Roni0219 New Member Joined Jun 4, 2022 Messages 2 Location Leesburg Florida Jun 4, 2022 #1 My catalytic converters were clogged in my 2012 JK. I put new ones in it and after a few drives, it threw the cat code again 0420. What would be causing this? Reactions: mrjp
My catalytic converters were clogged in my 2012 JK. I put new ones in it and after a few drives, it threw the cat code again 0420. What would be causing this?
BLACKJKU Moderator Staff Member Lifetime Supporting Member Joined Feb 22, 2020 Messages 5,134 Location Huntington In Jun 4, 2022 #2 Did you put factory cats on or a aftermarket high flow cat? Reactions: mrjp
Roni0219 New Member Joined Jun 4, 2022 Messages 2 Location Leesburg Florida Jun 5, 2022 #3 OEM replacement
BLACKJKU Moderator Staff Member Lifetime Supporting Member Joined Feb 22, 2020 Messages 5,134 Location Huntington In Jun 6, 2022 #4 Did you replace your downstream O2's with OEM sensors? Reactions: mrjp
