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TDI 101 Got a simple/basic TDI question? Are you a newbie (new to the forums). Feel free to post your question here.

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Old October 13th, 2004, 12:48   #1
JettaTDI2000
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Default How to Reset Check Engine Light

Hi,
is there a way to reset the Check Engine Light without using speacial tools? I had Auto Zone read the code for me, but they won't reset the light, so I need to do it myself.

Thanks
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Old October 13th, 2004, 13:29   #2
mainer
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Default How to Reset Check Engine Light

i belive that you just disconnect your battery
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Old October 13th, 2004, 14:02   #3
HopefulFred
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Default How to Reset Check Engine Light

some of them will go away after some number of starts - it depends on the code and condition (if the condition persists, obviuosly, CEL will too).

The "right" way would be with a VAG tool, but if you had that, you wouldn't have gone to AutoZone would you...

I would bet for a temorary code, disconnecting the battery for a reasonable length time (I think it needs to be more than just a second or two) would speed the process along. Of course, you'd have to reset your radio presets.
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Old October 13th, 2004, 14:14   #4
syncroserge
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Default How to Reset Check Engine Light

Check similarly name thread i.e. "Resetting Check Engine Light???" in this section.
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Old October 13th, 2004, 18:52   #5
JettaTDI2000
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Default How to Reset Check Engine Light

Thank you all! Looks like I am going to have to look for someone in my area with a VAG.
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Old October 14th, 2004, 05:36   #6
Toronto_Vento
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Default How to Reset Check Engine Light

Did you fix the problem? If so, put the key to on position, wait for the glowplug light to turn off, then turn key to off. (don't start the car) Repeat this 3-5 times. Sometimes this will reset the code, as the ECM has then fired up 3-5 times without detecting the problem. Otherwise you will need someone with a Vag-Com to reset the code (which is the better way to do it).
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Old January 9th, 2005, 14:11   #7
alanmcd
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Default How to Reset Check Engine Light

I have a 1999 Jetta TDI with the new body style wiht a check engine light active. I have tried to disconnect the battery and do the trick of turning the key on (5-7 times without turning the engine over) and letting the glow plug light go out. Nothing seems to work to reset the CEL. Any other ideas besides getting it reset with the electronic device? Also, I did not loose my radio presets. The only indications that I noticed was the tripometer reset to "0".
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Old January 9th, 2005, 18:38   #8
MOGolf
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Default Re: How to Reset Check Engine Light

alanmcd, you need to (1) find out why the light is on, (2) fix it, then (3) find someone with a software interface that can clear codes. None of the things you tried will ever turn off the light.
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Old January 10th, 2005, 20:05   #9
BioDzel
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Default How to Reset Check Engine Light

JettaTDI, you said Autozone read the code, but won't reset the code for you--can you just borrow the OBDII scanner, take it out to your car, and reset it yourself? That's what I did after installing my RocketChip (which Jeff warned me would cause the CEL to go on).
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Old January 11th, 2005, 11:48   #10
onehotspud
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Default How to Reset Check Engine Light

The way that I would get autozone to reset mine is:

1. Ask them to scan and give you code
2. Leave
3. "Fix it"
4. Go back and say that you "Fixed it" and ask them if they will clear it for you

Mine were all glow plug failures. And one MAF failure (I unpluged it and forgot to plug it back in before I started it). Nothing serious. As MOGolf said, if it is a real problem, get it fixed first. Sometimes those codes really are something.
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Old January 11th, 2005, 12:34   #11
GoFaster
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Default Re: How to Reset Check Engine Light

Something to re-iterate:

You can NOT turn off the MIL (aka "check engine light") without first ACTUALLY fixing the underlying problem. If you don't fix the underlying problem, it will either not be possible to reset the code, or it will reset temporarily but come back as soon as the fault gets detected again.

As for disconnecting the battery ... this persists from the early days of automotive electronics, even though there are far more vehicles with OBD-II on the road now than there ever were with older systems. On any vehicle with OBD-II, faults are stored in permanent memory. You could disconnect the battery for 1.3 million years, and it will still remember it.

Sometimes fixing the actual fault is easy, sometimes it isn't. I've forgotten to plug in the MAF, too ... that was an easy one.
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Old May 9th, 2013, 06:56   #12
laserguy
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I did the key off an on trick the light went out for how long who knows???
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Old May 9th, 2013, 09:08   #13
Joe_Meehan
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Quote:
Originally Posted by MOGolf View Post
alanmcd, you need to (1) find out why the light is on, (2) fix it, then (3) find someone with a software interface that can clear codes. None of the things you tried will ever turn off the light.
The light is no a Christmas tree it has a real purpose in life. The question is NOT the light. The real question is why did the light come on.

Fix the real problem then the light will go away and the real problem along with possible damage to your car or our safety.
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Old May 9th, 2013, 12:06   #14
jettawreck
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Default

Quote:
Originally Posted by laserguy View Post
I did the key off an on trick the light went out for how long who knows???
At least for about as long as the problem/issue stays away.....
Get it scanned properly w/VCDS and depending on the code(s) results, get the issue(s) repaired. Or, it'll be back-again and again.
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