I have the following codes: P0135, P0141, P0155, and P0161. The only forum (discussion) I located expained that these codes are related to a "HO2S heater circuit malfunction." This is where the confusion begins... can anyone give me advise on what to check/replace??
I have a 1997 Contour GL - V6 - Manual Trans (90,000 miles). I changed the upstream O2 sensor against the firewall yesterday, and the codes came back shortly after running the car. I also have the other three O2 sensors that are going to be changed shortly. I did notice alot of cracked wiring in the engine harness, and am following up on the recall I found on this site regarding the engine wiring. I would appreciate any assistance with this.
