okay... sorry it has taken me so long to report back. I wasn't in a huge hurry, but I have to take the little bug through emissions before the end of the month, so I had to go ahead and deal with it. so, I replaced the coolant temp sensor with a new OEM part. I hate doing those things. seems like a always make a mess. anyway, next was the glow plug code. I bought 4 new OEM glow plugs several days ago, and went out one day to change them. as I unplugged each one, from left to right (as standing in front of the car looking at the engine) the last one I came to was broken. the part on the wiring harness that pushes onto the glow plug had completely broken off. today, I received my new OEM harness in the mail, and changed it out. (also put all my new plugs in) so, I was pretty aggravated when the check engine light came on again. I had the negative lead off the battery the whole time I was doing the work, so I figured that would reset the code. I tried starting the car a few times, and drove it around the neighborhood some, but the light still came on after a minute or so. next, I took the car down to o'reilly's and let them pull the code. also told the kid what I had done. the code that came up was the same glow plug code. he said since I had changed the parts, that he would reset it for me. (which he did) the light didn't come on as I was on my way home. so, I'm hoping that it had to be reset, or it simply had not been though enough cycles to make the light go out. either way, I'm hoping that it won't come back on. hoping that I can take it through emissions tomorrow before it comes on for some other reason. at any rate, thanks for the advice.