Thanks a lot for the input! The ECT sensor is the most likely culpret. My question is though, would this be something that, once it starts going bad, can
not trigger the alert to begin with, and eventually degrade to the point that it
does switch on the SES light? Also, I was told that it's possible for a faulty ect sensor can allow fuel into the exaust system and degrade the O2 sensor. If a new ECT sensor doesn't turn the light off, do you think the O2 sensor would be next on the list?
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Originally Posted by sierrap615
ask them what the code was - or goto autozone or your local parts store, some of them will pull codes for free. if you post the code i can confirm the problem. saturn had two designs of the coolant temp sensor(ECT), the first was made with a nylon case, the second with a brass case. the sensor itself is exactly the same, just the case was different, they are 100% reverse compatible. the nylon case ECT failed massively after a few years, so around 2001 they came out with the brass ECT, it should last forever. when the nylon ECT fails, it will do so slowly over time. it can throw a SES light, but 90% of the time it be noticed by drivabilty problems first (high idle, hard start, poor MPG). it is a $15 peice and a easy repair for the DIYer.
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