Diesel Intake Air Flow B Position Sensor Circuit Intermittent/Erratic

Where it lives

For P239A, the sensor sits on the circuit this code reports. The description of P239A reports a fault at the sensor.

Check these first

• An intermittent open or short in the intake air flow B position sensor circuit
• Carbon or oil on the intake air flow B position sensor
• A loose intake air flow B position sensor connector
• A failing intake air flow B position sensor element

What to do next

1. Read the diesel intake air flow B position sensor on a scan tool while wiggling the harness
2. Inspect the position sensor connector for carbon, oil, or water
3. Test the position sensor circuit for an intermittent fault
4. Clean or replace the intake air flow B position sensor if contaminated
5. Clear the code and retest

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