I have a 1997 Saturn SL2 that I purchased just 3 weeks ago. It seems to run fine but the service light stays on. As of yesterday the Service Engine soon light also came on. I took it to Auto Zone and they scanned it and the code was P0711. They said something to do with a trans temp sensor. I then took it to the garage where they done a more thorough scan and it had six codes stored. They are P0341, P1640, P0711, P1641, P1620, and P0605. I do know that the sensor that plugs into the bottom of my coolant tank is bad so that's probably where the P1620 is coming from. All the others I know nothing about and need some input. If anyone can tell me where to start, what to do, etc I would appreciate it. A little back ground info on the car. It was a one owner and I have all the original maintenace records and it's been maintained very well. It has 152000 miles on it. Seems to run just fine, shift fine, a little bit of a vibration at low speeds. Also occasionally the oil light will flicker and then disappear. Any info would be helpful as I'm working on a very limited budget and need to start from the bottom. Thanks.