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resetting codes

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Old 31 Mar 2013, 03:23 am
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Join Date: Sep 2012
Posts: 6
Question resetting codes

Ok this might be a stupid question. But I don't know the exact answer.
I have done the 'key dance' and repaired what ever might have been wrong. And maybe the check engine light isn't coming on any more. Maybe it is. But what I want to know is how exactly to RESET to where no codes are showing up from past times. I know that it has a memory of old codes. I just don't know how to reset it. So that if I have a new problem come up, then it might not show the OLD codes too.
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Old 31 Mar 2013, 03:42 am
Ray_Dockrey's Avatar
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Join Date: May 2012
Location: Mustang, OK
Posts: 1,213
Default Re: resetting codes

Unhook the battery for about ten minutes. That will do it. Now after you that a code will be set in memory that shows the battery being disconnected but it won't set the light.
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Old 31 Mar 2013, 09:18 am
2step's Avatar
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Join Date: Oct 2004
Location: New Braunfels, Texas.
Posts: 1,672
Default Re: resetting codes

Ray_Dockery is correct. The code memory system is designed to retain the trouble code for a while. This is so an owner can get him/herself to a mechanic and the code can be called up even if the issue has been a temporary one. Codes will also self clear after a certain amount of restarts if the problem is fixed. Codes can also be cleared with a good quality code reader/scanner.

Say you make a complete repair because you have to pass an emissions inspection right away. If you simply clear with the battery disconnect, you may still fail to pass if the "disconnect" code is still stored. This is to prevent owners from clearing unrepaired emissions problems right before an inspection.
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Old 31 Mar 2013, 07:46 pm
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Join Date: Sep 2012
Posts: 6
Talking Re: resetting codes

well I put on my second O2 Sensor yesterday. The first one I bought was a Bosch and I have read on here that they won't work right for the PT Cruiser for some reason or another. And it didn't. So I put on a NTK one last night. And drove it for like five minutes. And the light was still on. But today the light hasn't came on and I have probably started like 10-15 times and went like 50 miles. So I guess I won't have to disconnect the battery. I will do the 'key dance' tomorrow to see if the codes are still stored for the O2 Sensor or not.
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