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Discussion Starter #1
Happy New year to everyone. My 2011 XC60 T6 with 150K miles threw a P0420 code, my hand OBII wouldn't clear the code so I hooked up VIDA and sure enough the ECM fault code "Catalyst System Efficiency Below threshold (bank 1)" was there. Funny enough I was not able to delete the code using VIDA, most times a failing O2 sensor will throw this code and you can clear it and then the code will come on again somewhere in the imminent future but I can't understand why I can't clear it? When I click Erase All I get a communication fault message, car not responding? I'm assuming I will have to purchase a new downstream o2 sensor but can anyone shed any light on why I cannot clear the code?
 

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These cats are known to fail after 7 or so years. Mine did and it was replaced under warranty. At first I cleared the P0420 thinking it was a one time glitch then it came back a couple of months later so I got it replaced.

I think your warranty expired so you may want to consider an aftermarket high flow cat for better performance. It may be cheaper than OEM too.
 

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Discussion Starter #3
Thanks for the response, I find it strange that the dealer would replace the Cat before changing the sensor?
 

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I think they tried to pull one sensor and it was stuck. Good dealerships love warranty work. Make a meal of it.
 

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Discussion Starter #5
I ordered a new sensor for less than $100. It was fun removing the old one, heating it up with a propane torch did the trick. After installing the new sensor I disconnected the battery for 10 minutes to clear the code and so far so the engine light has remained off.
 
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