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Old 01-12-2003, 05:04 PM   #1
dvancleve
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Question Reset check engine light w/out going to dealer?

My check engine light came on a couple days ago for no apparent reason. I checked the oil and coolant and everything seems fine. The car is running normally as far as I can tell, and I suspect there isn't really anything wrong. I know that things like not getting the gascap on tight can trigger the warning light... I would like to reset it myself and see if it stays off. Would disconnecting the battery overnight do it? If now, can it be done without visiting the dealer?

Thanks, Doug
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Old 01-12-2003, 06:23 PM   #2
AGscooby
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Lightbulb

IIRC, resetting the ECU as you suggest will clear the CEL. I believe the battery need only be disconnected for a little over an hour. There's a nice little write-up on ScoobyMods.com.

AG
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Old 01-12-2003, 06:24 PM   #3
Peaty
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Removing the battery may or maynot work. If one of the gazillion sensors are bad it will just come back on again. You can take it to an autozone and have the code pulled and see what's wrong though.
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Old 01-13-2003, 02:09 PM   #4
ciper
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But you dont NEED to reset the light!!!

If the problem is fixed the light will go out. If the problem still exists the light stays on. Its very simple.
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Old 01-13-2003, 02:29 PM   #5
richeich
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I always thought that once it threw a code, the CEL would stay on until it was reset. Mine threw a CEL a few weeks ago. It was only on for about a day before I had some other work to do on the car. I disconnected the battery and reset the ECU while I was working on it. Everything has been fine since, no CEL. I figure if it comes back, then maybe I'll have the code pulled. Otherwise, I'm not worried about it.

Rich
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Old 01-13-2003, 02:57 PM   #6
sovereignmk1
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Your local schucks/kragen or similar should be able to pull and clear the code for free

//Mark
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Old 01-13-2003, 04:32 PM   #7
ciper
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Im going to post something in service forum. I think you guys are wrong.

edit: Lets see what everyone else thinks. http://forums.nasioc.com/forums/show...hreadid=300696

Last edited by ciper; 01-13-2003 at 04:39 PM.
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Old 01-13-2003, 07:44 PM   #8
AGscooby
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Wink

Okie doke, I stand corrected. The circumstances under which the CEL occurs depends on the type of problem. If Doug's car is functioning, he can try to clear it by disconnecting the battery. If the CEL continues to occur or reappears again, then there is a 'hard fault' cauing the code. If the CEL does not appear again, the cause was possibly intermittent.

AG
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Old 01-14-2003, 07:45 PM   #9
dvancleve
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Exclamation Disconnecting the battery cleared the CEL...

To recap,

I had the CEL come on but couldn't detect anything wrong (oil and coolant levels fine, car running normally). I know something as trivial as leaving the gas cap a bit loose can trigger the CEL (and I figure if something is really wrong it will come right back on), so I disconnected the battery overnight to see if it would go away. It did, and hasn't come back so far.

I realize that this should have/did clear out the ECU memory, but I can't feel a difference seat of the pants and my mileage is not that great anyway. I guess if the light comes back on soon I will take it in to the dealer or see if there is an independent Subie shop in the Chandler/Mesa/Tempe area...

Doug
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Old 01-15-2003, 09:25 AM   #10
AGscooby
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Lightbulb Re: Disconnecting the battery cleared the CEL...

Quote:
Originally posted by dvancleve
I realize that this should have/did clear out the ECU memory, but I can't feel a difference seat of the pants and my mileage is not that great anyway. I guess if the light comes back on soon I will take it in to the dealer or see if there is an independent Subie shop in the Chandler/Mesa/Tempe area...

Doug
I've read that it'll take a 100 miles or more before your ECU has relearned your driving habits. Since you weren't getting great gas mileage previously, you might want to go easy on the gas to put the ECU on the "economic learning track".

AG
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Old 01-15-2003, 03:33 PM   #11
rallysquirrel
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watch out for that CEL. If its misfire in a cylinder, you wouldn't feel it, but after a while the headgaskets will go.
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Old 05-21-2013, 04:36 PM   #12
Kevan711
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If you disconnect the battery do you lose your bluetooth settings, radio stations, etc?
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Old 05-21-2013, 06:57 PM   #13
Patrick Olsen
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Only one way to find out...
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Old 05-22-2013, 11:29 AM   #14
subie98
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Quote:
Originally Posted by Patrick Olsen View Post
Only one way to find out...
lol true
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Old 05-22-2013, 10:58 PM   #15
Frogsthatmoo
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Quote:
Originally Posted by Kevan711 View Post
If you disconnect the battery do you lose your bluetooth settings, radio stations, etc?
typically, yes
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Old 05-23-2013, 03:43 AM   #16
Kevan711
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Quote:
Originally Posted by Patrick Olsen View Post
Only one way to find out...
And that would be to ask someone for an intelligent response?
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