perform a monitored test drive to confirm P1302 returns and note operating conditions when it appears.
  3. Swap the ignition coil from cylinder 2 with a known-good coil on another cylinder. Re-test; if misfire follows coil, replace the coil.
  4. Inspect and/or replace the spark plug on cylinder 2. Re-test for misfire.
  5. Swap the fuel injector with another cylinder or perform an injector flow/activation test. Replace injector if faulty.
  6. Check fuel pressure and regulator operation to rule out fuel delivery problems.
  7. Perform compression and/or leak-down test on cylinder 2 and compare to others. If low, investigate valves, rings, or head gasket.
  8. Inspect wiring, connectors, and grounds for the coil and injector on cylinder 2. Repair any damaged wiring or poor connections.
  9. Check for intake manifold leaks or vacuum leaks near cylinder 2 that could cause a lean misfire.
  10. If electrical and mechanical checks pass, consider PCM/sensor diagnosis (crank/cam sensors) or consult manufacturer service information for model-specific tests.
  11. Note: Follow vehicle service manual safety procedures and specifications. Replace only failed components after confirming with comparative tests.

Likely causes

  • Ignition coil failure or intermittent coil driver for cylinder 2
  • Bad or fouled spark plug in cylinder 2
  • Clogged or electrically faulty fuel injector for cylinder 2
  • Low compression or mechanical fault specific to cylinder 2
  • Wiring harness/connector corrosion or short to cylinder 2 components

Fault status

⚠️ Status
P1302 - Cylinder 2 Misfire detected by PCM. Misfire count threshold exceeded for cylinder 2; check ignition, fuel, compression, and associated wiring/connectors.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.5 hours

Similar codes

P0302 P0300 P0301 P0303 P0304 P0305
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

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