Re: Changed thermostat - now check engine light is on ... - Saab 9-5 Bulletin Board - Saabnet.com
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Re: Changed thermostat - now check engine light is on ...
Posted by jeff in MD (more from jeff in MD) on Wed, 9 Feb 2011 04:37:23
In Reply to: Changed thermostat - now check engine light is on ..., Caspar, Wed, 9 Feb 2011 02:13:16
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Many things can cause a CEL. The thermostat itself isn't monitored directly by the ECM. The temperatures are, so a bad thermostat will manifest in a CEL, such as by a too-cold coolant temp code if the thermostat never closes. Does the temperature range seem correct?
There is a coolant temperature sensor right near the thermostat. It's possible the connection got loosened or something while they were replacing the thermostat? Just a guess, not likely but possible.
Recommend taking the car by an Advance Auto Parts (or your nearest equivalent) where they'll scan codes for free. The code doesn't exactly tell you what wrong but it's a big clue and will help us internet-diagnosticians help you.
jeff
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