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Resetting check engine light

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Old 06-28-2009, 10:48 AM   #1
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Resetting check engine light

I am going to be replacing my O2 Sensor soon, and was wondering if I need to disconnect the positive terminal connection at my battery afterwords, to get the check engine light to go away. Will this do it?
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Old 06-28-2009, 11:13 AM   #2
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Quote:
Originally Posted by hardtaco View Post
I am going to be replacing my O2 Sesor soon, and was wondering if I need to disconnect the positive terminal connection at my battery afterwords, to get the check engine light to go away. Will this do it?
Disconnecting the battery will not reset the light in an OBD2 system, it has to be reset with a scan tool. Autozone/Advance auto parts will do it for free.
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Old 07-01-2009, 02:53 PM   #3
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Quote:
Originally Posted by ca441970 View Post
Disconnecting the battery will not reset the light in an OBD2 system, it has to be reset with a scan tool. Autozone/Advance auto parts will do it for free.
Just FWIW, a local AutoZone here in Costa Mesa, California told me yesterday that they no longer read/scan error codes, or reset check engine lights. They will only test alternators, batteries, starters. I don't know if that is just that particular store, or the whole chain...
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Old 07-01-2009, 06:47 PM   #5
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It has to be the store by you. I was at the store near me in FL last week and the guy next to me with an S-10(poor sap) was getting his checked. It may be the store by you has a bunch of lazy asses that don't want to do it.
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Old 07-02-2009, 07:06 PM   #6
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Try disconnecting the negative battery terminal for 30 seconds, that should clear the computers memory, and reset the light. But, it also will clear all your readiness monitors, so if you're going through emissions any time soon, you'll need to wait until you make two drive cycles for the monitors to reset.
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Old 07-02-2009, 08:28 PM   #7
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Autozone won't reset, they'll only read. I've never asked if they would reset for me, however.

CA had some new law or something that said that Autozone can't scan anymore. Go figure it happened in CA.


Disconnecting the negative terminal will reset the light (i disconnected for like 5 min or so) but it will also reset your trip odometers and radio presets.
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Old 07-03-2009, 06:20 AM   #8
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I just changed my O2 sensor and VatoZone reset it for me. The douche behind the counter said "we arent supposed to do that" as he picked up the scan tool and headed out to the parking lot. No more CEL!
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