Porsche 911 diagnostics
Public library of published fault codes: description, symptoms, probable causes, checks to perform, related parts and direct access to the AI assistant.
Probable causes : timing adjustment; Variocam actuator; camshaft sensor; incorrect engine oil; wiring harness
Checks to perform : Read actual values; check oil; check connector; check timing; test actuator
System: Engine — Camshaft position relative to the crankshaft out of range on bank 1.
Probable causes : used oil; Variocam solenoid valve; camshaft sensor; timing
Checks to perform : Check oil level and quality; read the Variocam instructions; check the connector; verify the timing
System: Engine — Camshaft position sensor 1 is delayed or inconsistent.
Probable causes : timing adjustment; Variocam actuator; camshaft sensor; wiring harness
Checks to perform : Read actual values; check connector; verify alignment; test actuator
System: Engine — Camshaft position relative to the crankshaft out of range on bank 2.
Probable causes : oxygen sensor; fuse; wiring harness; connector; control module
Checks to perform : Check fuse; measure heating power supply; check connector; replace sensor if confirmed
System: Engine. Fault in the heating circuit of the oxygen sensor located upstream of the catalytic converter, bank 1.
Probable causes : oxygen sensor; wiring harness; connector; heater power supply
Checks to perform : measure power supply; check continuity; check connector; read sensor readings
System: Engine. Fault in the heating circuit of the oxygen sensor located after the catalytic converter, bank 1.
Probable causes : oxygen sensor; wiring harness; fuse; connector
Checks to perform : Check power supply; measure heater resistance; check connector
System: Engine. Fault in the heating circuit of the oxygen sensor located upstream of the catalytic converter, bank 2.
Probable causes : oxygen sensor; wiring harness; power supply; connector
Checks to perform : Check power supply; measure heater resistance; check connector
System: Engine. Fault in the heating circuit of the oxygen sensor located after the catalytic converter, bank 2.
Probable causes : clogged MAF sensor; air intake; air filter; wiring harness; connector
Checks to perform : Check the intake; clean or check the MAF sensor; read the MAF values; check the air intake
System: Engine — MAF sensor signal is inconsistent or out of range.
Probable causes : MAF sensor; connector; open circuit in the wiring harness; air intake
Checks to perform : Check connector; measure power supply; read actual values; check wiring harness
System: Engine MAF sensor signal too low.
Probable causes : MAF sensor; short circuit; connector; control unit
Checks to perform : Inspect the wiring harness; measure the signal voltage; check the connector
System: Engine — MAF sensor signal too high.
Probable causes : air temperature sensor; wiring harness; connector; short circuit
Checks to perform : Check connector; read intake temperature; measure resistance
System: Engine: Low signal from the intake air temperature sensor.
Probable causes : air temperature sensor; open circuit in the wiring harness; connector
Checks to perform : Read intake temperature; check connector; test for continuity
System: Engine — High signal from the intake air temperature sensor.
Probable causes : engine temperature sensor; connector; wiring harness; air in the system
Checks to perform : Read the engine temperature when the engine is cold; check the resistance; check the connector
System: Engine — Engine temperature sensor fault.
Probable causes : short circuit; sensor; wiring harness; connector
Checks to perform : measure resistance; check wiring harness; read actual values
System: Engine — Low signal from the engine temperature sensor.
Probable causes : open circuit in the wiring harness; sensor; oxidized connector
Checks to perform : Check connector; measure resistance; read cold value
System: Engine — High signal from the engine temperature sensor.
Probable causes : throttle body; position sensor; wiring harness; throttle adjustment
Checks to perform : Adjust the throttle; check the connector; read the throttle angles
System: Throttle signal or potentiometer out of range.
Probable causes : throttle position sensor; wiring harness; connector; throttle body
Checks to perform : Check power supply; read values; check connector
System: Engine: Low signal from the throttle position sensor.
Probable causes : throttle position sensor; short circuit; wiring harness
Checks to perform : Check signal voltage; check wiring harness; read throttle position value
System: Engine: High signal from the throttle position sensor.
Probable causes : oxygen sensor; air intake; fuel mixture; wiring harness; exhaust leak
Checks to perform : Read lambda values; check for exhaust leaks; check the connector
System: Engine — Front oxygen sensor signal before the catalytic converter on bank 1 is inconsistent.
Probable causes : aging sensor; exhaust leak; contamination
Checks to perform : Check probe oscillation; check for exhaust leaks; compare test results
System: Engine — Slow response of the pre-catalyst oxygen sensor on bank 1.
Probable causes : oxygen sensor; air intake; fuel mixture; wiring harness; exhaust leak
Checks to perform : Read lambda values; check for exhaust leaks; inspect the connector
System: Engine — Front oxygen sensor signal before the catalytic converter on bank 2 is inconsistent.
Probable causes : aging sensor; exhaust leak; contamination
Checks to perform : Check probe oscillation; check for exhaust leaks; compare test results
System: Engine — Slow response from the pre-catalyst oxygen sensor on bank 2.
Probable causes : oil temperature sensor; wiring harness; connector
Checks to perform : Check oil temperature; measure resistance; inspect connector
System: Engine: Low signal from the oil temperature sensor.
Probable causes : oil temperature sensor; open wiring harness; connector
Checks to perform : Read oil temperature; check wiring harness; measure resistance
System: Engine — High signal from the oil temperature sensor.
