how do i reset the check engine light after the fix

5

Asked by Nov 01, 2015 at 12:48 PM about the 2004 Ford F-150 Lariat SuperCrew

Question type: Maintenance & Repair

12 Answers

595

Bi-directional scanner

4 people found this helpful.
115,805

A scan tool is the easiest way, but you can also reset it by removing all of the ECM and KAM fuses for a few minutes before putting them back in, you will loose any presents you may have made like radio stations etc. The 3rd way is to disconnect a battery cable, and wait a few minutes before putting it back on, but people have had problems with newer vehicles turning on the antithieft systems, so if you opt for this plan make sure you know how to deactivate it before hand. HTH

3 people found this helpful.
79,085

If the repairs solved the problem the light will go out on it's own. To speed up this process keep your gas tank between 3/4 and 1/4 full. No more and no less. That way the computer can run all the diagnostics. If it's still on after a week of normal driving there's something else going on. HTH. -Jim

4 people found this helpful.
23,310

If you purchased the part at a national auto parts chain, they have bi-directional scanners. Just ask them to clear all the codes.

1 people found this helpful.
595

Disconnecting all the electricity to an ECM will never "erase" codes in an OBD-2 system. A lightning bolt might do it, if it's a direct hit, but modern ECMs are designed to not allow any owner or parts house to do it without a bi-directional scanner. The last ECMs that dumped data by disconnecting the battery were the old systems that were pretty much fazed out around 1994-5.

6 people found this helpful.
115,805

I have to disagree with you there JPV, even my 05 Yukon will reset back to factory settings if all the power is removed and allowed to sit for a few minutes, I have even rechecked with my scanner just to make sure the codes are gone, but a scanner is still the best way to do it.

1 people found this helpful.
595

I see. Kinda odd though.... not disbelieving you, but I've been an MVPC/INSTALLER-INSPECTOR in California for many years ... over 47 ... and this as been debated a lot. However, having never seen that happen myself, and not had any close associates say they saw it either. .........., makes me wonder why this might not be able to replicate on any vehicles I worked on in days past. I just finished a '98 Suburban today that the customer repeatedly tried to erase his codes like that. It didn't work for him either, but i'm keeping a slightly open mind on this yet

1 people found this helpful.
115,805

JPV the biggest mistake they make is not removing the KAM power so the code stays put.

2 people found this helpful.
100

I have a 2002 f150 my eng. lighte keeps come on what wood it be

10 people found this helpful.
35

my f150 4.6 check engine light stays on. sometimes it flashes while driving on the highway. I know it's a misfire. I am considering changing the spark plugs. has anyone else had this issue? Did changing the spark plugs work?

3 people found this helpful.
20

If its flashing, it means its a major misfire. Could be the plugs, but doubtful. Is more than likely a shot ignition coil or a bad injector. Seeing as how we dont have distributors.

2 people found this helpful.

My 09 f150 was doing the same thing until a few min ago. It needed new pugs. Ichanged the plugs and woohoo!!! No ore skip while accelerating. No more flashing eng light. now, i just need to get the eng light turne off.

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