P0266

Code

LAND ROVER P — Powertrain

Cylinder 2 contribution / balance

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 24 EN: 79 RU: 42

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Page language: EN

Causes

Faulty or partially clogged fuel injector (cylinder 2)
Injector driver/transistor or ECM output fault for cylinder 2
Open/short/intermittent wiring or poor connector at injector #2
Low compression or mechanical problem in cylinder 2 (valve, piston, rings)
Low fuel rail pressure or intermittent fuel supply
Timing or cam/crank position sensor problems causing incorrect injection timing

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Rough idle or vibration, especially at idle
Reduced engine power and poor acceleration
Increased fuel consumption and visible smoke (diesel: black/white smoke depending on condition)
Possible hard starting or hesitation
Related misfire code (e.g., P0302) may also be present

What to check

Read and record stored codes and freeze-frame data with a capable scan tool
Check for related codes (injector circuit codes P0202, misfire P0302, fuel rail pressure codes)
Scan live data: individual cylinder contribution/misfire counters and injector pulse widths
Visual inspection of injector #2 connector and harness for damage, corrosion, or looseness
Measure injector #2 coil resistance and compare to spec and to other injectors
Measure fuel rail/line pressure and inspect for leaks or restrictions

Signal parameters

Injector pulse width for cylinder 2 (ms)
Injector coil resistance/continuity (ohms)
Fuel rail pressure (bar or psi)
Crankshaft position sensor waveform / engine speed (RPM)
Camshaft position sensor signal / timing
Cylinder contribution or misfire counters per crank revolution

Diagnostic algorithm

Retrieve DTCs and freeze-frame data. Note operating conditions when code set (RPM, load, temp).
Scan live data: compare cylinder contribution/misfire counters and injector pulse widths. Confirm cylinder 2 shows reduced contribution.
Inspect wiring and connector for injector #2. Repair any damaged pins, corrosion, or poor grounding. Wiggle-test while monitoring live data for intermittent faults.
Measure injector #2 electrical resistance; compare to specification and to other injectors. If out of range, replace or bench-test injector.
Swap injector #2 with another cylinder (if accessible) and re-run contribution test. If problem follows injector, replace it.
Check fuel supply: measure fuel rail pressure under static and dynamic conditions and inspect for clogged filters or supply restrictions.
Perform a compression test or cylinder leakdown on cylinder 2 to rule out mechanical causes (valve/piston/ring problems).
Verify cam/crank timing and sensor signals with an oscilloscope; correct timing or replace faulty sensors as needed.
Check for intake leaks, EGR faults or turbo boost issues that could affect cylinder balance; repair as needed.
After repairs, clear codes and perform a road test/monitoring to confirm cylinder contribution is restored and code does not return.

Likely causes

Injector failure or partial blockage
Injector wiring harness or connector fault
Low compression in cylinder 2
Insufficient fuel rail pressure or fuel delivery issue
Timing/cam/crank sensor error affecting injector timing
Intake leak or EGR/turbo issue localized to that cylinder

Fault status

⚠️ Status

P0266 — Cylinder 2 contribution/balance. ECM detected lower-than-expected contribution from cylinder 2; inspect injector, wiring, fuel supply, compression, and timing.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-4 hours (varies with accessibility, required tests, and parts)

Repair manuals

Manual library for LAND ROVER

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Browse 413 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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P0266 — Cylinder 2 contribution / balance