P02A1

Code

LAND ROVER P — Powertrain

Cylinder 2 Balance - Injector Leak

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 20 EN: 28 RU: 18

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Page language: EN

Causes

Leaking or dribbling fuel injector (internal leak or stuck open)
Damaged or degraded injector pintle/seat or O-ring seal
Injector return line or rail leak (fuel draining back to tank)
Injector electrical/wiring fault causing incorrect pulse width reporting or control
Contaminated or worn injector causing abnormal flow characteristics
Low or unstable fuel rail pressure or failed fuel pressure regulator affecting cylinder balance

Symptoms

Rough idle or vibration, especially at idle
Misfire on cylinder 2 (may set P0302)
Poor fuel economy and rich running symptoms (black smoke from exhaust)
Fuel odor around engine bay or visible fuel around injector 2
Difficulty starting, blurred idle, or limp-home mode in some cases
Elevated short-term/long-term fuel trims or uneven cylinder contribution readings

What to check

Read and record freeze frame and live data with a capable scan tool (cylinder contribution, injector balance, misfire counts, fuel trims, fuel rail pressure).
Check for related or pending codes (P0302, P0202, other injector codes).
Visually inspect injector 2, connector, wiring harness and O-ring for fuel leakage, damage or corrosion.
Smell or observe for fuel pooling around injector 2 with engine stopped (take care—use proper PPE and follow safety procedures).
Measure injector electrical resistance and compare to manufacturer spec. Check connector pins for corrosion/loose fit.
Verify fuel rail pressure is within spec and stable under load. Check for excessive return flow if applicable.

Signal parameters

Injector pulse width (ms) for cylinder 2
Cylinder contribution/balance value (mg/stroke or relative % from scan tool)
Fuel rail pressure (static and dynamic, kPa/bar or psi)
Short-term and long-term fuel trims (STFT/LTFT)
Misfire counter for cylinder 2
Injector electrical resistance (ohms)

Diagnostic algorithm

Retrieve and record DTCs, freeze frame and live data (cylinder balance, pulse width, fuel rail pressure, fuel trims, misfire counts).
Visually inspect injector 2, harness, connector and O-rings for leaks, damage or fuel traces. Repair obvious harness/connectors.
Confirm fuel pressure and regulator operation per manufacturer specification. Address low or unstable rail pressure before injector replacement.
With a scan tool, run a cylinder contribution/balance test. Note if scanner shows persistent low/high contribution for cylinder 2. Clear codes and re-run to confirm reproducibility.
Measure injector 2 electrical resistance and compare to spec. If out of spec or intermittent, replace or repair connector/wiring.
Safely relieve fuel system pressure per manufacturer procedures. Remove injector 2 and inspect tip and seat for deposits, damage or wear. Replace O-rings and seals as needed. (Follow fuel safety and fire prevention procedures.)
If possible, perform an injector leak/flow test (bench or on-vehicle return-flow test) to quantify leakage. If injector leaks or flows outside spec, replace injector.
If a bench test is not available, swap injector 2 with another cylinder’s injector and clear codes. If code/imbalance moves to the swapped cylinder, the injector is faulty. If it remains on cylinder 2, suspect rail port, cylinder mechanical or PCM/wiring issue.
After repair or replacement, clear codes and road test while monitoring live data (cylinder balance, fuel trims, fuel rail pressure). Confirm code does not return and drivability is restored.
If wiring harness or PCM faults are suspected, perform backprobe/pin-voltage tests while observing injector driver signals per factory procedure and consult wiring diagrams. Replace or repair as directed.

Likely causes

Internal injector leakage on cylinder 2 (most common)
Failed injector O-ring allowing external leakage or air ingress
Clogged injector tip causing irregular spray then leakage
Faulty connector or wiring to injector 2 causing intermittent control or incorrect fill
High fuel rail return flow localized to cylinder 2 or cracked fuel rail port

Fault status

⚠️ Status

P02A1 — Cylinder 2 Balance: Injector Leak detected. Engine control reports cylinder 2 fuel contribution outside allowable limits, consistent with injector leakage or related fault.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5 - 3.0 hours

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P02A1 — Cylinder 2 Balance - Injector Leak