Code
P02A0
Generic
P — Powertrain
Cylinder 2 - Injector Restricted
Views:
UK: 18
EN: 46
RU: 23
AI status
Completed
Completed
100%
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
- Retrieve codes and freeze-frame data. Note engine conditions (RPM, load, temp, fuel pressure) when P02A0 set.
- Perform a visual inspection of the injector harness and connector for damage, corrosion or loose pins. Repair any wiring faults.
- Verify proper fuel pressure and supply flow. Replace fuel filter if clogged and inspect rail feed lines and inlet screens.
- Check injector electrical integrity: measure coil resistance and compare to spec; check for short to ground or open circuit.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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
Views:
UK: 10
EN: 18
RU: 9
AI status
Completed
Completed
100%
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
- Retrieve codes and freeze-frame data. Note engine conditions (RPM, load, temp, fuel pressure) when P02A0 set.
- Perform a visual inspection of the injector harness and connector for damage, corrosion or loose pins. Repair any wiring faults.
- Verify proper fuel pressure and supply flow. Replace fuel filter if clogged and inspect rail feed lines and inlet screens.
- Check injector electrical integrity: measure coil resistance and compare to spec; check for short to ground or open circuit.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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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Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
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Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
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