The EGR System tends to get restricted or blocked with carbon after 100,000- 125,000 miles which will cause an emissions test failure for NOX. If the EGR system is equipped with an EGR temperature sensor it will trigger a Check Engine Light for improper EGR flow. The repair is to clean out the EGR passages and the EGR Temperature sensor. Our technicians tell this repair is pretty straight forward and takes about 1-1.5 hours. It is also wise to verify the EGR system components i.e. the Transducer, EGR Valve and VSV Solenoid at this time.
Average mileage: 194,490 (130,000–233,450)
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I just bought the truck and ran the code for the check engine light. The scanner said it was EGR. Can I clean it or does it have to be replaced?
Can't find solution yet. Have replaced all three components with no improvement of PO401 check engine code. Passageways are clear. Problem appeared at 150k miles.
EGR fail with debris in intake manifold
Failed emissions due to nox gas