Bad coil packs failing under hi heat temps or failing check valve in the fuel pump allowing pressure to drop in fuel system and resulting in fuel boiling in the lines resulting in a no hot start condition.
where is the check valve
If your doing a lot of city driving you should get it fixed... the thermostat tells the cars computer when to turn on the fan which provides more the 50% of your engine's cooling in city driving!
A flat tire is one possibility
I have a similar problem with my 1995 blazer. I find that wiggling the relays in the glove compartment starts mine up again. So far I have yet to figure out how to permantently fix this.
Change the fuel filter first.
An old spark plug will cause too much power on VW Jetta GLS 1997 and make plug wire to arc out.
Check for clogged converter (1 possible cause)
Your engine starts to overheat and if not addressed promptly will cause permanent damage to engine due to thermal breakdown
My 92 PA did the same thing. I had to replace the crank sensor and then the cam sensor. Either one can cause this problem.
Check fuel cap: Illuminates when the fuel cap may not be properly installed. Continued driving with this light on may cause the Service engine soon warning light to come on.
Consult a Local Transmission Shop
Dirty unchanged oil and oil filters can sometimes cause smoking
To turn off the check engine light on a 2001 Volkswagen Jetta 1.8T, you can start by addressing the underlying issue that triggered the light, which may involve checking for any diagnostic trouble codes (DTCs) using an OBD-II scanner. Once the issue is resolved, you can reset the light by disconnecting the car battery for about 15 minutes or using the OBD-II scanner to clear the codes. Alternatively, driving the vehicle for a few cycles may also cause the light to turn off if the issue is resolved.