Code
P219D
Generic
P — Powertrain
Cylinder 2 Air-Fuel Ratio Imbalance
Views:
UK: 18
EN: 24
RU: 29
AI status
Completed
Completed
100%
Causes
- Clogged, leaking, or poorly performing fuel injector (cylinder 2)
- Intake manifold gasket leak or vacuum leak affecting cylinder 2
- Low or uneven cylinder compression (valve, piston ring, head gasket issues)
- Faulty or contaminated cylinder-specific oxygen/AFR sensor or wideband sensor
- Fuel pressure too low or unstable (fuel pump/regulator issues)
- Wiring or connector fault to injector or sensor for cylinder 2
Symptoms
- Check Engine Lamp (CEL) illuminated with P219D present
- Rough idle or vibration, especially at idle
- Poor fuel economy and increased emissions
- Hesitation, stumbling or lack of power under load
- Possible misfire on cylinder 2 (may set P0302)
- Unstable or unusually high/low short-term fuel trim for cylinder 2
What to check
- Retrieve and record freeze frame and confirmed code count with a scan tool
- View live data: per-cylinder or relative fuel trims, long-term/short-term fuel trims, and cylinder balance if available
- Monitor upstream and downstream O2 / wideband sensor voltages or lambda readings for switching and consistency
- Compare fuel trims between cylinders — look for a persistent offset on cylinder 2
- Perform a fuel rail pressure check and inspect fuel supply for proper pressure and stability
- Visually inspect injector wiring and connectors for damage, corrosion, or poor pins at cylinder 2
Signal parameters
- Expected stoichiometric AFR ~14.7:1 (lambda ~1.0) for gasoline; wideband outputs typically 0–5 V or lambda values around 1.0 when stoic
- Short-term fuel trim (STFT) normally within roughly ±10% (manufacturer specific)
- Long-term fuel trim (LTFT) should be near zero; a per-cylinder deviation >6–10% vs other cylinders can trigger imbalance faults
- Wideband lambda deviation from other cylinders or the bank beyond manufacturer threshold (commonly >0.1 lambda)
- Injector resistance typically within manufacturer spec (consult service data)
- Fuel rail pressure within specified range and stable (varies by system)
Diagnostic algorithm
- Confirm code and freeze-frame data. Clear codes and retest to verify repeatability during warm running conditions.
- With a scan tool, record live data: STFT/LTFT, per-cylinder trims or cylinder balance, O2/wideband readings, and injector pulse widths for cylinder 2 compared to others.
- Inspect connectors and wiring for the cylinder 2 injector and related O2/wideband sensor—repair any corrosion or damage; wiggle-test while monitoring live data.
- Check fuel rail pressure and inspect fuel supply for restrictions; replace fuel filter if suspect.
- Perform an intake leak check (smoke or pressure) focused on the intake manifold gasket and vacuum lines around cylinder 2.
- Test injector electrical resistance and, if available, perform an injector flow/activation test or use an oscilloscope to verify proper injector waveform and duty cycle.
- Do a relative compression/cylinder balance test. If low compression is found, proceed to wet compression or leak-down to locate valve, ring, or head gasket issues.
- Inspect exhaust manifold and gasket for leaks near cylinder 2 which can affect O2 readings; repair if found.
- If O2/wideband sensor is suspected, confirm sensor operation and heater circuit; replace sensor only after ruling out air/fuel delivery and mechanical causes.
- After repair or component replacement, clear codes and perform a road test to confirm the imbalance is resolved and trims have normalized.
