P0176
PowertrainFuel Systemlow severityFuel Composition Sensor Circuit
What P0176 Means
Malfunction in the fuel composition sensor circuit, used in flex-fuel vehicles to detect ethanol content.
Symptoms
- Check Engine Light
- Poor driveability on E85
- Incorrect fueling for fuel type
Common Causes
- Faulty fuel composition sensor
- Wiring damage
- Sensor contamination
Diagnostic Steps
- Test sensor output
- Inspect wiring
- Check for contamination
Where to start: Replace fuel composition sensor.
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