Check Engine Light on'99 Jetta

Check Engine Light on'99 Jetta

Posted in the Volkswagen Jetta Forum

Mike

Fall River, MA

#1 Nov 6, 2006
I have a recurring "Check Engine" light on my daughter's '99 Jetta. Scanner indicates emission leak-small. Mechanic states it is a gas cap problem. I have replaced the cap, ensured it was tight and had the mechanic clear the code. The light was back within a few hours. What are the possible causes of this problem beyond the gas cap? Thanks.
Patty

Baltimore, MD

#2 Jul 18, 2007
I just found this website. I have a 99 Jetta, check engine light on, diagnostic testing said speed sensor, replaced, check engine light still on, now they say it's the drive gear in my trans.($1300.00)(go figure)

My speed/tachometer doesn't work. In MD with the check engine light on you can't pass the test.
Wayne

Denver, PA

#3 Sep 18, 2007
I removed and cleaned the battery terminals on my 99 Jetta and now the engine runs very rough....any thoughts or ideas???
Running

Machesney Park, IL

#4 Sep 19, 2008
Wayne wrote:
I removed and cleaned the battery terminals on my 99 Jetta and now the engine runs very rough....any thoughts or ideas???
i can tell you. the ECM controls your fuel and air mixture. and when you took off the battery cable to clean the battery terminal. the ECM Air/fuel mixture was wipe and now has to be reprogramed in. i had the same problem. if you have the computer to hook it up to you can reprogram it then. or else take it to a guy or a shop that has one for volkswagen. hope that helps
idk

Canton, MI

#5 Apr 7, 2009
yea i was wondering where do i hook up the scanner on a 99 vw jetta
vdubber

West Covina, CA

#6 Feb 5, 2010
its under the radio right by the cigarette lighter
perrys783

Manteca, CA

#7 Apr 15, 2010
Ihave a 99 jetta the code is PO134 for the check engine light can you tell me what this is
colby

Marshfield, VT

#8 Aug 2, 2010
it has nothing to do with any speed scanner or anything my mechanic said that all the o2 sensors were good but it was the cataylist converter which was bad and in your owner manual it will tell you what that light means and it points you in the right direction.
kayla

United States

#9 Aug 8, 2010
I had the same problem with my 99 jetta, you have to order the fuel cap from the dealer you can't just purchase one from a parts store jettas have a specific fuel cap that seals tight but of course a generic one will not help it, so if you bought one that could be the reason, cause I had to go bjy one about 32$.
Mike wrote:
I have a recurring "Check Engine" light on my daughter's '99 Jetta. Scanner indicates emission leak-small. Mechanic states it is a gas cap problem. I have replaced the cap, ensured it was tight and had the mechanic clear the code. The light was back within a few hours. What are the possible causes of this problem beyond the gas cap? Thanks.
atx

Austin, TX

#10 Aug 11, 2010
Running wrote:
<quoted text>
i can tell you. the ECM controls your fuel and air mixture. and when you took off the battery cable to clean the battery terminal. the ECM Air/fuel mixture was wipe and now has to be reprogramed in. i had the same problem. if you have the computer to hook it up to you can reprogram it then. or else take it to a guy or a shop that has one for volkswagen. hope that helps
I hope no one took this serious. If it happens to anyone else, just look around for a vacuum line that was knocked off.
Billy

United States

#11 Jul 24, 2012
On a friends '99 Jetta when she got on an onramp and accelerated, she felt the car not wanting to "go," and watched the engine light blink then on steady, I ran the code to get PO303, 3rd cylinder misfire. Cleared the code and not seen since and now runs fine. Possible causes? Or solutions?
JazzyJ87

Union City, GA

#12 May 12, 2015
How do I change the time on my 99 VW Jetta
JazzyJ87

Union City, GA

#13 May 12, 2015
On my 99 VW Jetta, my dashboard and ineterior lights flicker on/off along with my radio. Any possible causes?
derick

Mcdonough, GA

#14 May 30, 2015
Where do you hook up the scanner to read the codes ???
Love2hatemycar

Tacoma, WA

#15 Mar 17, 2018
034 comes back cam shaft position sensor doesn't have one so I changed the distributor and the ECU. Check engine light clears but comes back on. Wont pass emission

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