Likely causes
- Fuel injector for cylinder 2 clogged or leaking
- Intake manifold gasket leak at cylinder 2 or nearby vacuum leak
- Compression or mechanical fault in cylinder 2 (worn ring, valve seating)
- Faulty cylinder-specific O2/wideband sensor or sensor wiring
- Low/faulty fuel pressure or contaminated fuel
Fault status
Status
PCM detected a persistent air–fuel ratio imbalance on cylinder 2 and stored P219D. Fuel trim or lambda for cylinder 2 deviates beyond the manufacturer threshold indicating localized AFR imbalance.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P219D
LAND ROVER
P — Powertrain
2 - Imbalance in the fuel-to-air ratio Cylinder
Views:
UK: 5
EN: 16
RU: 10
AI status
Completed
Completed
100%
Causes
- Clogged, leaking, or poorly performing fuel injector (cylinder 2)
- Intake manifold gasket leak or vacuum leak affecting cylinder 2
- Low or uneven cylinder compression (valve, piston ring, head gasket issues)
- Faulty or contaminated cylinder-specific oxygen/AFR sensor or wideband sensor
- Fuel pressure too low or unstable (fuel pump/regulator issues)
- Wiring or connector fault to injector or sensor for cylinder 2
Symptoms
- Check Engine Lamp (CEL) illuminated with P219D present
- Rough idle or vibration, especially at idle
- Poor fuel economy and increased emissions
- Hesitation, stumbling or lack of power under load
- Possible misfire on cylinder 2 (may set P0302)
- Unstable or unusually high/low short-term fuel trim for cylinder 2
What to check
- Retrieve and record freeze frame and confirmed code count with a scan tool
- View live data: per-cylinder or relative fuel trims, long-term/short-term fuel trims, and cylinder balance if available
- Monitor upstream and downstream O2 / wideband sensor voltages or lambda readings for switching and consistency
- Compare fuel trims between cylinders — look for a persistent offset on cylinder 2
- Perform a fuel rail pressure check and inspect fuel supply for proper pressure and stability
- Visually inspect injector wiring and connectors for damage, corrosion, or poor pins at cylinder 2
Signal parameters
- Expected stoichiometric AFR ~14.7:1 (lambda ~1.0) for gasoline; wideband outputs typically 0–5 V or lambda values around 1.0 when stoic
- Short-term fuel trim (STFT) normally within roughly ±10% (manufacturer specific)
- Long-term fuel trim (LTFT) should be near zero; a per-cylinder deviation >6–10% vs other cylinders can trigger imbalance faults
- Wideband lambda deviation from other cylinders or the bank beyond manufacturer threshold (commonly >0.1 lambda)
- Injector resistance typically within manufacturer spec (consult service data)
- Fuel rail pressure within specified range and stable (varies by system)
Diagnostic algorithm
- Confirm code and freeze-frame data. Clear codes and retest to verify repeatability during warm running conditions.
- With a scan tool, record live data: STFT/LTFT, per-cylinder trims or cylinder balance, O2/wideband readings, and injector pulse widths for cylinder 2 compared to others.
- Inspect connectors and wiring for the cylinder 2 injector and related O2/wideband sensor—repair any corrosion or damage; wiggle-test while monitoring live data.
- Check fuel rail pressure and inspect fuel supply for restrictions; replace fuel filter if suspect.
- Perform an intake leak check (smoke or pressure) focused on the intake manifold gasket and vacuum lines around cylinder 2.
- Test injector electrical resistance and, if available, perform an injector flow/activation test or use an oscilloscope to verify proper injector waveform and duty cycle.
- Do a relative compression/cylinder balance test. If low compression is found, proceed to wet compression or leak-down to locate valve, ring, or head gasket issues.
- Inspect exhaust manifold and gasket for leaks near cylinder 2 which can affect O2 readings; repair if found.
- If O2/wideband sensor is suspected, confirm sensor operation and heater circuit; replace sensor only after ruling out air/fuel delivery and mechanical causes.
- After repair or component replacement, clear codes and perform a road test to confirm the imbalance is resolved and trims have normalized.
Likely causes
- Fuel injector for cylinder 2 clogged or leaking
- Intake manifold gasket leak at cylinder 2 or nearby vacuum leak
- Compression or mechanical fault in cylinder 2 (worn ring, valve seating)
- Faulty cylinder-specific O2/wideband sensor or sensor wiring
- Low/faulty fuel pressure or contaminated fuel
Fault status
Status
PCM detected a persistent air–fuel ratio imbalance on cylinder 2 and stored P219D. Fuel trim or lambda for cylinder 2 deviates beyond the manufacturer threshold indicating localized AFR imbalance.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Workshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
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0
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