Wow this hhr loves me, p0420 cat eff low?
Yes the P0301, is cured. That cleaner could have tripped the P0420, mine was from oil getting sucked out of the valve cover. Moving the second O2 sensor out just one spacer has resolved my issue and it might for you. You could run a can or two of Seafoam or Cat-Clean it might also cure the issue.
never did that before on a car but seems like a healthy concept!
Charles
Thread
Thread Starter
Forum
Replies
Last Post
Happy13178
Problems/Service/Repairs
3
Dec 29, 2014 09:08 AM
NxlKing2304
Problems/Service/Repairs
15
Feb 14, 2014 07:41 AM
NxlKing2304
Problems/Service/Repairs
8
Jan 24, 2014 11:34 AM



