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Home / DTC / P02B6 — Cylinder 8 - Fuel Trim at Max Limit

P02B6 — Cylinder 8 - Fuel Trim at Max Limit

Detailed page for trouble code P02B6.

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Code

P02B6

Generic P — Powertrain

Cylinder 8 - Fuel Trim at Max Limit

Brand: Generic
Type: P — Powertrain
Views: UK: 27 EN: 32 RU: 22
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty or sticking fuel injector on cylinder 8 (leaking or not delivering fuel)
  • Wiring harness or connector fault to injector (open, shorted, high resistance, intermittent)
  • Intake manifold leak or vacuum leak near cylinder 8
  • Ignition problem on cylinder 8 (weak spark, bad coil, bad plug/wire)
  • Low or unstable fuel pressure or failing fuel pump/regulator
  • Clogged fuel injector or fuel rail blockage affecting cylinder 8

Symptoms

  • Check Engine Light (MIL) illuminated
  • Persistent lean or rich condition reported on scan tool for cylinder 8
  • Rough idle or vibration, especially at idle or low load
  • Reduced power or hesitation under acceleration
  • Decreased fuel economy
  • Possible misfire detected on cylinder 8

What to check

  • Read freeze frame and live data with a capable scan tool; note fuel trims, O2/AIR/Fuel sensor data, misfire counts, and freeze frame conditions
  • Inspect wiring and connector for injector 8 for corrosion, damage, or poor connection
  • Measure injector resistance and compare to specification
  • Perform a balance or cylinder contribution test (injector on-time test or cylinder cut-out)
  • Check fuel rail pressure and regulator operation under load
  • Smoke test for intake manifold or vacuum leaks near cylinder 8

Signal parameters

  • Short Term Fuel Trim (STFT) — expected within approximately ±10%
  • Long Term Fuel Trim (LTFT) — expected within approximately ±10%; extreme positive or negative values indicate problem
  • Cylinder contribution / balance (%) or per-cylinder trim when available
  • Injector pulse width (ms) and commanded vs actual duty cycle
  • Fuel rail pressure (psi or kPa) — steady and within manufacturer spec
  • O2 sensor voltage (0.1–0.9V switching) or Wideband AFR (near stoich 14.7:1 for gasoline)

Diagnostic algorithm

  1. Retrieve freeze frame and stored data. Confirm P02B6 is current and note conditions (RPM, load, coolant temp, fuel trims, related codes).
  2. Observe live fuel trim data and per-cylinder contribution while running. Verify that cylinder 8 trim is at/near max correction compared with others.
  3. Visually inspect injector 8 wiring and connector. Wiggle-test while monitoring for intermittent changes.
  4. Measure injector resistance and compare to spec. Use a noid light or scope to confirm injector is being commanded and to view waveform.
  5. Swap injector 8 with a known-good injector from another cylinder and rerun to see if code or symptom follows the injector (helps isolate mechanical/electrical).
  6. Perform a cylinder balance or cylinder cut-out test to confirm injector contribution and identify misfire differences.
  7. Check ignition components on cylinder 8: swap coil/plug with another cylinder to see if problem moves.
  8. Check fuel pressure at the rail with a gauge under load; ensure regulator and pump are within spec. Low pressure can cause high positive trims.
  9. Smoke-test intake manifold and vacuum lines near cylinder 8 for leaks; inspect intake gasket sealing.
  10. Perform compression and/or leak-down test on cylinder 8 if mechanical failure is suspected.
  11. Inspect and test upstream sensors that affect trims (MAF, MAP, upstream O2). Replace or repair as indicated.
  12. After repairs, clear codes and perform a road test with live data to confirm trims return to normal and code does not return.

