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.
Affected components
- Flex fuel composition sensor
- Sensor wiring
Common causes
- High likelihood: Flex-fuel sensor failed
- Medium likelihood: Wiring or connector fault
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.