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Re: lambda (check engine) light 850 1997

posted by  someone claiming to be Dave the Volvo Tech on  Tue Dec 5 15:29 CST 2000 [RELATED]

Neil-

The coolant temp sender probably failed without relation to the thermostat. The car set the code because there was a faulty signal from the sender. I change a LOT of thermostats for low operating temperature and the guage is reading in the middle of the range. The ONLY way to check for a faulty thermostat is with the Volvo Scan Tool. Even with an infrared thermometer on the thermostat housing, you can't get an accurate temp reading. Lately, I have been seeing a lot of coolant temp senders failing. (setting codes)





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