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.
Check Engine Light Due to Restricted EGR System on Toyota Land Cruiser
Average mileage: 194,490 (130,000–233,450)
15 people reported this problem
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.
1994 Toyota Land Cruiser 194,000 mi, Visitor
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?
1994 Toyota Land Cruiser 225,000 mi, Visitor
EGR fail with debris in intake manifold
1993 Toyota Land Cruiser 233,450 mi, Visitor
Failed emissions due to nox gas