Fuel Composition Sensor Circuit Range / Performance
The flex-fuel composition sensor signal is within electrical limits but does not match expected values for the current fuel mix or rate-of-change is implausible.
Affected components
- Flex fuel composition sensor
Common causes
- High likelihood: Sensor drifted out of calibration
- Medium likelihood: Fuel contaminated (water, dirt)
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.