OK so I let the Power steering pressure switch leak for a while and now I can't get rid of a downstream O2 sensor error amd the mileage is down.
I have replaced the O2 sensor and the P.S> pressure switch - no more leak - and cleared the codes a few times.
I've cleaned the connections on the harness at the O2 sensor and the PS. pressure switch connector.
I hav evisually inspected as best I can at both ends the harness.
What are the next steps to try and determine what the possible problem is?
Thanks in advance
2001 4x4 4.7.

 

the problem is that you have fluid in the harness, and it is nearly impossible to get out, you need to follow the entire harness and open up the wire loom and clean up all the ps fluid that leaked through it, this is the only way to solve your problem without running new wires

 

Sharp - thans for the info. As soon as it warms up in Chicago I'll give it a go.