Hello everyone, I have a issue with my check engine light. First off, my vehicle is a 1995 Volvo 850 with a 2.3 turbo engine, that has 124,200 miles on it. I ran the codes through the Motronic 4.3 system and found three codes. Here they are:

1. 2-4-1 EGR System flow malfuntion
2. 2-1-2 Heated Oxygen sensor absent or faulty
3. 1-2-1 MAF sensor signal absent or faulty

 

I would first clear the codes and see if the same ones come back.

The O2 sensors probably need replaced. The Bosch O2 sensors do not seem to last as long as those by Denso. There should be 2 O2 sensors on the '95 turbo.

The EGR seems of poor design on the 850 and some people have blocked it off. The previous owner of my parted 850 had physically blocked one hose with a bolt. It either needs cleaned or replaced.

If the code for MAF sensor returns, you could either clean it or replace it. I would replace it if it were mine.

See what others have to say.


JPN