P0179 - Fuel Composition Sensor Circuit High Input

The fuel composition sensor signal is higher than expected.

Code Overview

The fuel composition sensor signal is higher than expected.

Common Causes

• Sensor fault
• Short to voltage
• Connector or wiring issue

Diagnostic Steps

1. Check signal voltage with the key on
2. Inspect connector condition and wiring
3. Compare fuel composition readings to expected values

Likely Repairs & Cost Guides

Use test results to confirm the fault before pricing the repair.

Related OBD Codes

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Next Steps

Move from the code to a diagnosis path, then into repair pricing once the fault is confirmed.