If it's sub 10C, CEL stay on, If it's warmer I get no CEL.

Got it scanned and I forgot the exact code but the mechanic said O2 sensor bank 1.

I got a second opinion from my mechanic and he said it can be a clogged cat.


My car is from 2008 and has just under 110,000 miles.
Is the bank 1 sensor accessible from the engine compartment?

Can a clogged cat cause a temperature related CEL?

 

It could be a lot of things, but the sensor is easy and cheap to replace.

Whats the code?

 

I can't remember at the moment but should I go OEM or Aftermarket for the sensor?

 

The cat's don't work until they are warmed up so the sub 10C might be the reason it's being triggered. I honestly suggest running a can of seafoam through the engine to help clean out the cats if they are clogged, an easy $10 dollar solution.

If you still have the issue, go OEM with new O2 sensors. Some guy in the black market section is selling his factory cats for around $125 if I remember correctly.