Code
P219C
Generic
P — Powertrain
Cylinder 1 Air-Fuel Ratio Imbalance
Views:
UK: 17
EN: 31
RU: 27
AI status
Completed
Completed
100%
Causes
- Faulty or leaking fuel injector at cylinder 1
- Clogged or partially restricted injector or fuel rail
- Low or fluctuating fuel rail pressure
- Intake manifold vacuum leak or gasket leak affecting cylinder 1
- Leaking intake or exhaust valve, or other mechanical problem (low compression)
- Damaged wiring, poor connector, or short/open to injector or related sensors
Symptoms
- Check Engine Light with P219C stored
- Rough idle or single-cylinder roughness (may feel like misfire)
- Poor fuel economy or strong fuel odor if mixture is rich
- Hesitation or loss of power under load
- Increased emissions or failed emissions test
- Possible black smoke from exhaust (rich) or intermittent misfire/pinging (lean)
What to check
- Retrieve freeze frame and live data for O2/wideband, short-term and long-term fuel trims, fuel pressure, and misfire counters
- Compare fuel trims between cylinders/banks and watch cylinder-specific trim data if available
- Visually inspect injector connector, wiring harness, and ground connections at cylinder 1
- Measure fuel rail pressure at idle and under load; compare to spec
- Perform a smoke test to detect intake manifold or vacuum leaks near cylinder 1
- Inspect MAF and air intake for contamination, damage, or unmetered air
Signal parameters
- Upstream oxygen sensor (narrowband) voltage typically oscillates ~0.1–0.9 V when healthy
- Wideband O2 should report lambda ≈ 1.00 at stoichiometric; persistent deviation on cylinder 1 indicates imbalance
- Short-term fuel trim (STFT) and long-term fuel trim (LTFT) typically within ±10% on a healthy system
- Cylinder balance or trim tests (if available) will show the affected cylinder requiring significantly more or less fuel compared with others
- Fuel rail pressure should be stable within manufacturer spec (common range ~40–70 psi on port-injected systems; varies by vehicle)
Diagnostic algorithm
- Read and record all stored and pending codes and freeze-frame data. Note conditions (engine temp, load, rpm) when code set.
- Perform a visual inspection: wiring/connectors at cylinder 1 injector, intake manifold, PCV hoses, vacuum lines, and exhaust near manifold.
- Monitor live data: observe upstream O2/wideband, STFT/LTFT, and misfire counters. Look for cylinder-specific trim imbalance.
- Check fuel pressure at the rail with a gauge. Verify pressure is within spec at idle and under commanded load.
- Test the injector electrically: check resistance, back-probe connector for proper drive voltage/ground while cranking/running. Follow safety for fuel system depressurization before disconnecting.
- Perform an injector flow/seat test or swap the suspect injector with another cylinder’s injector to see if the condition follows the injector.
- Do a smoke test of the intake to find vacuum/intake manifold gasket leaks near cylinder 1.
- Perform a compression and/or leak-down test on cylinder 1 to rule out mechanical issues (valves, rings, head gasket).
- Inspect and test the upstream O2/wideband sensor and MAF sensor; check wiring and connectors. Replace or re-pin if damaged.
- Check for exhaust leaks upstream of the O2 sensor that could alter sensor readings.
- After repairs, clear codes and road-test under similar conditions to the freeze-frame; verify fuel trims and O2/wideband behavior return to normal and code does not reappear.
- If all components test good and imbalance persists, consult manufacturer service information for PCM software updates or advanced diagnostics; consider professional lab-level injector flow testing.
