1995 850 na

A1 1-1-4
A2 2-1-2
A3 1-4-2

I reset the codes after I read them this morning. I'm thinking that the A2 code is the one bringing up the check engine light (O2 sensor). I had both sensors replaces about 2 years ago, and did not expect one to go bad so soon.

I went to Bay 13 and checked out the instructions to replace the front...is it very hard? Is it worth it to get the Bosch sensor?

Thanks for your info...Bob

I would get the Bosch at the very least if not the actual sensor from Volvo. The hardest part is getting the connector loose up where it attaches ontop of the trans bell housing. The plastic is usually real brittle and will break, the good news though is that the new sensor comes with a new plastic retainer. The little clips that hold it down to the top of the engine mount cover can be a pain in the ass too. If you break or destroy them in the process you can usually do what you need to retain the harnesses with a couple of zip ties.

Good Luck,
Mark