the service truck threw a CEL, and i pulled oxygen sensor performance bank one sensor one code.
that would be driver side sensor between the manifold and cat, rite?
don't want to change the wrong one

 

Is this a gasser or a diesel? No oxygen sensors on a diesel as far as I know, but then again I didn't sleep in a Holiday inn last night either.

Smart ace aside, what was the code you pulled?

 

don't remember the code. and yes diesels have 4 o2 sensors, 2 before the cats and 2 after the cats.

 

Ok, I guess I'm confused. Not aware of any catalytic converters on these diesel engines either. Here is what I know to be on the exhaust:

http://http://www.powerstrokehub.com...emissions.html

Is it possible you got a code definition for a gasser instead of diesel?

 

The DOC (Diesel oxidation catalyst) is for all intents and purposes a catalytic converter. Without crawling under my truck, I won't swear to the presence or absence of any O2 sensors, but post turbo, I only recall disconnecting 4 EGT sensors, a DEF injector and a NOx sensor to remove the exhaust system.

 

if there are no cats, there is something in the exhaust between the turbo and muffler.
i assumed it was a cat.
and i can see the confusion.you are correct, i described my 6.2 engine.

i am going on what was done to this truck when it was 3 months old. the engine shut off and the dealer said it was one of the o2 sensors. only that time they replaced all 4 of them instead of testing each one because it was a friday afternoon on a holiday weekend.
they replaced 4 sensors and we had no other problems with the truck until the CEL came on yesterday afternoon.

 

I bet they replaced the 4 EGT sensors at that time. If you can get the code, we can try to help!

 

Forgot to add, that if one of the egt sensors is going bad, the code usually identifies which one. Those sensors can be had for about $40 online. Pretty easy to replace assuming it hasnt siezed the threads. A lot of penetrating oil and a good soaking usually helps.

EDIT:. Rereading your original post, maybe the code you got is for egt11, the first one post turbo.

 

checked scanner, i did not clear codes .
P164A
P20B9
P20BA
P2A00 oxygen sensor circuit range / performance, bank 1 sensor 1

 

For p164a abd p2a00 I do find references to nox sensor here:

https://www.ford-trucks.com/forums/1143614-tsb

the others I bolded above. Related to def system?

 

Look at the 6.7 goffee table book and see if it shows the O2.

Coffee Table Books

Also might check the OBDII for your year truck and see what it says.

https://www.motorcraftservice.com/freeresources/obd

 

we never got to the F550 yesterday or today as we spent both days working on the 05 Kenworth.