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Map sensor problems are more common on certain models. As far as engine computer sensor reliability this is one of the sensors that appear to be more reliable overall. But on a few models poor mounting location chosen by the factory may reduce its reliability.
I'd be taking the dash apart looking for burnt wires in a harness, so you will likely have to take the outer cover off some of the bundles. Start tracing back from the plug in for the radio. Hope this helps.
VOLVO STARTED USING THIS SYSTEM IN 1996 AND 1997 850 MODELS IT IS AN AIR PUMP --------------SMOG PUMP TO MEET EPA EMISSIONS THE DIAGRAM OF THE SYSTEM IS LOCATED UNDER THE HOOD AND SHOULD TELL YOU WHERE THE VALVE IS LOCATED THERE ARE MANY ECU SYSTEMS USED ON VOLVOS AND THIS SHOULD PUT YOU IN THE RIGHT DIRECTION IF YOU STILL HAVE A PROBLEM GIVE ME THE 2 BIG NUMBERS ON THE ENGINE MANAGEMENT ECU
If you need the security code, you need to call a Volvo dealer and give them the VIN number, provided it is the same stereo the car came with. Most dealers will do it for free, if you can't find one, call Boston Volvo Village.