I have a 2000, F150, 5.4 , 4x4, auto. AT 116,000, the check engine light came on, code said o2 sensors. Had all 4 sensors replaced. Short time later, light came back on reader said o2 sensor passenger side . Had all of the wires run, substituted sensor from drivers side, to no avail. Reset check engine light . Engine went 500 miles and light came back on, code was for the sensor heater on passenger side. What do I do now, mechanic thought it might need a new computer, faulty wiring in computer?? I found that I have a number of broken exhaust manifold bolts on passenger side, a couple on the drivers side. So far I am not impressed with Ford.
I have recently replaced plugs and coil packs, Oh and not to forget the rear end. Thanks in advance for your help, this forum has saved me a lot of money.
Jim D.

 

What were the codes, should say on the write-up ?

You don't have "Coil packs", you have "Coils" = CoilOverPlug (COP) Ignition on that one,-big difference. Coil Packs run more than 1 cylinder = 4 cyl on modulars.

Anyway, post the exact codes if you can. I can tell you right now tho, you need to get those studs fixed. - Need more info.

 

what brand sensors did you get? and yea like jbrew said we need the exact code(s). what did the harness for the sensor look like? (burnt? open wires? broken? etc)

 

Thanks for the quick response. The initial codes prior to O2 replacement were P0141 and P0172. After replacement code was P0141.
Yes I know I need to replace to exhaust manifold bolts, was wondering if the shorty header that Summit puts out would be a useful addition to increase torque? I tow with this thing and it is short on power.
Jim D.

 

Thew brand on the O2 sensors was Bosch, clip on. Not the splice. Wiring looked good, no burns.
Jim D.