Quote:
Originally Posted by wparsons
Have this checked out by someone before you start throwing parts at it... and take it somewhere that'll actually look and test things before buying sensors. A pair of O2's is not going to be cheap (going to guess about $500-$600 for the pair).
A cross threaded and/or leaking O2 shouldn't show voltage too low. Cat inefficiency or too lean/rich, sure. So make sure they verify the sensors are plugged into the right plugs, and that the harness connectors are in good shape. This could be as simple as a poor connection.
Worst case, if the sensor was damaged from cross threading, the bung on the header might be too damaged to simply chase the threads again, and it might need a new bung welded on.
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Generally the header bungs being stainless steel are way tougher than the 02 sensor threads , so its usually the o2 sensor that comes off worse for wear.