Check Engine Light Due to Restricted EGR System on Toyota Land Cruiser

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.

RepairPal Verified
Average mileage: 203,490 (130,000–239,000)
8 model years affected: 1990, 1991, 1992, 1993, more1994, 1995, 1996, 1997
15 people reported this problem
4 people shared problem details
Failed emission with high nox. Clean EGR (that's what mechanic said). Still failed.
EGR fail with debris in intake manifold
Failed emissions due to nox gas
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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