I have a 94 850. The CEL is always on because of the a6 241 code "EGR flow too low". I dont fix this because I'm lazy and the car runs fine without it. So I check the codes on oil changes. Today I pulled a7 122 "temperature sensor signal too long" and a7 132 "no RPM sensor signal". From what I have read the car shouldn't run without a RPM signal, but it does. I cleared the codes but haven't driven enough to get them back. If they do comeback where should I start?

 

If they do come back, you will need to replace the temp sensor for sure. The RPM issue could be a couple things.

 

The temp gage is working fine and the car seems to be running at an alright temp. Is the sensor for something else? Also, do you have a bricks and mortar where I can pick up parts I'm on the road and will be in the area soon? Likely about the time I would expect those codes back. Could be a happy coincidence.