Search the library
Find reliability topics fast
Search across 192 technical insights, blog posts, brand hubs, buying guides, and reliability pages by symptom, engine, gearbox, brand, or system.
93 results
Showing matches for "Mercedes-Benz E-Class".
C1130: Chassis control or suspension pressure fault
A chassis or suspension control module has detected an implausible pressure, height, or control-state condition.
P0011: Intake camshaft timing over-advanced, bank 1
The intake camshaft is more advanced than the ECU expects for the current operating condition.
P0014: Exhaust camshaft timing over-advanced, bank 1
The exhaust camshaft position is more advanced than commanded or is slow to return to the expected position.
P0016: Crankshaft / camshaft timing correlation
The ECU sees the crankshaft and camshaft signals outside their expected relationship.
P0017: Crankshaft / camshaft timing correlation, bank 1 sensor B
The exhaust-camshaft and crankshaft signals on bank 1 are outside their expected relationship.
P0030: Heated oxygen sensor heater control circuit, bank 1 sensor 1
The ECU detects an electrical fault in the heater circuit for the upstream oxygen sensor.
P0068: Throttle body airflow correlation
Throttle position, manifold pressure, and measured airflow do not agree with one another.
P0087: Fuel rail pressure too low
Measured fuel pressure fell below the pressure requested by the engine controller.
P0088: Fuel rail pressure too high
Measured fuel-rail pressure exceeds the value requested by the engine controller.
P0093: Large fuel-system leak detected
Fuel pressure is dropping at a rate that the ECU interprets as a major leak or excessive internal loss.
P0101: Mass-air-flow signal range / performance
Airflow reported by the MAF sensor does not agree with the ECU's calculated operating conditions.
P0106: Manifold absolute pressure range / performance
The MAP sensor signal does not match the pressure expected from throttle position, boost, engine speed, and airflow.
P0113: Intake-air temperature sensor circuit high
The ECU sees an intake-air temperature signal that is higher voltage than expected, often interpreted as an unrealistically cold reading.
P0118: Engine coolant temperature sensor circuit high
The coolant-temperature signal is implausibly high voltage, often read by the ECU as extremely cold coolant.
P0121: Throttle / pedal position sensor range / performance
The ECU sees a throttle or accelerator-position signal that is outside the expected relationship.
P0128: Coolant thermostat below regulating temperature
The engine is taking too long to reach expected operating temperature or is running cooler than the ECU expects.
P0130: Oxygen sensor circuit malfunction, bank 1 sensor 1
The upstream oxygen or lambda sensor signal is implausible, missing, or outside the control range expected by the ECU.
P0135: Oxygen sensor heater circuit, bank 1 sensor 1
The upstream oxygen sensor heater circuit is not operating as expected.
P0141: Oxygen sensor heater circuit, bank 1 sensor 2
The downstream oxygen sensor heater circuit is not reaching expected operation.
P0171: System too lean, bank 1
Fuel trim has reached a lean threshold because the ECU is adding more fuel than expected.
P0172: System too rich, bank 1
Fuel trim has reached a rich threshold because the ECU is removing more fuel than expected.
P0191: Fuel rail pressure sensor range / performance
The rail-pressure signal is implausible or does not follow commanded pressure correctly.
P0217: Engine coolant over-temperature condition
The engine controller recorded coolant temperature above its safe operating threshold.
P0335: Crankshaft position sensor circuit
The ECU is missing or cannot trust the crankshaft position signal.
P0340: Camshaft position sensor circuit, bank 1
The ECU is missing or cannot trust the camshaft position signal on bank 1.
P0401: Exhaust-gas recirculation flow insufficient
Measured or inferred EGR flow is lower than the controller expects.
P0402: Exhaust-gas recirculation flow excessive
The ECU detects more EGR flow than requested, often because the valve is not closing correctly.
P0403: Exhaust-gas recirculation control circuit malfunction
The ECU detects an electrical fault in the EGR valve or its control circuit.
P0411: Secondary-air injection incorrect flow
The ECU does not see the expected oxygen-sensor response when the secondary-air system runs on cold start.
P0420: Catalyst efficiency below threshold, bank 1
Upstream and downstream oxygen-sensor behavior suggests insufficient catalyst oxygen-storage performance.
P0441: EVAP purge flow incorrect
The fuel-vapor purge system flow is not matching the ECU's commanded behavior.
P0442: EVAP system small leak detected
The fuel-vapor system cannot hold the small vacuum or pressure change expected during the leak test.
P0455: EVAP system gross leak detected
The fuel-vapor system has a large leak or cannot seal during its self-test.
P0456: EVAP system very small leak detected
The fuel-vapor system has a very small leak during the ECU's leak test.
P0471: Exhaust pressure sensor range / performance
The exhaust-pressure sensor signal is implausible for engine load, speed, and DPF pressure conditions.
P0507: Idle control system RPM higher than expected
Idle speed is higher than the ECU's target after it has reached the limit of normal control correction.
