Codes 25 and 26 - 91 FJ80 (1 Viewer)

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Nov 13, 2017
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Jacksonville, NC
New owner of a 91 FJ80 with 203,000 miles on it. I’m a self-taught novice mechanic with most of my experience working on vintage BMWs, so these are new to me. Looking for some help on this one.

My CEL came on the other day. I just checked it tonight. It’s throwing codes 25 (lean mixture) and 26 (rich mixture). Anyone know why it could throw both at the same time?

I’m also throwing a 71 code, which from reading the 3FE manual is related to the EGR. The P.O. “de-smogged” the truck. I say that loosely because I’m still finishing the job.

Thanks in advance!
 

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