Likely causes
- Injector electrical fault or hydraulic fault (clog, stuck open/closed)
- Local intake gasket/vacuum leak at cylinder 1
- Faulty upstream O2/wideband sensor or its wiring
- Low fuel pressure or regulator issue reducing overall flow
- Mechanical issue on cylinder 1 (poor compression, valve leak) affecting combustion
Fault status
Status
Detected air–fuel ratio imbalance localized to cylinder 1. Inspect injector, intake leak, fuel pressure, sensors, or mechanical condition.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P219C
LAND ROVER
P — Powertrain
1 - Imbalance in the fuel air ratio Cylinder
Views:
UK: 5
EN: 11
RU: 10
AI status
Completed
Completed
100%
Causes
- Faulty or leaking fuel injector at cylinder 1
- Clogged or partially restricted injector or fuel rail
- Low or fluctuating fuel rail pressure
- Intake manifold vacuum leak or gasket leak affecting cylinder 1
- Leaking intake or exhaust valve, or other mechanical problem (low compression)
- Damaged wiring, poor connector, or short/open to injector or related sensors
Symptoms
- Check Engine Light with P219C stored
- Rough idle or single-cylinder roughness (may feel like misfire)
- Poor fuel economy or strong fuel odor if mixture is rich
- Hesitation or loss of power under load
- Increased emissions or failed emissions test
- Possible black smoke from exhaust (rich) or intermittent misfire/pinging (lean)
What to check
- Retrieve freeze frame and live data for O2/wideband, short-term and long-term fuel trims, fuel pressure, and misfire counters
- Compare fuel trims between cylinders/banks and watch cylinder-specific trim data if available
- Visually inspect injector connector, wiring harness, and ground connections at cylinder 1
- Measure fuel rail pressure at idle and under load; compare to spec
- Perform a smoke test to detect intake manifold or vacuum leaks near cylinder 1
- Inspect MAF and air intake for contamination, damage, or unmetered air
Signal parameters
- Upstream oxygen sensor (narrowband) voltage typically oscillates ~0.1–0.9 V when healthy
- Wideband O2 should report lambda ≈ 1.00 at stoichiometric; persistent deviation on cylinder 1 indicates imbalance
- Short-term fuel trim (STFT) and long-term fuel trim (LTFT) typically within ±10% on a healthy system
- Cylinder balance or trim tests (if available) will show the affected cylinder requiring significantly more or less fuel compared with others
- Fuel rail pressure should be stable within manufacturer spec (common range ~40–70 psi on port-injected systems; varies by vehicle)
Diagnostic algorithm
- Read and record all stored and pending codes and freeze-frame data. Note conditions (engine temp, load, rpm) when code set.
- Perform a visual inspection: wiring/connectors at cylinder 1 injector, intake manifold, PCV hoses, vacuum lines, and exhaust near manifold.
- Monitor live data: observe upstream O2/wideband, STFT/LTFT, and misfire counters. Look for cylinder-specific trim imbalance.
- Check fuel pressure at the rail with a gauge. Verify pressure is within spec at idle and under commanded load.
- Test the injector electrically: check resistance, back-probe connector for proper drive voltage/ground while cranking/running. Follow safety for fuel system depressurization before disconnecting.
- Perform an injector flow/seat test or swap the suspect injector with another cylinder’s injector to see if the condition follows the injector.
- Do a smoke test of the intake to find vacuum/intake manifold gasket leaks near cylinder 1.
- Perform a compression and/or leak-down test on cylinder 1 to rule out mechanical issues (valves, rings, head gasket).
- Inspect and test the upstream O2/wideband sensor and MAF sensor; check wiring and connectors. Replace or re-pin if damaged.
- Check for exhaust leaks upstream of the O2 sensor that could alter sensor readings.
- After repairs, clear codes and road-test under similar conditions to the freeze-frame; verify fuel trims and O2/wideband behavior return to normal and code does not reappear.
- If all components test good and imbalance persists, consult manufacturer service information for PCM software updates or advanced diagnostics; consider professional lab-level injector flow testing.
Likely causes
- Injector electrical fault or hydraulic fault (clog, stuck open/closed)
- Local intake gasket/vacuum leak at cylinder 1
- Faulty upstream O2/wideband sensor or its wiring
- Low fuel pressure or regulator issue reducing overall flow
- Mechanical issue on cylinder 1 (poor compression, valve leak) affecting combustion
Fault status
Status
Detected air–fuel ratio imbalance localized to cylinder 1. Inspect injector, intake leak, fuel pressure, sensors, or mechanical condition.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
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Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
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