re: OB mechanics, 4x4 help needed

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computer re-flashed

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I think that's what they did.

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So are you saying the computer is expecting input from a fourth sensor, but there is no place to wire it in

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The computer thinks it is a 350 computer and monitoring a 350 exhaust system with two convertors but my exhaust is the original 305 exhaust with only one convertor. I'm not sure if there is or isn't a place to add wires for the missing sensor in the current harness connection.