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Old 03-28-2012, 03:20 PM   #1
gelboy1015

 
Drives: '10 2SS/RS, MKIII Supras
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P0420 Code Popping Up...

Recently, I've been having issues with my car throwing a CEL. I got it tuned in late Dec/early Jan and everything was fine. 2 weeks ago, I noticed the CEL was on. Car felt fine, ran normally, nothing unusual. Had the codes run and it came out to be the P0420 code for cat deficiency or w/e, which was tuned out. Cleared the code and it didnt come back... until yesterday. Noticed the CEL on while driving around town. Had a friend pull the codes and it was the same P0420 code... I haven't had any problems in the last 2-3 months until 2 weeks ago.

Now my question is: What could be causing the code to keep coming on, even though I've already been tuned? All O2 sensor wires are connected, nothing looked unusual when I dropped my exhaust a couple days ago. Im currently out of town from where my tuner is, and I wont be back until next month for him to double check the tune, so I was wondering if anyone knew why Im getting the CEL all of a sudden. Thanks in advance!

Edit: Would running 91 octane, then running 93, then putting 91 back in cause this? Reason why I ask, is because the night before the CEL came on, I was driving down from Oklahoma with a full tank of 91, filled up with 93 in Texas, then drove it the next morning when the CEL came on. Yesterday, I had just filled up with 91 the day before since I came back to OK... previously had 93 in the tank. Dont know if this affects anything, but figured I'd throw it in there, lol.
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Old 03-28-2012, 03:21 PM   #2
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Old 03-28-2012, 04:55 PM   #3
Slowhawk
 
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The code would not come up if it was tuned out. Either it was missed or the code reader is spitting out the wrong code.
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Old 03-28-2012, 11:03 PM   #4
gelboy1015

 
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Quote:
Originally Posted by Slowhawk View Post
The code would not come up if it was tuned out. Either it was missed or the code reader is spitting out the wrong code.
I havent had any problems for the last 2-3 months until now. 2 different code readers pulled the same code... I guess Im going to have to have the tune looked at again when I get back in town.
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Old 03-28-2012, 11:29 PM   #5
Fast Motorsports
 
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Quote:
Originally Posted by Slowhawk View Post
The code would not come up if it was tuned out. Either it was missed or the code reader is spitting out the wrong code.
These are the only two options. Should be a quick fix for your tuner
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Old 03-29-2012, 09:12 AM   #6
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http://www.camaro5.com/forums/showthread.php?t=203421

I am having the same issues. I have been tying to keep it updated to help others out with my findings. Im going to update it this weekend after i get it in the air to look some things over.
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