The P0406 code is the result of the exhaust gas circulation (EGR) sensor “A” having a high circuit voltage. This code is set when the ECM identifies the EGR voltage is higher than the specified range, thus triggering the check engine light to illuminate on the vehicle dashboard.
P0406 Symptoms
Check engine light
Increased production of NOx emissions
Decreased engine performance
Engine stall
Engine pinging upon acceleration or higher speeds
Lower fuel economy
P0406 Causes are
Faulty EGR valve sensor
Open/Shorted EGR sensor circuit
Dirty EGR valve
Disconnected wiring in EGR circuit
P0406 - DYI Steps to fix it
STEP 1: CLEAN EGR VALVE.
Use your car’s service manual to locate and check the EGR valve for any carbon buildup. If you find carbon buildup, use a speedometer cable and throttle body cleaner to remove carbon blocking any air passages. Use a scanner to clear your check engine light. Go for a test drive and see if the check engine light turns back on. Check out this video for a visual reference.
STEP 2: CHECK EGR VALVE WIRING.
Conduct a visual inspection of the EGR sensor circuit for shorts, open, high resistance or disconnected wires. Like a potentiometer the checks are the same. Find out more about how to test POTENTIOMETER sensors here.
STEP 3: STILL NEED HELP FIXING P0406 CODE? CONSULT US.
Having lots of 5-star rating reviews don’t hesitate to visit the Adei-yie shop for further diagnosis, if you can’t fix the above issues yourself. Adei-yie does not only help you figure it out or fix your car quickly but also stands behind all estimates guaranteeing fair pricing & 4,000-mile warranty for all replacement parts.
Please note that Adei-yie technicians can bring the dealership to your doorstep, performing car services at your home or office 7-days a week between 8 AM-6 PM. We currently cover all regions
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