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Home / DTC / P02A0 — Cylinder 2 - Injector Restricted

P02A0 — Cylinder 2 - Injector Restricted

Detailed page for trouble code P02A0.

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Code

P02A0

Generic P — Powertrain

Cylinder 2 - Injector Restricted

Brand: Generic
Type: P — Powertrain
Views: UK: 26 EN: 70 RU: 39
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Clogged or partially blocked injector nozzle or inlet screen
  • Contaminated fuel (debris, varnish, water, or particulates)
  • Collapsed or restricted fuel supply line or rail feed to cylinder 2
  • Faulty injector (sticking pintle, internal leakage, failed solenoid)
  • Low fuel pressure or weak fuel pump reducing flow
  • Wiring harness damage, poor connector, or corroded pins at injector

Symptoms

  • Rough idle or vibration, often localized to cylinder 2
  • Misfire on cylinder 2 (may set P0302 as well)
  • Loss of power or poor acceleration under load
  • Increased fuel consumption or stumble on throttle
  • Hard starting or extended cranking
  • Black smoke (diesel) or rich/uneven exhaust if flow is inconsistent

What to check

  • Read freeze-frame and live PID data with a scan tool to confirm conditions when the fault set (RPM, load, fuel pressure, temp).
  • Check for additional codes (misfires, low fuel pressure, injector circuit codes) to narrow cause.
  • Visually inspect injector connector, wiring harness and pins for corrosion, damage or poor connection.
  • Confirm fuel pressure and rail flow are within manufacturer specification with engine cranking and running.
  • Inspect and replace fuel filter if restricted; check inlet screens and any supply restrictors.
  • Swap cylinder 2 injector with another cylinder and see if the code or misfire follows the injector.

Signal parameters

  • Injector coil resistance (Ω) — compare to manufacturer specification
  • Injector activation current (A) during pulse — waveform shows expected current ramp
  • Injector pulse width (ms) at given RPM and load (from scan tool)
  • Fuel rail pressure (psi or bar) at idle, during cranking and under load
  • Fuel flow rate or injector volume (cc/min) during bench or on-engine flow test
  • Short-term and long-term fuel trim (%) for bank/cylinder comparisons

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data. Note engine conditions (RPM, load, temp, fuel pressure) when P02A0 set.
  2. Perform a visual inspection of the injector harness and connector for damage, corrosion or loose pins. Repair any wiring faults.
  3. Verify proper fuel pressure and supply flow. Replace fuel filter if clogged and inspect rail feed lines and inlet screens.
  4. Check injector electrical integrity: measure coil resistance and compare to spec; check for short to ground or open circuit.
  5. Use a noid light or oscilloscope to confirm the PCM is commanding the injector on cylinder 2 (pulse width and frequency). If no command, investigate PCM/injector driver and wiring.
  6. Swap the suspect injector with a known-good injector from another cylinder. Erase codes and run engine. If the fault follows the injector, focus on the injector; if it stays on cylinder 2, focus on wiring/PCM.
  7. If electrically commanded but flow is low, perform an on-vehicle injector flow test or remove the injector for bench flow testing/inspection and cleaning.
  8. Inspect removed injector for clogged nozzle, varnish, or physical damage. Clean (ultrasonic or professional cleaning) and retest, or replace if cleaning fails or if internal failure is present.
  9. After repair or replacement, clear codes and run the engine across operating conditions to confirm the fault does not return and that fuel trims/misfire counts are normal.
  10. If wiring and injector check good but restriction is present, inspect fuel rail restrictors, delivery metering components, or replace PCM only after confirming driver failure with manufacturer-guided tests.

