booyaolian Posted May 28, 2008 Report Share Posted May 28, 2008 Guys, what does this code P0420 mean? I got a check engine light on and a message saying Emission Service blah blah...Thanks in advance. Link to comment Share on other sites More sharing options...
booyaolian Posted May 28, 2008 Author Report Share Posted May 28, 2008 btw, how do you reset the car so the message and check engine light will be turned off?do you just disconnect the negative terminal on the battery or what? Link to comment Share on other sites More sharing options...
FatLadZ Posted May 28, 2008 Report Share Posted May 28, 2008 P0420 Catalyst System Efficiency Below Threshold (Bank 1) could be your cat is on it way out matey :( Link to comment Share on other sites More sharing options...
MrWinkey Posted May 29, 2008 Report Share Posted May 29, 2008 P0420 Catalyst System Efficiency Below Threshold (Bank 1) could be your cat is on it way out matey ;) Link to comment Share on other sites More sharing options...
96pos Posted June 11, 2008 Report Share Posted June 11, 2008 read www.aa1car.com/library/p0420_dtc.htmI thought it was informative. If you just want to shut off the light go to autozone or advance and ask someone to scan and clear your check engine light. They do it for free.I get that code intermittently. Sometimes it goes away on its own and eventually returns. I don't know what that means but haven't really worried about it yet. Maybe when I'm due again for an emissions test I'll start to panic. Link to comment Share on other sites More sharing options...
dmelviØØ7 Posted June 11, 2008 Report Share Posted June 11, 2008 If it comes back after it's cleared, you'll need a cat. Link to comment Share on other sites More sharing options...
dang Posted June 11, 2008 Report Share Posted June 11, 2008 If it comes back after it's cleared, you'll need a cat.I had the P0422 code, same thing as yours. I had the vehicle checked for vacuum leaks, checked O2's to make sure they were operating properly, checked fuel pressure, and checked compression (had one cylinder low ~130). I did the seafoam thing, cleared the code and it came back a couple days later. I took it on a good highway drive for about an hour at 70 + mph and the light eventually went out on it's own and hasn't returned. That's been three weeks, ago. So, I haven't had to purchase a cat, yet. Link to comment Share on other sites More sharing options...
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