If you're getting an open circuit error, double check the sensor itself - IIRC, you should get 2.2k-2.8k ohms between the pins (diagonally) @ 68degF.

If you've got that, you've probably got a break in the wiring from the sensor to the controller or the contact points in the connector itself are corroded.

Multiple codes could also be a bad ground...

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A.S.E Tech A1,A6,A7,A8 & MVAC 609 + EPA 608

Unless stated otherwise, any question I ask is about my greymarket 1985 380SEL.