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: 194,612 (130,000–233,450)
14 people reported this problem
3 people shared problem details
1994 Toyota Land Cruiser225,000Visitor
EGR fail with debris in intake manifold
1993 Toyota Land Cruiser233,450Visitor
Failed emissions due to nox gas
1997 Toyota Land CruiserVisitor
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.
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