Check engine - Code 422

[AaronA]

I have a 2001 V70 2.4T. The check engine light just went on and I went to Auto Zone to have it read. They pulled up code 422.

Is that a catalytic code? Searching on-line I read that the Volvo codes and the standard codes are different and the 422 can mean different things. On the list of codes on this site (for 99+ models), there was no 422 listed.

Any ideas what it mean and any ideas how to fix it?

Thanks!

[brandonbeach14]

Usually the aft O2 Sensor, but could be the front one as well. Does the code read or specify Bank 1 or 2? The rear sensor is about $60 cheaper than the front. The cheapest place I have found them is on the FCP Groton site above. You should also check the Cat, look for corrosion, and tap on it. If you get a metal clanking noise, it's likely okay. But if you hear a thud, the Cat is likely bad. Many auto parts stores will read the code to give you a further breakdown. You can also search for the P0422 code on the main page of the 2001-2010 V70 forum in the "Search this topic.." box. This will pull up several previous posts for the P0422 code to help you get it fixed too. Good Luck.