P239A

Diesel Intake Air Flow B Position Sensor Circuit Intermittent/Erratic

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$28–89 (est.)

Symptoms

Unstable engine operation
Power reduction
Increased fuel consumption
Check Engine Light Illuminates
Problems with the EGR system

Causes

Damage to the sensor wiring harness
Poor contact in the sensor connector
Malfunction of the position sensor itself
Short circuit in the circuit
Circuit Grounding Problems

How to Fix

Check the integrity of the sensor wiring harness
Clean and check the contacts in the connector
Test sensor resistance
Check the voltage in the sensor circuit
If necessary, replace air flow position sensor B

Related codes

P239B P2399 P2398