I just bought a used 2018 XC90 T6 AWD 45,000 miles, great car, very happy with it. It has a check engine light and is giving me a P2096 when I scan it. Car runs perfectly fine. Seems to be a rear O2 sensor which the dealership said is not covered under the emissions warranty - which I found odd. Almost $1,000 to replace it. Has anyone else had experience with this error and would it be something I can replace myself for less? I'm quite comfortable replacing spark plugs, minor components etc, but never replaced an O2 sensor.

I did search the forums for this and couldn't find someone's guide that was mentioned so please point me in the right direction if I'm missing it.

Anything else I should be on the look out with this engine and car?

 

I thought Emission warranties were for 8 year - X miles -

Have you sought a second opinion?

I did not read this article in detail -

https://jalopnik.com/advisor/volvo-warranty/

 

the rear O2 sensor's job is to measure your catalytic converter's efficiency. Yes you can replace an O2 sensor on your own (OEM part will be in the $150 range) - it just screws into the exhaust aft of the cat and plugs into a connector up on the firewall. While that sounds easy enough, the problem is getting access to the connector. As to the quote, my guess is your car requires removal of multiple parts to access the sensor (like removing a transmission cross member, exhaust pipes and even the converter itself.

One more thing - The P2096 code indicates a fuel trim problem. That doesn't mean your sensor is bad, it means the signal the sensor is returning is out of the expected range. The sensor only measures oxygen levels in the exhaust so problems like vacuum leaks, exhaust leaks, EGR system issues etc can set off a fuel trim code.

My advise would be to google around for other forum posts on the P2096 code and get that second opinion and ask for some diagnostics on fuel trim issues.

 

They told me sensors are considered consumables so are not covered under warranty. I think that's absolutely BS but I'm not sure what else to do.

 

I hope it's not a bigger problem. I also had to replace a torn torque rod which I had no idea was even a component. I have a friend who has a lift so I may ask if I can borrow it to replace the sensor myself. It seems intermittent, so I'm hoping by swapping it out the problem gets fixed.

 

Sorry I was wrong - it's not on Volvos list of stuff that's covered after 4 years. What's the problem with the O2 sensor? What codes appear? O2 sensors have heaters in them - and the heaters do go bad. A rear sensor will have no effect on how the car runs. It simply reports if the catalytic converter is working properly.

 

The work order says:

CODES ECM-P227000 02 STUCK LEAN, ECM-P209600 POST CAT FUEL TRIM

 

Here's what Volvo suggests could be the possible cause of those 2 codes

 

Thanks, I'm wondering if I should go ahead and replace the rear O2 sensor?

 

I think hoonk's post suggests a few things to do before you start in on replacing sensor like inspecting the wiring from the sensor up to the connector, pop off the connector and inspect for corrosion, clean the contacts with some electronics cleaner and then reset the code and see if it comes back. I'd also check around for any possible air leaks in the intake tubing or exhaust (a common cause to false positive O2 codes). if you need to source a sensor, you can check out Volvo friendly web stores like FCP or IPD USA or shop a dealer store and get an OEM part (I use Tasca Parts who are here in New England plus they have great prices for Genuine Volvo but there are others). You can check a dealer parts site to get the Volvo parts number then google for stores. Post up how you make out.

 

Thanks. I'll start running through those but from what I'm reading from my research it seems to be a pretty common problem with at least T6 (possibly T5) engines that the rear post cat O2 sensor gets dirty and needs replaced. I usually only use OEM/Bosch parts but I think I may use the OE equivalent Denso O2 sensor as others seem to say it's the same as the Volvo part at half the price. $144 vs $900 and the repair doesn't look too difficult according to this guide on the Swedespeed forums.

https://www.swedespeed.com/threads/v...iy-spa.640661/

The part:
https://www.densoproducts.com/denso-...-oxygen-sensor