DTC P0177-40: Fuel Composition Sensor Circuit Range/Performance - Reserved by document: Action
- Prioritized Checks to Perform
- Refer to the electrical circuit diagrams and check the flex fuel sensor power and ground circuits for open circuit, high resistance. Check the electrical connectors for evidence of water ingress. Check the terminals for damage and corrosion. Repair the wiring harness as necessary
- Refer to electrical circuit diagrams and check the flex fuel sensor signal circuit for short circuit to ground, short circuit to power, open circuit, high resistance. Check the electrical connectors for evidence of water ingress. Check the terminals for damage and corrosion. Repair the wiring harness as necessary
- Install a new flex fuel sensor