I own a 1994 940 wagon and recently the check engine light came on. I noticed that I was getting 16 mpg so I pulled codes.
I picked up codes 113 and 212 on the A2 port. As I understand it these indicate a bad oxygen sensor. However, I also picked up code 122 from the B3 port. I cant seem to find anyplace that lists this code and what it means. Any ideas?

And something else... When popped the hood, I noticed that the oil stick was pushed up and there was oil all over everything. Over the summer I checked the flame guard and it was clean. what else cold cause this to happen?

 

I did a little more research and apparently there is a lot more that can be cleaned out besides the flame trap. Hopeully that will solve the problem.

 

Could be your crankcase ventilation system?
I believe that Code 122 is air temp sensor.

 

Thanks, I'll check it out.