Well I'm getting myb first experience with Volvo Check Engine Lights. My daughter just baught a used 940 waggon with 90K miles and gor about 200 miles down the road and the light came on. My code list says Heated Oxygen Sensor. Is the usual fix for this to replace the sensor? Any wisdom from the experienced would be helpful. Thanks Cap'Dan

Hello Capt Dan: Congrats on the wagon! At 90k it should have at least 200k left in it without breaking a sweat. Check out the 700/900 FAQ in the pull down Features bar at the top of the page for great info on these models. You should just probably disconnect the neg battery cable for 15 minutes to re-set the ECU to see if the code re-sets ,or if it was just a passing problem. Just make sure you have the code for the radio ,if it is still factory, before disconnecting the battery.
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'94 940 na Regina 150k, '86 240 180k, 93 Camry 5sp 245k, 88 Toy 4wd 166k

Thanks Summerduckman, your list of cars sound like our other fleet most well over 150K. Thanks for the reply. It did reset with power disconnected, no we will see if it is a prevailing fail or just because the car was not used for an extende period of time. Thanks again.