Sorry in advance if this has come up already but i read through a ton of forums and havent found anyone with previous problems with the cats other than a while back i recall guys with the supercharger were having problems. I have an 05 TL with the E-Shift Pro Cats installed. I've had them on there for over a year now and have had zero complaints til about 3 days ago when the check engine light came on. I took it into the shop and the code that was flipped was for one of the cats suggesting its not operating at regular efficiency. Just curious if anybody else has had a problem with this. As of now they are doing a diagnostic to dig a little deeper, i'll keep you guys posted though as to what comes up. Any help will be appreciated.

 

it can be a bad sensor, the SC guys had problems becuase to much fuel soaked the cats and they started coming apart.