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Home / DTC / P02A4 — Cylinder 3 - Injector Restricted

P02A4 — Cylinder 3 - Injector Restricted

Detailed page for trouble code P02A4.

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P02A4

Generic P — Powertrain

Cylinder 3 - Injector Restricted

Brand: Generic
Type: P — Powertrain
Views: UK: 37 EN: 60 RU: 38
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Clogged or partially blocked fuel injector (carbon, varnish, debris)
  • Restricted fuel supply to injector (blocked fuel line, clogged rail port, clogged filter)
  • Collapsed or kinked fuel return/pressure line
  • Injector internal mechanical fault (stuck pintle, valve spring, debris)
  • Injector metering or nozzle contamination from varnish/carbon
  • Low fuel rail pressure or intermittent pressure drop

Symptoms

  • Check Engine Light (MIL) illuminated
  • Rough idle or engine vibration specific to cylinder 3
  • Reduced engine power, hesitation or stumble under load
  • Increased fuel consumption or black smoke (diesel)
  • Misfire detected on cylinder 3 (P0303 may also appear)
  • Hard starting or cold start issues on affected cylinder

What to check

  • Read and record freeze frame and live data (misfire counts, fuel trims, injector pulse width/current)
  • Confirm accompanying DTCs (misfire codes, fuel pressure or injector circuit codes)
  • Visual inspection of injector 3 wiring, connector and O-ring for damage or fuel leaks
  • Inspect fuel filter condition and service history
  • Inspect fuel rail and supply/return lines for blockage, kinks or collapsed sections
  • Check fuel rail pressure with a gauge during cranking and running; compare to spec

Signal parameters

  • Injector pulse width (ms) — varies by engine; note differences vs other cylinders
  • Injector duty cycle (%) — compare cylinder 3 to others
  • Injector coil resistance (ohms) — compare to other injectors and spec
  • Injector drive current (A) if available — should be consistent across cylinders
  • Fuel rail pressure (psi or bar) — steady and within manufacturer spec during idle/load/crank
  • Short-term and long-term fuel trim (%) — look for compensating changes

Diagnostic algorithm

  1. Connect scan tool, record freeze-frame, pending codes and live data (fuel trims, injector pulse, misfire counts).
  2. Compare injector parameters (pulse width, duty cycle, resistance/current) for cylinder 3 against other cylinders; note any large deviations.
  3. Check fuel rail pressure at key conditions (key on, cranking, idle, under load). Verify system pressure is within spec and stable.
  4. Perform visual inspection of injector 3 connector, wiring and O-ring for damage, corrosion or fuel leakage. Repair any wiring faults before replacing components.
  5. Inspect/replace fuel filter and check for debris or contamination in fuel lines and rail; relieve pressure and inspect rail feed port for blockage.
  6. Perform an injector flow/balance test or a cylinder contribution test. If cylinder 3 shows significantly lower flow/contribution, remove injector for bench flow check or ultrasonic cleaning as applicable.
  7. Swap injector 3 with a known-good injector from another cylinder (or swap harness/connector) to determine if condition follows the injector or stays with cylinder 3 (moves = bad injector; stays = supply/engine issue).
  8. If the injector is suspected, measure coil resistance and perform an on-car current/pulse test if possible. Replace or professionally clean the injector if restricted or mechanically faulty.
  9. After repair or cleaning, clear codes and road test. Recheck for return of P02A4 and verify normal fuel/injector data and cylinder balance.
  10. If problem persists and injector and supply lines are good, inspect PCM/injector driver outputs and fuel system components (pressure regulator, rail check valve) and refer to manufacturer-specific tests.

