I am getting #52 (knock sensor) and #71 (EGR system) codes. I can’t find solutions for these repairs, any suggestions?
Feb 18, 2023 at 11:38 AM
OBD codes 52 and 71?
1995 TOYOTA 4RUNNER
JAMESA33
- MEMBER
- 1 POST
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STRAILER
- ✓ASE Certified Mechanic
- 54,832 POSTS
Hello James,
These codes come up when the EGR valve or ports that feed the valve are clogged or the valve is not working, I would remove the EGR and use a flashlight it inspect the ports also while the valve is off. use this video to test the valve. Also check the vacuum line to the valve:
https://youtu.be/DqUCbbKdWf4
Here is the location of the valve in the images below. Please let me know or upload images of the problem.
These codes come up when the EGR valve or ports that feed the valve are clogged or the valve is not working, I would remove the EGR and use a flashlight it inspect the ports also while the valve is off. use this video to test the valve. Also check the vacuum line to the valve:
https://youtu.be/DqUCbbKdWf4
Here is the location of the valve in the images below. Please let me know or upload images of the problem.
Image (Click to enlarge)
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Feb 19, 2023 at 9:42 AM
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