Whenever I drive my 94 850 turbo on an upward road, it seems like the car looses power then comes back to and repeats until I give it more gas. I am wondering if this could be due to the fault codes that I pulled from the OBD2 which said Bank 1 Lean and O2 Sensor Heat Circuit Fault Bank 1.. or something else. I plan to change the plugs regardless but any insight would be helpful. Are there any lower priced sources for buying new O2 sensors than Advanced Auto Parts? Is the Bank 1 O2 sensor located in front of the motor? My guess is that the O2 sensor is far gone because the check engine light bulb is blown out along with a bunch of other indicator bulbs meaning its been on for some time now..

 

I don't think you should get your O2 sensors from Advanced Auto. Search the pages to see where people get them. If you don't get OEM sensors, get used ones from a junk yard.

Both O2 sensors are on the exhaust. One before the cat and one after.

A lot of people pull the cel bulb when they sell the car so there might not be a bulb in the socket.

You may be loosing power under a LOAD because your wires are worn/faulty. How old are the wires? If they are oem wires, they have a date on them. Month and year.

Also check your vacuum lines.

 

The plug wires are OEM volvo and say (02 06) on them. Is that Feb 2006 or June 2002? I guess that I will start with my spark plugs and see if that helps..

 

I apologize. The wires have the week / year. So your wires were made the 2nd week of 2006. They should be good unless you have over 100k on them.

 

Hmm...I never thought that plug wires can create this kind of problem. Can anyone verify that? If it really is possible, then I might have to change my wires too.

I have been experiencing a very small hesitation going up on hills. It's so small that when other people drive my car they don't even notice it.