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Home / DTC / P219B — Bank 2 - Fuel air ratio imbalance Cylinder

P219B — Bank 2 - Fuel air ratio imbalance Cylinder

Detailed page for trouble code P219B.

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Code

P219B

LAND ROVER P — Powertrain

Bank 2 - Fuel air ratio imbalance Cylinder

Brand: LAND ROVER
Type: P — Powertrain
Views: UK: 15 EN: 13 RU: 16
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Page language: EN

Causes

  • Faulty or slow-response upstream O2 (lambda) sensor on Bank 2
  • Clogged, leaking, or electrically faulty fuel injector(s) on Bank 2
  • Intake manifold gasket leak or vacuum leak affecting Bank 2
  • Mass air flow (MAF) or manifold absolute pressure (MAP) sensor fault or contamination
  • Low or inconsistent fuel rail/pressure regulator performance
  • Exhaust leak upstream of O2 sensor on Bank 2

Symptoms

  • Check Engine Light (MIL) illuminated
  • Rough idle or vibration, specifically at low speeds
  • Reduced engine performance, hesitation or stumbling under acceleration
  • Increased fuel consumption
  • Possible occasional misfire codes for Bank 2 cylinders
  • Black smoke or fuel smell if running rich

What to check

  • Retrieve freeze-frame data and full DTC report; note related codes (misfire, fuel trim, sensor faults)
  • Inspect wiring and connectors for Bank 2 O2 sensors and fuel injectors for corrosion, damage or looseness
  • Compare short-term and long-term fuel trims between Bank 1 and Bank 2; look for sustained offsets on Bank 2
  • Monitor upstream O2 sensor (Bank 2) voltage and switching behavior vs Bank 1
  • Perform a visual inspection for intake manifold and vacuum leaks (smoke test recommended)
  • Check fuel rail pressure at idle and under load against manufacturer spec

Signal parameters

  • Upstream O2 (lambda) sensor (Bank 2): switching ~0.1–0.9 V (rapid oscillation) if healthy
  • Downstream O2 sensor (post-cat): relatively steady ~0.4–0.6 V (depends on design)
  • Short-term fuel trim (STFT) per bank: typically within ±10% at idle
  • Long-term fuel trim (LTFT) per bank: normally within ±10%; sustained >±10% indicates a problem
  • Fuel rail pressure: check against manufacturer spec (typical gasoline systems ~40–60 psi / 2.8–4.1 bar)
  • MAF sensor: grams/sec or air flow value consistent with engine speed and load (manufacturer spec)

Diagnostic algorithm

  1. Read and record DTCs and freeze-frame data. Clear codes and attempt to reproduce; monitor live data.
  2. Compare STFT/LTFT and upstream O2 voltages between Bank 1 and Bank 2 to confirm imbalance is bank-specific.
  3. Inspect wiring and connectors for Bank 2 O2 sensor(s) and injectors; repair any damage or corrosion.
  4. Perform a smoke test of the intake to locate vacuum leaks around the Bank 2 intake manifold, gasket, vacuum hoses and PCV system.
  5. Check fuel pressure and volume under static and dynamic conditions; verify regulator and pump operation.
  6. Test injector electrical resistance and operation; consider swapping a suspect injector with the same-cylinder injector on Bank 1 to see if code follows injector.
  7. Verify MAF/MAP sensor readings and clean or replace MAF if contaminated; compare measured air flow to expected values.
  8. Monitor upstream O2 sensor response time and waveform; replace if slow or out of expected range.
  9. If mechanical fault suspected, perform compression and/or leakdown tests on Bank 2 cylinders.
  10. After repairs, clear codes and perform a road test while monitoring fuel trims and O2 sensors; check for return of the DTC.
  11. Check for technical service bulletins (TSBs) and confirm PCM software is up to date before replacing major components.

Likely causes

  • Contaminated or failing upstream O2 sensor on Bank 2 giving biased readings
  • One cylinder injector on Bank 2 partially clogged or leaking, causing cylinder-level imbalance
  • Vacuum leak localized to Bank 2 intake runner or manifold gasket allowing extra air
  • Low fuel pressure or weak pump causing lean condition under load
  • Damaged wiring or connector to injector(s) or O2 sensor producing intermittent/incorrect signals

Fault status

⚠️ Status
Stored code P219B = Fuel–air ratio imbalance detected for a cylinder on Bank 2. The PCM has detected a persistent deviation in oxygen sensor/fuel trim behavior on Bank 2 that may be caused by a sensor fault, fuel delivery issue, vacuum leak, injector problem, or mechanical fault. Addressing underlying cause is required to restore correct combustion and emissions.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-4.0 hours

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