I have a 2000 Jetta TDI diesel. My check engine light went on about 4 months ago (the lightning bolt into the engine one). Called the dealer and told me to come in and they would check it on the computer. Said it was no problem and not to worry until the next service. They replaced the glow coil and it went out(the warning light)but came on about 2 weeks later. They have replaced the glow plug 4 times now and I continue to drive around with the warning light on and they say not to worry. Anyone else having this problem with their diesel??? I hate to continue with the light on, if something really is wrong and I disregard it as the dealer has suggested.