Likely causes

  • Injector nozzle clogged by deposits or particulates
  • Fuel supply restriction (filter, line, rail) reducing flow to that injector
  • Failed injector solenoid or internal mechanical failure
  • Open/short or high resistance in injector wiring or connector
  • PCM/driver module fault (less common) after electrical checks

Fault status

⚠️ Status
PCM detected restricted injector flow at cylinder 2 causing reduced injection volume or response; diagnostic verification required before repair.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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Code

P02A0

LAND ROVER P — Powertrain

Cylinder 2 Balance - restricted injection

Brand: LAND ROVER
Type: P — Powertrain
Views: UK: 17 EN: 42 RU: 21
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Clogged or partially blocked injector nozzle or inlet screen
  • Contaminated fuel (debris, varnish, water, or particulates)
  • Collapsed or restricted fuel supply line or rail feed to cylinder 2
  • Faulty injector (sticking pintle, internal leakage, failed solenoid)
  • Low fuel pressure or weak fuel pump reducing flow
  • Wiring harness damage, poor connector, or corroded pins at injector

Symptoms

  • Rough idle or vibration, often localized to cylinder 2
  • Misfire on cylinder 2 (may set P0302 as well)
  • Loss of power or poor acceleration under load
  • Increased fuel consumption or stumble on throttle
  • Hard starting or extended cranking
  • Black smoke (diesel) or rich/uneven exhaust if flow is inconsistent

What to check

  • Read freeze-frame and live PID data with a scan tool to confirm conditions when the fault set (RPM, load, fuel pressure, temp).
  • Check for additional codes (misfires, low fuel pressure, injector circuit codes) to narrow cause.
  • Visually inspect injector connector, wiring harness and pins for corrosion, damage or poor connection.
  • Confirm fuel pressure and rail flow are within manufacturer specification with engine cranking and running.
  • Inspect and replace fuel filter if restricted; check inlet screens and any supply restrictors.
  • Swap cylinder 2 injector with another cylinder and see if the code or misfire follows the injector.

Signal parameters

  • Injector coil resistance (Ω) — compare to manufacturer specification
  • Injector activation current (A) during pulse — waveform shows expected current ramp
  • Injector pulse width (ms) at given RPM and load (from scan tool)
  • Fuel rail pressure (psi or bar) at idle, during cranking and under load
  • Fuel flow rate or injector volume (cc/min) during bench or on-engine flow test
  • Short-term and long-term fuel trim (%) for bank/cylinder comparisons

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data. Note engine conditions (RPM, load, temp, fuel pressure) when P02A0 set.
  2. Perform a visual inspection of the injector harness and connector for damage, corrosion or loose pins. Repair any wiring faults.
  3. Verify proper fuel pressure and supply flow. Replace fuel filter if clogged and inspect rail feed lines and inlet screens.
  4. Check injector electrical integrity: measure coil resistance and compare to spec; check for short to ground or open circuit.
  5. Use a noid light or oscilloscope to confirm the PCM is commanding the injector on cylinder 2 (pulse width and frequency). If no command, investigate PCM/injector driver and wiring.
  6. Swap the suspect injector with a known-good injector from another cylinder. Erase codes and run engine. If the fault follows the injector, focus on the injector; if it stays on cylinder 2, focus on wiring/PCM.
  7. If electrically commanded but flow is low, perform an on-vehicle injector flow test or remove the injector for bench flow testing/inspection and cleaning.
  8. Inspect removed injector for clogged nozzle, varnish, or physical damage. Clean (ultrasonic or professional cleaning) and retest, or replace if cleaning fails or if internal failure is present.
  9. After repair or replacement, clear codes and run the engine across operating conditions to confirm the fault does not return and that fuel trims/misfire counts are normal.
  10. If wiring and injector check good but restriction is present, inspect fuel rail restrictors, delivery metering components, or replace PCM only after confirming driver failure with manufacturer-guided tests.

Likely causes

  • Injector nozzle clogged by deposits or particulates
  • Fuel supply restriction (filter, line, rail) reducing flow to that injector
  • Failed injector solenoid or internal mechanical failure
  • Open/short or high resistance in injector wiring or connector
  • PCM/driver module fault (less common) after electrical checks

Fault status

⚠️ Status
PCM detected restricted injector flow at cylinder 2 causing reduced injection volume or response; diagnostic verification required before repair.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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P0202 P0200 P0302 P0171 P0174
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