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.
76 results
Showing matches for "sensor".
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.
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.
P0325: Knock sensor circuit malfunction
The ECU is not receiving a plausible signal from the knock sensor circuit.
P0471: Exhaust pressure sensor range / performance
The exhaust-pressure sensor signal is implausible for engine load, speed, and DPF pressure conditions.
P0544: Exhaust-gas temperature sensor circuit, bank 1 sensor 1
The ECU sees an electrical fault in an exhaust-temperature sensor used to protect the turbo and emissions system.
P0641: Sensor reference voltage A circuit open
A shared 5-volt reference circuit for engine sensors is missing, shorted, or pulled out of range.
P2195: Oxygen sensor signal stuck lean, bank 1 sensor 1
The upstream oxygen sensor on bank 1 remains at a lean indication despite ECU correction.
P2201: NOx sensor circuit range / performance
A NOx sensor signal or its controller behavior is outside the expected operating range.
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.
P0191: Fuel rail pressure sensor range / performance
The rail-pressure signal is implausible or does not follow commanded pressure correctly.
P0236: Turbo boost sensor range / performance
The charge-pressure signal is outside the expected range or disagrees with operating conditions.
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.
P0706: Transmission range sensor circuit range / performance
The selected gear or park/neutral signal is implausible for the transmission's actual state.
P0715: Input / turbine speed sensor circuit
The transmission controller cannot trust the input or turbine speed signal.
P2135: Throttle position sensor correlation
The redundant throttle-position signals disagree beyond the permitted tolerance.
P2453: DPF differential-pressure sensor range / performance
The pressure signal used to calculate DPF restriction is implausible or outside range.
P2563: Turbocharger boost-control position sensor range / performance
The reported turbo actuator position does not match the requested or mechanically possible range.
AdBlue and NOx Faults: What Modern Diesel Buyers Should Know
A practical technical guide to SCR systems, NOx sensors, AdBlue pumps, countdown warnings, and why diesel emissions faults can become expensive.
P0101: Mass-air-flow signal range / performance
Airflow reported by the MAF sensor does not agree with the ECU's calculated operating conditions.
P0102: Mass-air-flow circuit low input
The MAF sensor signal is lower than expected for the engine speed and load.
P0106: Manifold absolute pressure range / performance
The MAP sensor signal does not match the pressure expected from throttle position, boost, engine speed, and airflow.
P0420: Catalyst efficiency below threshold, bank 1
Upstream and downstream oxygen-sensor behavior suggests insufficient catalyst oxygen-storage performance.
P0017: Crankshaft / camshaft timing correlation, bank 1 sensor B
The exhaust-camshaft and crankshaft signals on bank 1 are outside their expected relationship.
2019 Volkswagen Golf Reliability and Buying Guide
A buyer-focused view of the 2019 Golf Mk7.5, covering TSI/TDI engines, DSG servicing, cooling, electronics, and inspection.
BMW B47
A more mature BMW four-cylinder diesel with improved timing architecture but continued emissions and service sensitivity.
C1130: Chassis control or suspension pressure fault
A chassis or suspension control module has detected an implausible pressure, height, or control-state 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.
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.
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.