OK, from what I have read so far Bank 1 is before cats & Banks 2 is after cats, is this incorrect? I have 4 O2 sensors. 2 before cats & 2 after cats. I have the code:

P0152 Oxygen Sensor Circuit High Voltage (bank 2, sensor 1)

I have replaced both sensors before cats (bank one) on passenger & driver side. I just replaced sensor after cats on passenger side & still have the code.

I have ordered the sensor on driver side after cats.

Does any one have an answer other than that?

oh yea 2001 4.7L Dodge Dekota Quad cab

Ck the power steering switch for any fluid leakage, if you have a leak. the wire harness and o2 sensor may have p/s oil in the connectors, also ck the connectors at the PCM too. Yes a leaking p/s switch can push fluid up to the PCM.

Yes I had the power steering swith code & replaced it. It was leaking. I also checked all conectors & found a brown liquid on, in, and around a conector to my PCM. This happened about a mounth ago. I cleaned it, but some is back a mounth later. It did just as u said. GREAT INFO

What do I do now. Just keep cleaning the p/s till it is gone?

THANKS A LOT for that great info.

bank 1 is the left side of the eng bank 2 is the right side the sensor on the left side in ft of the cat is 1/1 the after the cat on the left side is 1/2 the right side is 2/1 and 2/2 if the eng is mounted side ways the ft side is the left side the side aginst the firewall is the right side