Code
P1302
ACURA
P — Powertrain
Cylinder 2 Misfire
Views:
UK: 15
EN: 43
RU: 35
AI status
Completed
Completed
100%
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
- Connect a scan tool, record freeze-frame and live data (misfire counters, RPM, load, fuel trims, injector pulse).
- Clear codes and perform a monitored test drive to confirm P1302 returns and note operating conditions when it appears.
- Swap the ignition coil from cylinder 2 with a known-good coil on another cylinder. Re-test; if misfire follows coil, replace the coil.
- Inspect and/or replace the spark plug on cylinder 2. Re-test for misfire.
- Swap the fuel injector with another cylinder or perform an injector flow/activation test. Replace injector if faulty.
- Check fuel pressure and regulator operation to rule out fuel delivery problems.
- Perform compression and/or leak-down test on cylinder 2 and compare to others. If low, investigate valves, rings, or head gasket.
- Inspect wiring, connectors, and grounds for the coil and injector on cylinder 2. Repair any damaged wiring or poor connections.
- Check for intake manifold leaks or vacuum leaks near cylinder 2 that could cause a lean misfire.
- If electrical and mechanical checks pass, consider PCM/sensor diagnosis (crank/cam sensors) or consult manufacturer service information for model-specific tests.
- 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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Code
P1302
DAEWOO
P — Powertrain
TDC SNSR - SIGNAL LOW
Views:
UK: 1
EN: 9
RU: 11
AI status
Completed
Completed
100%
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
- Connect a scan tool, record freeze-frame and live data (misfire counters, RPM, load, fuel trims, injector pulse).
- Clear codes and perform a monitored test drive to confirm P1302 returns and note operating conditions when it appears.
- Swap the ignition coil from cylinder 2 with a known-good coil on another cylinder. Re-test; if misfire follows coil, replace the coil.
- Inspect and/or replace the spark plug on cylinder 2. Re-test for misfire.
- Swap the fuel injector with another cylinder or perform an injector flow/activation test. Replace injector if faulty.
- Check fuel pressure and regulator operation to rule out fuel delivery problems.
- Perform compression and/or leak-down test on cylinder 2 and compare to others. If low, investigate valves, rings, or head gasket.
- Inspect wiring, connectors, and grounds for the coil and injector on cylinder 2. Repair any damaged wiring or poor connections.
- Check for intake manifold leaks or vacuum leaks near cylinder 2 that could cause a lean misfire.
- If electrical and mechanical checks pass, consider PCM/sensor diagnosis (crank/cam sensors) or consult manufacturer service information for model-specific tests.
- 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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Code
P1302
FORD
P — Powertrain
Boost Calibration Low
Views:
UK: 11
EN: 34
RU: 33
AI status
Completed
Completed
100%
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
- Connect a scan tool, record freeze-frame and live data (misfire counters, RPM, load, fuel trims, injector pulse).
- Clear codes and perform a monitored test drive to confirm P1302 returns and note operating conditions when it appears.
- Swap the ignition coil from cylinder 2 with a known-good coil on another cylinder. Re-test; if misfire follows coil, replace the coil.
- Inspect and/or replace the spark plug on cylinder 2. Re-test for misfire.
- Swap the fuel injector with another cylinder or perform an injector flow/activation test. Replace injector if faulty.
- Check fuel pressure and regulator operation to rule out fuel delivery problems.
- Perform compression and/or leak-down test on cylinder 2 and compare to others. If low, investigate valves, rings, or head gasket.
- Inspect wiring, connectors, and grounds for the coil and injector on cylinder 2. Repair any damaged wiring or poor connections.
- Check for intake manifold leaks or vacuum leaks near cylinder 2 that could cause a lean misfire.
- If electrical and mechanical checks pass, consider PCM/sensor diagnosis (crank/cam sensors) or consult manufacturer service information for model-specific tests.
- 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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Code
P1302
HONDA
P — Powertrain
Cylinder 2 Misfire
Views:
UK: 12
EN: 37
RU: 35
AI status
Completed
Completed
100%
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
- Connect a scan tool, record freeze-frame and live data (misfire counters, RPM, load, fuel trims, injector pulse).
- Clear codes and perform a monitored test drive to confirm P1302 returns and note operating conditions when it appears.
- Swap the ignition coil from cylinder 2 with a known-good coil on another cylinder. Re-test; if misfire follows coil, replace the coil.
- Inspect and/or replace the spark plug on cylinder 2. Re-test for misfire.
- Swap the fuel injector with another cylinder or perform an injector flow/activation test. Replace injector if faulty.
- Check fuel pressure and regulator operation to rule out fuel delivery problems.
- Perform compression and/or leak-down test on cylinder 2 and compare to others. If low, investigate valves, rings, or head gasket.
- Inspect wiring, connectors, and grounds for the coil and injector on cylinder 2. Repair any damaged wiring or poor connections.
- Check for intake manifold leaks or vacuum leaks near cylinder 2 that could cause a lean misfire.
- If electrical and mechanical checks pass, consider PCM/sensor diagnosis (crank/cam sensors) or consult manufacturer service information for model-specific tests.
- 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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Code
P1302
INFINITI
P — Powertrain
Cylinder 2 Misfire
Views:
UK: 13
EN: 36
RU: 34
AI status
Completed
Completed
100%
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
- Connect a scan tool, record freeze-frame and live data (misfire counters, RPM, load, fuel trims, injector pulse).
- Clear codes and perform a monitored test drive to confirm P1302 returns and note operating conditions when it appears.
- Swap the ignition coil from cylinder 2 with a known-good coil on another cylinder. Re-test; if misfire follows coil, replace the coil.
- Inspect and/or replace the spark plug on cylinder 2. Re-test for misfire.
