P0178
Fuel Composition Sensor Circuit Low
P0178 is an OBD-II diagnostic trouble code meaning: Fuel Composition Sensor Circuit Low. Common causes: fuel composition sensor malfunction, open or short circuit in the sensor circuit. Estimated repair cost: $56–167.
Symptoms
- Check Engine light comes on
- Reduced engine power
- Increased fuel consumption
- Unstable engine idling
Causes
- Fuel composition sensor malfunction
- Open or short circuit in the sensor circuit
- Poor contact in the sensor connector
- Problems with the ECU
How to Fix
- Check the continuity of the fuel composition sensor circuit
- Inspect the sensor connector for corrosion or damage.
- Replace the fuel composition sensor if necessary
- Check the operation of the computer
Related codes
Error P0178 by Vehicle Brand
FAQ
What does the P0178 code mean?
P0178 is an OBD-II diagnostic trouble code that indicates: Fuel Composition Sensor Circuit Low
What causes a P0178 error code?
The most common causes of P0178 include: Fuel composition sensor malfunction; Open or short circuit in the sensor circuit; Poor contact in the sensor connector; Problems with the ECU.
How do I fix a P0178 diagnostic trouble code?
To fix P0178: Check the continuity of the fuel composition sensor circuit. Inspect the sensor connector for corrosion or damage.. Replace the fuel composition sensor if necessary. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0178?
Limited driving only, diagnose soon
How much does it cost to fix P0178?
The estimated repair cost for P0178 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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