99 jetta check engine light on, runs fine, speedometer not workin

99 or 95??? Most car parts stores will read your codes for free. Once you have the code definitions, then you can locate your problems. Most likely speed sensor and ABS sensor on one of the wheels.

there is a code set in the pcm(computer). it could be a problem with the vehicle speed sensor(VSS) that would cause the speedometer to stop working turning on the check engine light to get things checked out.

did you try to reset.

Can be loose speedo wiring connectors under instrument panel or its issue with speed sensor on transmission.

I suggest you to go through help links mentioned below with appropriate solutions to confirm the problem :------

How to trouble shoot speedometer?

http://schematicsdiagram.blogspot.com/2011/06/speedometer-not-working.html

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1996 fiat bravo speedometer not working?

http://technoanswers.blogspot.com/2012/01/1996-fiat-bravo-speedometer-not-working.html
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Speedometer works but odometer not working?

http://technoanswers.blogspot.in/2012/01/speedometer-works-but-odometer-not.html

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Speedometer runs backward?

http://technoanswers.blogspot.com/2012/01/speedometer-runs-backward.html

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Warning lights on and speedometer died?

http://howtobyme.blogspot.com/2011/08/warning-lights-on-and-speedometer-died.ht

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Speedometer not working on 1993 Ford F350?

http://repairhelpcenter.blogspot.in/2012/02/speedometer-not-working-on-1993-ford.html

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ABS & Brake lights warning indicator steady on dash and speedometer not working for Dodge Ram?

http://howtobyme.blogspot.com/2011/11/abs-brake-lights-warning-indicator.html

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Vehicles Cluster panel Not reading Miles?

http://schematicsdiagram.blogspot.com/2011/12/vehicles-cluster-panel-not-reading.html

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Odometer works properly but speedometer works intermittently?

http://technoanswers.blogspot.com/2012/01/odometer-works-properly-but-speedometer.html

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These will help.
Thanks.

When Check Engine Light ( CEL ) turn on, you need to have the codes read. Some places will read them for FREE. There are some other threads in this Forum that recommend to go to Autozone (or another parts store) where they will provide you a code reading free of charge. Get the exact code (like P0XXX) not just their and post it back here.

In THIS LINK could find additional interesting information about TDI FAQ.

Regarding warning lights:
- if the coolant temp light comes on, shut off the engine ASAP
- if the oil warning light comes on, shut off the engine ASAP
- if a falshign MIL/CEL comes on, shut off the engine ASAP

ASAP means driving to the berm of the highway right now and not waiting for the next exit. But if the MIL/CEL is not flashing, then it's not an urgent indicator.

Its possible that one simple unplug or any bad signal sensor. Are you recently make any mechanical job there?

Keep us updated.

You should get the OBD codes read. This should pinpoint the problem. This light is connected to an emmissions problem. Re setting it will do nothing as it will come back on as soon as the on-board computer re=booths. As you dont have a loss of power,it sounds very like one of the lamda units is faulty, but do the code reading to be sure.
Best of luck with it
John

the only way you will find this out is to have a diagnostic machine plugged in and the fault memory read to check what fault is logged, it could be anything from a ABS wheel speed sensor to a control module fault, to save money in the long run i would advise you get the fault memory read first. hope this helps

the engine check light is telling you that there is a fault with a sensor on your engine

you need to go to a garage to have the fault codes read from your computer

even though your car is running fine its a matter of time before it plays up

I had the same exact problem at 175000 miles on my '99 Silverado..after paying the garage several times to read the computer codes to me and ex-plain that 1st I needed an $899.00 head gasket repair, and then just a $250 injector replacement, I decided to run some injector cleaner throguh the system...guess what?............I cetainly am glad I didn't have the head gaskt repaired or the injector replaced...problem fixed

alot of cars show a crankposition sensor on a test if it was bad car would not run unless you have a problem with car stalling or running bad when it gets hot not a ignition module if car still runs good not a major problem one problem would be a bad 02 sensor does not mess with car alot gas milage loss mabe slight hesitaion look at sensors that dont mess with engine if not 02