O2 sensor replacement

vooman · Post by **vooman** » 07 Mar 2011, 15:06

On a 2002 S60 2.4 what 's the procedure for replacing the rear O2 sensor? Please be gentle - I don't even know where it is.

Thanks!

Post by **JRL** » 07 Mar 2011, 15:08

Why do you think you need a rear 02 sensor?
The front is usually the one that goes bad
(and you need to have the car on a lift for the rear, can't see it or get to it from under the hood)

vooman · Post by **vooman** » 07 Mar 2011, 15:35

CEL was on - local shop said error code "442" which they say is the rear o2 sensor (another code was for a faulty gas cap). My cheap reader didn't return any code at all.

Is there any other way to check for go/no-go of the sensor(s)?

Thanks for the assist!

endothrow · Post by **endothrow** » 08 Mar 2011, 07:06

vooman- with the price of a dual-band O2 sensor, I would hold off on replacing that since there are lots of factors that can make an O2 sensor throw a code, namely the emissions system.

I am not sure of all the specifics of what to check, but I would trace the issue back to the engine and start checking with the cheapest thing first in the combustion process. How is the car idling if that O2 sensor has a code? Rough, missing?

Post by **jblackburn** » 08 Mar 2011, 09:29

P0442 is a code for the evaporative emissions system.

http://volvoforums.com/forum/showthread.php?t=5714

I would start by checking lines and elbows at the charcoal canister - look in front of your right rear wheel for the canister laying on its side.

vooman · Post by **vooman** » 08 Mar 2011, 18:51

It idles well, in fact it runs pretty smoothly at all times.

I'll check the canister and hose from the engine back.

Thanks all.