Hi guys, I have a
1991 850i. Recently, I've been getting the CATALYST OVERHEAT error on the
OBC/MID, complete with tone/beep, immediately after starting the car. Happens
regardless of cold/hot, and this is not the quick 2 second one that J-Spec
owners see that disappears right away. The Euro/JSpec cars have after-cat
temperature
sensors,
part numbers: 11 78 1 722 763, or 11 78 1 738 347. Don't want to throw parts
at this, otherwise I would have replaced the sensors by now in hopes of it
fixing it, but I would rather try and troubleshoot/diagnose this to make sure
it's the sensors and not something else.
Anyone ever deal with
this?
Info: 1991 J-Spec 850i, Automatic -Just passed emissions testing
recently with great results -Air filters and sparkplugs(F8LCR) are new, will be doing caps+rotors soon, but since the error
comes on instantly, I do not believe this to be an ignition/rich
issue -Behaves the exact same way with both sensors plugged in, both
unplugged, 1 unplugged, other unplugged.
thanks! -Andrew
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