Code
P1162
PEUGEOT
P — Powertrain
Exhaust gas recycling coherence
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EN: 0
RU: 8
AI status
Completed
Completed
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Causes
- Stuck, seized or carbon-clogged EGR valve or passages
- Faulty EGR position sensor or feedback potentiometer
- Defective EGR actuator (vacuum solenoid or electric motor)
- Damaged or disconnected wiring / poor connector pins between EGR components and ECU
- Leaking or blocked vacuum/pressure supply lines (vacuum-operated EGR)
- Faulty MAP/MAF/engine sensors providing incorrect inputs to EGR control
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Rough idle, hesitation or stalling at low speed
- Reduced engine performance and drivability issues
- Increased smoke or soot from exhaust under certain conditions
- Reduced fuel economy
- Possible failed emissions test
What to check
- Read freeze-frame data and stored DTCs; note engine RPM, load and temperatures when the fault set
- Check live data: commanded EGR position vs actual EGR position (or EGR sensor feedback)
- Inspect EGR valve and passages for carbon deposits and free movement
- Inspect wiring and connectors to EGR valve/actuator and position sensor for damage, corrosion or looseness
- Check vacuum supply lines and vacuum solenoid (if vacuum operated) for leaks or proper operation
- Compare MAP/MAF, engine coolant and intake air temp sensor readings to expected values
Signal parameters
- Commanded EGR position: 0–100% (depending on engine load); actual/feedback should closely follow commanded value
- EGR position sensor voltage typically around 0.5–4.5 V across travel (manufacturer-specific)
- Acceptable position delta: typically within ~10–20% or set ECM tolerance (refer to factory data)
- Vacuum for EGR actuation (vacuum systems): vacuum present when commanded, approximate value depends on vehicle
- Engine conditions when test performed: warmed to operating temperature, stable idle or specified RPM (>1000 rpm for some tests)
- Battery voltage: 11–15 V during diagnostics
Diagnostic algorithm
- Connect a diagnostic scan tool, read and record all stored codes and freeze-frame data.
- Verify engine at normal operating temperature. Note engine speed/load when the fault occurred from freeze frame.
- Monitor live data: compare commanded EGR position to actual/feedback position while commanding EGR via the tool. Note any lack of response or large deviation.
- Perform a visual inspection of EGR valve, actuator, vacuum lines (if applicable) and EGR cooler for carbon build-up, restrictions, leaks or damage.
- Inspect wiring and connectors for continuity, corrosion, bent pins or intermittent connection. Back-probe EGR position sensor and verify expected voltages/signals while commanding EGR.
- If vacuum operated: test vacuum supply and vacuum solenoid operation (apply vacuum directly to EGR actuator to confirm movement).
- If electric actuator: check for voltage and ground at the actuator when commanded; verify actuator movement directly.
- If EGR valve is stuck or passages are clogged, remove and inspect/clean or replace as needed. Re-test operation after cleaning.
- If sensors or actuators fail to meet specification, replace the faulty component(s). After repair, clear codes and perform a drive cycle or re-run self-test to confirm problem is resolved.
- If all EGR components and wiring check good, review MAP/MAF and related sensor inputs and consider ECU reprogramming or replacement only after exhaustive verification.
Likely causes
- Carbon build-up causing EGR valve to stick or not travel full range
- Wiring/connector corrosion or intermittent connection at EGR position sensor
- Failed EGR actuator (no movement when commanded)
- Vacuum supply leak or faulty vacuum solenoid preventing proper actuation
- Incorrect sensor input (MAF/MAP) causing ECM to report incoherence
Fault status
Status
ECM detected incoherence between commanded EGR operation and the measured/expected feedback. Fault stored as P1162. Investigate EGR hardware, wiring and related intake sensors.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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