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Old 07-04-2013, 02:01 PM   #1
YJ1990rav's Avatar
Join Date: Jun 2011
Posts: 4
Fail smog/exhaust leaks?

I have a 1990 yj 2.5L and i failed my smog, excessive NO almost triple the max amount. I found 2 exhaust leaks. One under the manifold right below the o2 sensor and another just before the cat where i welded the bracket for the pipe. Can this cause me to fail smog solely or is it my cat also?
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Old 07-04-2013, 02:27 PM   #2
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Yes an exhaust leak with a bad reading by an O2 sensor will cause problems.

This is an excellent website with great info and will help you out.

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Old 07-04-2013, 02:30 PM   #3
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Alright cool, i will check that out. Thanks
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