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
1995 Toyota 4Runner 228,000 mi, Visitor
lack of power and check engine code 71 egr clogged.
1991 Toyota 4Runner 100,000 mi, Visitor
nox failure, they told me both nox need replacing.. Cost? can I fix? Thanx
1990 Toyota 4Runner 215,000 mi, Visitor
cleaned out egr after failing emissios. hope it works
1992 Toyota 4Runner 150,000 mi, Visitor
check engine light on...mechanic says i need a new EGR vacuum solenoid or modulator. light came on after running redline fuel system cleaner
1997 Toyota 4Runner 360,000 mi, Visitor
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.
1994 Toyota 4Runner 135,000 mi, Visitor
Code 71. Still has not been repaired.