Likely causes

  • Clogged/dirty injector nozzle on cylinder 3
  • Debris or varnish restricting flow from the rail to injector 3
  • Clogged fuel filter or localized blockage in rail/line feeding cylinder 3
  • Failed injector (mechanical sticking)

Fault status

⚠️ Status
P02A4 — Cylinder 3 Injector Restricted. MIL may be illuminated. Reduced performance, misfire and increased emissions possible until repaired.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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Code

P02A4

LAND ROVER P — Powertrain

cylinder 3 balance - injector restriction

Brand: LAND ROVER
Type: P — Powertrain
Views: UK: 18 EN: 20 RU: 17
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Clogged or partially blocked fuel injector (carbon, varnish, debris)
  • Restricted fuel supply to injector (blocked fuel line, clogged rail port, clogged filter)
  • Collapsed or kinked fuel return/pressure line
  • Injector internal mechanical fault (stuck pintle, valve spring, debris)
  • Injector metering or nozzle contamination from varnish/carbon
  • Low fuel rail pressure or intermittent pressure drop

Symptoms

  • Check Engine Light (MIL) illuminated
  • Rough idle or engine vibration specific to cylinder 3
  • Reduced engine power, hesitation or stumble under load
  • Increased fuel consumption or black smoke (diesel)
  • Misfire detected on cylinder 3 (P0303 may also appear)
  • Hard starting or cold start issues on affected cylinder

What to check

  • Read and record freeze frame and live data (misfire counts, fuel trims, injector pulse width/current)
  • Confirm accompanying DTCs (misfire codes, fuel pressure or injector circuit codes)
  • Visual inspection of injector 3 wiring, connector and O-ring for damage or fuel leaks
  • Inspect fuel filter condition and service history
  • Inspect fuel rail and supply/return lines for blockage, kinks or collapsed sections
  • Check fuel rail pressure with a gauge during cranking and running; compare to spec

Signal parameters

  • Injector pulse width (ms) — varies by engine; note differences vs other cylinders
  • Injector duty cycle (%) — compare cylinder 3 to others
  • Injector coil resistance (ohms) — compare to other injectors and spec
  • Injector drive current (A) if available — should be consistent across cylinders
  • Fuel rail pressure (psi or bar) — steady and within manufacturer spec during idle/load/crank
  • Short-term and long-term fuel trim (%) — look for compensating changes

Diagnostic algorithm

  1. Connect scan tool, record freeze-frame, pending codes and live data (fuel trims, injector pulse, misfire counts).
  2. Compare injector parameters (pulse width, duty cycle, resistance/current) for cylinder 3 against other cylinders; note any large deviations.
  3. Check fuel rail pressure at key conditions (key on, cranking, idle, under load). Verify system pressure is within spec and stable.
  4. Perform visual inspection of injector 3 connector, wiring and O-ring for damage, corrosion or fuel leakage. Repair any wiring faults before replacing components.
  5. Inspect/replace fuel filter and check for debris or contamination in fuel lines and rail; relieve pressure and inspect rail feed port for blockage.
  6. Perform an injector flow/balance test or a cylinder contribution test. If cylinder 3 shows significantly lower flow/contribution, remove injector for bench flow check or ultrasonic cleaning as applicable.
  7. Swap injector 3 with a known-good injector from another cylinder (or swap harness/connector) to determine if condition follows the injector or stays with cylinder 3 (moves = bad injector; stays = supply/engine issue).
  8. If the injector is suspected, measure coil resistance and perform an on-car current/pulse test if possible. Replace or professionally clean the injector if restricted or mechanically faulty.
  9. After repair or cleaning, clear codes and road test. Recheck for return of P02A4 and verify normal fuel/injector data and cylinder balance.
  10. If problem persists and injector and supply lines are good, inspect PCM/injector driver outputs and fuel system components (pressure regulator, rail check valve) and refer to manufacturer-specific tests.

Likely causes

  • Clogged/dirty injector nozzle on cylinder 3
  • Debris or varnish restricting flow from the rail to injector 3
  • Clogged fuel filter or localized blockage in rail/line feeding cylinder 3
  • Failed injector (mechanical sticking)

Fault status

⚠️ Status
P02A4 — Cylinder 3 Injector Restricted. MIL may be illuminated. Reduced performance, misfire and increased emissions possible until repaired.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0203 P0200 P0303 P0263 P0193
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