Cadillac Catera and Cimarron Forum Discussion, 01 Catera getting P0300 code in Past Cadillac Vehicle Discussion; The ECM I may need replacement is for the 2001 Catera. My 98 Catera is fine only have valve cover ...
the fuse block cover has a legend that says what's what
owners manuals often also have the same legend (in case the fuse block cover gets lost i guess)
'99-'01 do show that they're the same
as for programming, whoever is doing the work will best be able to answer those related questions
the part number you mention (90566574) does not register as a good part number for me
if you're getting that part number off of the module that would make sense but not really help much
often the part number on the module does not match the parts catalog service part number(s)
you could use it to match other '99-'01 ecms ... but i think they're all the same unless you've got an export engine/vehicle
and again, with a VIN we can take some of this guesswork out
Another update, car is still running a little rough and I think it's the throttle body and going bad. I did some cleaning of throttle body and after that it's running a little better but still RPM varies a lot. I turned off the CEL but it came back on again today and it's showing O2 sensors, bank 1 sensor 2 and bank 2 sensor 2 and no misfires. I ran a live data mode test with my code reader and it's reading the data for the O2s so not sure why the CEL comes on with O2 codes again and again.
Could a bad throttle body cause the O2s to act up? Any ideas?