Code thrown
Thread Starter
Junior Member
Joined: Jun 2022
Posts: 15
Likes: 1
C63s
Code thrown
Started up my car and drove to work when not even 5 min , check engine light came on. Code is P0420 Code: Catalyst System Efficiency Below Threshold (Bank 1) DTC 2 of 3.
Upon some research culprit could be o2 sensor or the cat itself. Any input on what my next steps should be would be helpful.
Upon some research culprit could be o2 sensor or the cat itself. Any input on what my next steps should be would be helpful.
Thread Starter
Junior Member
Joined: Jun 2022
Posts: 15
Likes: 1
C63s
mine went away later that afternoon, not sure what’s going on there but getting rid of the Downpipe cats is gonna be next on my list if the code pops up again
Thread Starter
Junior Member
Joined: Jun 2022
Posts: 15
Likes: 1
C63s
