I have a 98 225 EFI , I have been cleaning the 02 sensor and the small rod that goes in to the exhuast chamber on a regular basis. I just took it off the other day to check and see if there was any carbon build up and it was fine. reinstalled the sensor and know at low rpm she shakes and runs rough around 800-1400rpm. never did that before? I noticed that the wires on the top of the 02 sensor the wires look to be pinched and not in good shape from removing it so many times. Is there and way to check ohms or continuity to see if the wires are broken? before I go and buya $300 part?
