Engine Error
P0177
Flexible Fuel Sensor Circuit Range/Performance
Severity
Medium
Symptoms
Hard starts on cold mornings, rich or lean running condition
Common Causes
- Contaminants blocking the flex fuel sensor
- Internally failing flex fuel sensor
- Voltage drop in the sensor wiring
- PCM calibration issue
How to Fix
- 1 Remove and clean the sensor
- 2 Replace the flex fuel composition sensor
- 3 Test and repair the 5V reference circuit
- 4 Reflash PCM software
Estimated Repair Cost
USD
$100
–
$400
Sensor replacement: 150 - 400