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 4Runner
Average mileage: 188,537 (100,000–360,000)
26 people reported this problem
Viewing 1 - 6 of 6 comments
lack of power and check engine code 71 egr clogged.
nox failure, they told me both nox need replacing.. Cost? can I fix? Thanx
cleaned out egr after failing emissios. hope it works
check engine light on...mechanic says i need a new EGR vacuum solenoid or modulator. light came on after running redline fuel system cleaner
I started the car drove 2 mils before getting on freeway. About 1 mile into accelerating to proper speed check engine light comes on. I have had my timing belt replaced recently.
Code 71. Still has not been repaired.