This is the one on the passenger side towards the rear of the truck right? My check engine light went on 2 days ago and I had Advanced Auto read it. Hopefully, this is an easier one to get out. Any tips out there?

 

bank 1 is the passenger side. my 4.6 97 F150 has 4 O2 sensors.

2 of the sensors screw into the exhaust manifolds. the easiest way to remove these sensors is to remove the inner plastic fenderwells and then unplug and unscrew the sensors(engine cold). The fenderwell takes a bout two minutes to remove.


the other two screw into the y pipe before the cat. they are accessible from under the truck

 

I know that this recommendation isn't for everyone but O2 sensors wear out. I believe it's a good idea to replace all of them about the time 50,000 clicks by. I know most will go longer than this but it's a good precaution to stop the diminishing performance that happens throughout the life of the engine. Sometimes we drive these things day in a day out and don't notice the gradual decline in perfomance.

 

If it ain't broke...

Most times, when an O2 sensor fails, either the heater portion of it has failed, be it from age or an outside power, the sampling portion has failed (usually from transmission guys unbolting the sensors without disconnecting them, twisting the wires up...ask me how I know) or it's been contaminated by something, like the evaporator drain dripping on 1-1 or an internal coolant leak, dumping coolant into the exhaust.