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Oxygen Sensor

I installed the Bosch 3 wire oxygen sensor in my 88 80q. I spliced it into 
the old electrical connector with water tight crimp connectors. The 
connection is sound (triple checked).

The car has lost power and is now backfiring slightly. Could I have a bad 
sensor ?

How can I test it ?

Does it matter if the white wires are swapped ? (I tried them both ways but 
the car runs the same.)


Scott Calabrese