My 1999 V70 non-turbo (built January 1999) threw a code yesterday. An Autozone guy (who owns a Volvo S80) read the codes for me and tracked it down to the rear (after cat) oxygen sensor. I think the code description was Threshold Bank 1 Sensor 2. He then got the readouts and graph on screen for the rear oxygen sensor and said it was way off base.

But, I'm finding more than one direct fit Bosch numbers for the car. Autozone's site shows both a 15062 and a 15035 for the car. Other sites show that the 15062 is for a 1998 V70. Eeuroparts shows both a 15035 and 16197 for the car, but on the phone they said the 16197 was a mistake because it was for a turbo model. Tasca shows the part available, but does not give a part number that I can find. The local dealer can order one based on the VIN, but don't know the Bosch number and they value it at $252.

Any advice on picking the right one? I don't intend to do a universal because I don't want to mess with the wires. Are there more than one engine control systems on this type of car that take different O2 sensors?

Thanks,
Charley

15035 appears to be correct for a NA engine. FCP has one for $145:

http://www.fcpeuro.com/products/volvo-oxygen-sensor-rear-s70-v70-234-4734

Thanks Klaus. That number seemed to show up more often than the others. I guess because I have an old browser on my computer, the FCP site won't run. It will open, it just doesn't respond with any information. Unfortunately, my general computer knowledge is no better than my knowledge of computer operated cars.

I crawled under the car but couldn't see a number on it. It does seem odd to me that the rear O2 sensor is located in the front 6 inches or so of the cat instead of near the rear of it.

Charley

I can't help with the part numbers, but I can tell you that I recently was having problems with the front sensor on our '95 854T.
I pulled the sensor and cleaned it by soaking in gasoline and gently scraping the crud off it.
Put it back together and so far (though only 500 miles later) there's no code. And the car seems to be running smoother.
I guess what I'm saying is maybe it's worth trying to clean your existing sensor.

--
"Differences of opinions should be tolerated, but not if they're too different" - Sharon Craig

Thanks. I think when I was looking through old posts I ran across your story with the O2 sensor. I will think about it. But, on my 940 I had a battle with a check engine light that would come on about 75 miles after every attempted repair. The end result was that it burned a valve before I figured out it needed of a mass airflow sensor. So, I'm a little gun shy now.

Charley

I ordered a Bosch 15035 on ebay for $89. It looked like that was going to be a hard price to beat. There were 3 (now 2) available if someone else needs one.

Charley