P0153 98 Ford E250 v6 4.2L

before the check engine light has been coming on once in a while and turn off. Then recently it was on solid. After this code, I figured out to replace the pass. side O2 sensor before the cat. I reset the code, then a day or two later it came back. Same code. What else could it be? Should I replace/clean the MAF sensor? Should I check the wiring? Are there any specific areas on the wires that could be shorted/frayed? Thanks!

Mike

What brand of O2 sensor did you use? It's been my experience that the aftermarket sensors especially bosch don't respond fast enough and reset the code, I always try and use OE sensors. Carefully check the wiring and connectors. I have found
corroded connections twice, and one wire for the heater
that had been partially chewed through by a MOUSE!

Thanks for the response. I replaced the O2 sensor with a motorcraft (OE) from a local ford dealer. I need to check all the wires and connections then....

Mike