- Swap the fuel injector with another cylinder or perform an injector flow/activation test. Replace injector if faulty.
- Check fuel pressure and regulator operation to rule out fuel delivery problems.
- Perform compression and/or leak-down test on cylinder 2 and compare to others. If low, investigate valves, rings, or head gasket.
- Inspect wiring, connectors, and grounds for the coil and injector on cylinder 2. Repair any damaged wiring or poor connections.
- Check for intake manifold leaks or vacuum leaks near cylinder 2 that could cause a lean misfire.
- If electrical and mechanical checks pass, consider PCM/sensor diagnosis (crank/cam sensors) or consult manufacturer service information for model-specific tests.
- 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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Code
P1302
LINCOLN
P — Powertrain
Boost Calibration Low
Views:
UK: 12
EN: 36
RU: 33
AI status
Completed
Completed
100%
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
- Connect a scan tool, record freeze-frame and live data (misfire counters, RPM, load, fuel trims, injector pulse).
- Clear codes and perform a monitored test drive to confirm P1302 returns and note operating conditions when it appears.
- Swap the ignition coil from cylinder 2 with a known-good coil on another cylinder. Re-test; if misfire follows coil, replace the coil.
- Inspect and/or replace the spark plug on cylinder 2. Re-test for misfire.
- Swap the fuel injector with another cylinder or perform an injector flow/activation test. Replace injector if faulty.
- Check fuel pressure and regulator operation to rule out fuel delivery problems.
- Perform compression and/or leak-down test on cylinder 2 and compare to others. If low, investigate valves, rings, or head gasket.
- Inspect wiring, connectors, and grounds for the coil and injector on cylinder 2. Repair any damaged wiring or poor connections.
- Check for intake manifold leaks or vacuum leaks near cylinder 2 that could cause a lean misfire.
- If electrical and mechanical checks pass, consider PCM/sensor diagnosis (crank/cam sensors) or consult manufacturer service information for model-specific tests.
- 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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Code
P1302
MERCURY
P — Powertrain
Boost Calibration Low
Views:
UK: 12
EN: 42
RU: 37
AI status
Completed
Completed
100%
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
- Connect a scan tool, record freeze-frame and live data (misfire counters, RPM, load, fuel trims, injector pulse).
- Clear codes and perform a monitored test drive to confirm P1302 returns and note operating conditions when it appears.
- Swap the ignition coil from cylinder 2 with a known-good coil on another cylinder. Re-test; if misfire follows coil, replace the coil.
- Inspect and/or replace the spark plug on cylinder 2. Re-test for misfire.
- Swap the fuel injector with another cylinder or perform an injector flow/activation test. Replace injector if faulty.
- Check fuel pressure and regulator operation to rule out fuel delivery problems.
- Perform compression and/or leak-down test on cylinder 2 and compare to others. If low, investigate valves, rings, or head gasket.
- Inspect wiring, connectors, and grounds for the coil and injector on cylinder 2. Repair any damaged wiring or poor connections.
- Check for intake manifold leaks or vacuum leaks near cylinder 2 that could cause a lean misfire.
- If electrical and mechanical checks pass, consider PCM/sensor diagnosis (crank/cam sensors) or consult manufacturer service information for model-specific tests.
- 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
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Code
P1302
Other
P — Powertrain
Boost Calibration Low
Views:
UK: 21
EN: 38
RU: 40
AI status
Completed
Completed
100%
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
- Connect a scan tool, record freeze-frame and live data (misfire counters, RPM, load, fuel trims, injector pulse).
- Clear codes and perform a monitored test drive to confirm P1302 returns and note operating conditions when it appears.
- Swap the ignition coil from cylinder 2 with a known-good coil on another cylinder. Re-test; if misfire follows coil, replace the coil.
- Inspect and/or replace the spark plug on cylinder 2. Re-test for misfire.
- Swap the fuel injector with another cylinder or perform an injector flow/activation test. Replace injector if faulty.
- Check fuel pressure and regulator operation to rule out fuel delivery problems.
- Perform compression and/or leak-down test on cylinder 2 and compare to others. If low, investigate valves, rings, or head gasket.
- Inspect wiring, connectors, and grounds for the coil and injector on cylinder 2. Repair any damaged wiring or poor connections.
- Check for intake manifold leaks or vacuum leaks near cylinder 2 that could cause a lean misfire.
- If electrical and mechanical checks pass, consider PCM/sensor diagnosis (crank/cam sensors) or consult manufacturer service information for model-specific tests.
- 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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Code
P1302
SAAB
P — Powertrain
Cylinder 2 Misfire Detected. Catalyst Damaging.
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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
- Connect a scan tool, record freeze-frame and live data (misfire counters, RPM, load, fuel trims, injector pulse).
- Clear codes and perform a monitored test drive to confirm P1302 returns and note operating conditions when it appears.
- Swap the ignition coil from cylinder 2 with a known-good coil on another cylinder. Re-test; if misfire follows coil, replace the coil.
- Inspect and/or replace the spark plug on cylinder 2. Re-test for misfire.
- Swap the fuel injector with another cylinder or perform an injector flow/activation test. Replace injector if faulty.
- Check fuel pressure and regulator operation to rule out fuel delivery problems.
- Perform compression and/or leak-down test on cylinder 2 and compare to others. If low, investigate valves, rings, or head gasket.
- Inspect wiring, connectors, and grounds for the coil and injector on cylinder 2. Repair any damaged wiring or poor connections.
- Check for intake manifold leaks or vacuum leaks near cylinder 2 that could cause a lean misfire.
- If electrical and mechanical checks pass, consider PCM/sensor diagnosis (crank/cam sensors) or consult manufacturer service information for model-specific tests.
- 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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