Car Problem Reports

Toyota Corolla Failed Emissions Test Due to Blocked EGR System

Toyota Corolla Problem
26 Reports
Me Too

Model Years Affected: 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2004

Average Mileage: 185,604 mi (90,000 mi - 267,000 mi)


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.

  •  Rookie

    Engine Code P0401 showed up on my scanner. Just needed to replace the Vacuum Control Module. Cheap and easy. Love my car!

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  • Visitor, , 133,000 mi

    Egr.code p0401 corolla 97. Change egr vale egr modulatorclean intake still check engine light come back

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  • Visitor, , 191,524 mi

    egr restricted flow replaced all components

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  • Visitor, , 90,000 mi

    I am having toyato corolla 2004 I am suffering a problem at the time when car is stopped or not working for more than 5 to 6 hours there is problem like when we start the car it starts immediately but after half minute engine stoppes and than

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  • Visitor, , 204,000 mi

    Cleaned EGR but CEL still on:(

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  • Visitor, , 207,384 mi

    Running just fine, then hopping on the Interstate the Check Engine light came on. I am not aware of any running issues with this car.

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  • Visitor, , 207,017 mi

    Check engine light turned on. EGR valve completely clogged. Cleaned valve and reset engine light.

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