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Oxygen senser malfunctioning S70 1999

The sensor is actually $170.00, my cost from Volvo. The connector isn't the same on the Bosch one, requiring a simple modification, that each time has set a check engine light. I've replaced quite a few 02 sensors on 99's, but usually they are running really rich when I do so. I have noticed though, the connectors are rather icky. If your car is not running poorly, or kicking out black smoke on occasion (look at your bumper for tell-tale evidence), I'd probably try cleaning the connector before investing the money.

Chris






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