OBD-II code · Powertrain (generic)
P0176 Fuel Composition Sensor Circuit Malfunction
The ECU detects an electrical fault in the flex-fuel composition sensor circuit. The sensor measures ethanol content (E0–E85) in the fuel; signal missing, shorted or out of plausible range.
Is it safe to drive with P0176?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyFlex-fuel sensor failed
- PossibleWiring or connector fault
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2 h
- Emissions test
- Likely to fail
- Parts involved
- Flex Fuel Composition Sensor, Sensor Wiring
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.