Fault Code P0178
Code meaning, symptoms, possible causes, part number, and estimated cost.
P0178
Fuel Composition Sensor Circuit Low Input
This code indicates low voltage in the fuel composition sensor circuit, affecting the ECM's ability to determine the correct air-fuel ratio.
Part Details
Part Name
Fuel Composition Sensor
Reference P/N (OEM)
N/A
General part number for this fault code — not necessarily for your specific vehicle
Estimated Cost
₪400 - ₪1,200
Engine Location
Fuel system
Symptoms
- Poor engine performance
- Hard starting
- Increased fuel consumption
- Check Engine light on
Possible Causes
- 1Defective fuel composition sensor
- 2Short to ground in the sensor circuit
- 3Damaged wiring or loose connectors
- 4Contaminated fuel
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