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Old 03-30-2009, 09:13 AM
xls177 xls177 is offline
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How do i reset my 98 check engine light ?

I need to reset my check engine light to cleaer codes on my 98 F150 4.2 liter.

How can i do it.
I was told i could just pull negative cable.

Thanks
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Old 03-30-2009, 09:24 AM
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You can either go to autozone and have them do it for free or just diconnect the negative cable for a few minutes and then reconnect it.
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Old 03-30-2009, 10:01 AM
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First off, fix the problem that set the code. Some codes will clear themselves when you fix the problem. Second off, document all the freeze frame data of when the code was set. Some codes are not as simple as they first seem, and this data can become valuable in the event future problems occur, or if the problem comes back. The best way to clear the code is with a code reader. Many auto parts stores can do it for you. Myself, I would get my own OBD-II reader and do it myself. Having the reader will come in handy. You can do it by disconnecting the battery, but that clears the memory of other things too.
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Old 03-30-2009, 01:06 PM
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I agree, get the code(s) read and resolve the problem before clearing the error codes. If you disconnect the battery, leave it disconnected for 10-15 min. and turn on the headlights to drain any power left in the ECU.
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Old 03-30-2009, 07:11 PM
projectSHO89 projectSHO89 is offline
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Bah! on a 98, the easiest way is to remove the 3 or 5 A mini-fuse in tthe engine compartment 2nd fusebox. Leave it out for 10-15 minutes with the ignition off before reinstalling.

If the light comes back, go get it read.

If you disconnect the
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Old 03-30-2009, 10:15 PM
xls177 xls177 is offline
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Thanks guys for all the help

Got it reset
Pulled the negative cable for about 2 minutes
put it back on and all is well

If it comes back on i will get it read
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Old 03-31-2009, 08:10 PM
Spotty Spotty is offline
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If you use a code reader to clear codes, the light will go off and the history is gone. If you do the fuse thing or battery cable, the light goes out, bit the code stays in history. If the light goes off because the problem resolves itelf after so many drive cycles, it will stay in history also. I have tried it and that is how it worked. The CEL will come back on regardless of how you got it to go out if the problem still exists.
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Old 04-01-2009, 07:01 AM
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Quote:
Originally Posted by Spotty View Post
... If you do the fuse thing or battery cable, the light goes out, bit the code stays in history....
Your "knowledge" is wrong.

Removing the power resets KAM (Keep Alive Memory) which clears ALL accumulated data and stored parameters. Everything is is reset back to factory defaults and all the stored codes locations are zeroed out.
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Old 04-01-2009, 07:41 AM
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Quote:
Originally Posted by projectSHO89 View Post
Your "knowledge" is wrong.

Removing the power resets KAM (Keep Alive Memory) which clears ALL accumulated data and stored parameters. Everything is is reset back to factory defaults and all the stored codes locations are zeroed out.

When our sons 2000 Sunfire had a plugged cat, the CEL was on. The battery was off for a week as I waited for parts. When I hooked it back up the CEL was off . I plugged in my scanner and pulled out at least 5 old codes, one of which was a cat code. Perhaps I should not have posted what I did on a Ford site since Pontiac may be different. Thanks for your input though on my mistake.
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Old 04-01-2009, 07:41 AM
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