B0239

Air Flow Control 1 Circuit Performance

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$33–167 (est.)

Symptoms

Unstable idle
Reduced engine power
Increased fuel consumption
Check Engine Light Illuminates

Causes

Open/short circuit in wiring harness
Faulty VVT or EGR solenoid
Throttle valve contamination
Problems with power or circuit ground
Mechanical damage to air control system components

How to Fix

Check the condition of the wiring harness and contacts in the control circuit
Test solenoid resistance (VVT/EGR)
Clean the throttle valve and check its operation
Check scanner control circuit parameters
If necessary, replace faulty components

Related codes

P0010 P0011 P0012 P0401 P0505