Likely causes

  • Faulty injector (stuck closed -> lean or stuck open -> rich) on cylinder 8
  • Local vacuum leak or intake gasket leak at cylinder 8
  • Ignition failure (weak/no spark) causing unburned fuel and abnormal trim
  • Wiring/connector resistance or intermittent connection to the injector
  • Failed or drifting O2/AFR sensor causing incorrect trim commands

Fault status

⚠️ Status
PCM indicates per-cylinder fuel trim for cylinder 8 has reached the maximum correction limit. The controller cannot further compensate for the measured air/fuel imbalance on that cylinder and has stored a diagnostic trouble code.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours
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Code

P02B6

LAND ROVER P — Powertrain

cylinder balance 8 - fuel compensation at its limit maximum

Brand: LAND ROVER
Type: P — Powertrain
Views: UK: 13 EN: 19 RU: 15
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty or sticking fuel injector on cylinder 8 (leaking or not delivering fuel)
  • Wiring harness or connector fault to injector (open, shorted, high resistance, intermittent)
  • Intake manifold leak or vacuum leak near cylinder 8
  • Ignition problem on cylinder 8 (weak spark, bad coil, bad plug/wire)
  • Low or unstable fuel pressure or failing fuel pump/regulator
  • Clogged fuel injector or fuel rail blockage affecting cylinder 8

Symptoms

  • Check Engine Light (MIL) illuminated
  • Persistent lean or rich condition reported on scan tool for cylinder 8
  • Rough idle or vibration, especially at idle or low load
  • Reduced power or hesitation under acceleration
  • Decreased fuel economy
  • Possible misfire detected on cylinder 8

What to check

  • Read freeze frame and live data with a capable scan tool; note fuel trims, O2/AIR/Fuel sensor data, misfire counts, and freeze frame conditions
  • Inspect wiring and connector for injector 8 for corrosion, damage, or poor connection
  • Measure injector resistance and compare to specification
  • Perform a balance or cylinder contribution test (injector on-time test or cylinder cut-out)
  • Check fuel rail pressure and regulator operation under load
  • Smoke test for intake manifold or vacuum leaks near cylinder 8

Signal parameters

  • Short Term Fuel Trim (STFT) — expected within approximately ±10%
  • Long Term Fuel Trim (LTFT) — expected within approximately ±10%; extreme positive or negative values indicate problem
  • Cylinder contribution / balance (%) or per-cylinder trim when available
  • Injector pulse width (ms) and commanded vs actual duty cycle
  • Fuel rail pressure (psi or kPa) — steady and within manufacturer spec
  • O2 sensor voltage (0.1–0.9V switching) or Wideband AFR (near stoich 14.7:1 for gasoline)

Diagnostic algorithm

  1. Retrieve freeze frame and stored data. Confirm P02B6 is current and note conditions (RPM, load, coolant temp, fuel trims, related codes).
  2. Observe live fuel trim data and per-cylinder contribution while running. Verify that cylinder 8 trim is at/near max correction compared with others.
  3. Visually inspect injector 8 wiring and connector. Wiggle-test while monitoring for intermittent changes.
  4. Measure injector resistance and compare to spec. Use a noid light or scope to confirm injector is being commanded and to view waveform.
  5. Swap injector 8 with a known-good injector from another cylinder and rerun to see if code or symptom follows the injector (helps isolate mechanical/electrical).
  6. Perform a cylinder balance or cylinder cut-out test to confirm injector contribution and identify misfire differences.
  7. Check ignition components on cylinder 8: swap coil/plug with another cylinder to see if problem moves.
  8. Check fuel pressure at the rail with a gauge under load; ensure regulator and pump are within spec. Low pressure can cause high positive trims.
  9. Smoke-test intake manifold and vacuum lines near cylinder 8 for leaks; inspect intake gasket sealing.
  10. Perform compression and/or leak-down test on cylinder 8 if mechanical failure is suspected.
  11. Inspect and test upstream sensors that affect trims (MAF, MAP, upstream O2). Replace or repair as indicated.
  12. After repairs, clear codes and perform a road test with live data to confirm trims return to normal and code does not return.

Likely causes

  • Faulty injector (stuck closed -> lean or stuck open -> rich) on cylinder 8
  • Local vacuum leak or intake gasket leak at cylinder 8
  • Ignition failure (weak/no spark) causing unburned fuel and abnormal trim
  • Wiring/connector resistance or intermittent connection to the injector
  • Failed or drifting O2/AFR sensor causing incorrect trim commands

Fault status

⚠️ Status
PCM indicates per-cylinder fuel trim for cylinder 8 has reached the maximum correction limit. The controller cannot further compensate for the measured air/fuel imbalance on that cylinder and has stored a diagnostic trouble code.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours
160

Browse 160 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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