P0169 - Incorrect Fuel Composition

The ECM detected a fuel composition reading that does not match expected values.

Code Overview

The ECM detected a fuel composition reading that does not match expected values.

Common Causes

• Contaminated fuel
• Fuel composition sensor fault
• Wiring or connector issue

Diagnostic Steps

1. Check fuel quality if contamination is suspected
2. Inspect the sensor connector and wiring
3. Compare fuel composition data to known fuel type

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.