P0177 - Fuel Composition Sensor Circuit Range/Performance

The fuel composition sensor signal is outside the expected range.

Code Overview

The fuel composition sensor signal is outside the expected range.

Common Causes

• Failed sensor
• Contaminated fuel
• Wiring issue

Diagnostic Steps

1. Check sensor data for stability
2. Inspect wiring and connector condition
3. Confirm fuel quality if contamination is suspected

Likely Repairs & Cost Guides

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

Related OBD Codes

Browse the closest code-family pages when the same fault pattern often shows up nearby.

Next Steps

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