ALSO CODES 430 AND 420
I use this website all the time:
https://www.obd-codes.com/p0320
https://www.obd-codes.com/p0330
https://www.obd-codes.com/p0420
https://www.obd-codes.com/p0430
Now the art is knowing how to interpret, the P0320 and P0330 can set off your P0420 and P0430 oxygen sensor codes. I would address the P0320 and P0330 first and probably the O2 sensor stuff will probably go away. If your car is knocking, rough idle, loses power, etc. then the 300 codes make sense and you have issues. It could also be two separate issues were damaged wiring on the knock sensors and then a damaged catalytic converter. I've got a car that constantly throws up 420 and 430 codes because the catalytic converter got dinged up from running something other.
SOURCE: cadilac cts
The black plastic grille around the fog lamp can be removed without tools. If you look through the slats, you'll see 5 or 6 "clips" that can be GENTLY released with your finger. Once the grille is out (which is about 4 inches high by about 14 inches long), you'll see that the fog lamp assembly can be removed with 3 screws. Simpler than you probably thought!
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