2005 T6 O2 Sensor Replacement

dgb049 · Post by **dgb049** » 08 Jan 2010, 19:57

I got the CEL and found P0030 (O2 sensor) on my 2005 Volvo XC90 T6, 46,000 miles.

I can get to the sensor from the engine compartment. However the wires disappear after the first 12" of wire. It is difficult to find where they go - there's hoses / pipes / etc, can't see, can't get your hand in there.

Question #1 - The Volvo OEM part is really expensive, the Bosch is $150, and some generic's can be had for $40. What is the difference? Should I just splice in a cheapie? If I splice where can I find the color coded wiring diagram?

Question #2 - It seems the easiest to cut the wires and splice the new sensor, rather than get under the car and find where the 02 sensor plugs in. What do you think of this?

dgb049 · Post by **dgb049** » 22 Jan 2010, 09:34

I wound up purchasing a Denso 234-5701 for about $200. It's an exact replacement (5 wires).

I spent about 90 minutes trying to get at the connector. Removed the air box, etc. But you just can't get to it. You need to be under the car, and I believe remove the skid plate.

So I just spliced the wires onto the new O2 sensor with butt connectors and heat shrink tubing. Works fine.

Alejandro · Post by **Alejandro** » 27 May 2020, 03:51

How many sensor is have Volvo XC90 t6 2005

Post by **SuperHerman** » 27 May 2020, 11:29

As I recall four sensors - two upstream and two downstream. Upstream should be accessible from above, while the downstream from below the car.

The wire is routed with clips is my recollection - one just needs to find the start point and end point and follow the wire. I wouldn't do any cutting as it takes more time than doing it right and creates a problem spot that just isn't needed.

Denso and Bosch are both reliable brands (some say they are from the same factory). All others I would not waste my time installing. Buy from a reputable place (I received a fake branded Denso off eBay for a Subaru and it cost me big time chasing wires - over a week). There are many posts on countless forums of people regretting O2 sensor and MAF purchases at prices points too good to be true.

Post by **RickHaleParker** » 27 May 2020, 13:26

Three total. Two upstream - three front cylinders and three back cylinders. One downstream at the one and only catalytic converter.

Post by **SuperHerman** » 27 May 2020, 19:02

Good to know RickHaleParker on the 1 downstream.

Anyway you can pull of some of your magic and find a wire routing diagram for the two front to help out the poster in his/her efforts?

Alejandro · Post by **Alejandro** » 28 May 2020, 08:12

Thank you so much for the help going to try getting ready for car inspection