Fuel Temperature Sensor B Circuit Intermittent

Where it lives

For P0189, the circuit described runs through the sensor. The description of P0189 reports a fault at the sensor.

Check these first

• A loose sensor B connector
• Chafed wiring on the sensor B circuit
• A failing sensor B element
• Water intrusion in the sensor B connector
• A poor ground for sensor B

What to do next

1. Wiggle test the sensor B harness on live data
2. Inspect the sensor B wiring for chafing
3. Check the connector for water intrusion
4. Replace fuel temperature sensor B if erratic
5. Clean the connector and ground
6. Clear the code and retest

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