What does code P0178 mean?
Low signal detected from the fuel composition sensor indicating incorrect ethanol content reading
OBD-II Code
P0178 — Fuel Composition Sensor Circuit Low Input
Low signal detected from the fuel composition sensor indicating incorrect ethanol content reading
Common symptoms
- Reduced power
- incorrect mixture
Possible causes
- Signal wire shorted to ground
- faulty sensor
Initial recommendation
Inspect wiring, measure voltage and replace sensor if necessary.
Safety notice
This information is for guidance only and does not replace a physical vehicle inspection or diagnosis by a qualified mechanic. If the vehicle has severe power loss, smoke, a fuel odor, overheating, brake or steering problems, or any unsafe behavior, avoid driving it and seek professional inspection.
Analyze this code with MecaOBD
Use the app to combine code P0178 with your vehicle's actual symptoms for more complete diagnostic guidance.
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