On my 2005 f150 they're 4 cats and i was wondering if all of them have O2 sensors on them or not thanks.

 

None of them do, never have as far as know. O2's sensors are in the exhaust piping before and after the converters - not on them.

Like this -

 

Only the '04 + have the second set of 02's on the cats.

 

Huh, I dunno, not in this diagram either :o -

Heated Oxygen Sensor (HO2S) and Catalyst Monitor Sensor — Exploded View, 2004 - 2006, 4.6L (2V) and 5.4L (3V)



Item Part Number Description

1. 14A464-Heated oxygen sensor (HO2S) electrical connectors (2 required)
2. 14A464-Catalyst monitor sensor electrical connectors (2 required)
3. 9F472--HO2S (2 required)
4. 9G444--Catalyst monitor sensors (2 required)

 

Well, that's strange -Now I find this.

5.4L (3V) Engine



Item Part Number Description

1. --- 5A212 Extension pipe and exhaust clamp
2. --- 5230 Muffler
3. --- 5A281 Exhaust coupler
4. --- Exhaust clamp
5. --- Electrical connectors (4 required) (part of 9F472)
6. --- 9F472 Catalyst monitor sensor
7. --- 9F472 Heated oxygen sensor
8. --- Catalytic converter-to-manifold nuts (4 required)
9. --- 5E212 LH catalytic converter
10. -- 5E212 RH catalytic converter
11. -- W505436-S426 Exhaust hanger bracket bolts (6 required)
12. -- Exhaust hanger bracket (rear)
13. -- Exhaust hanger bracket (front and center)
14. -- Catalytic converter isolator
15. -- Catalytic converter hanger bracket

 

Mine is the same was your second diagram. For the 5.4 3V that is.

 

Yea , I guess there's two different set ups according to that manual. I thought maybe one was for the 4.6 and the other was the 3 valve 5.4. According to the manual, they show two systems for both.

I duno, but yea, that last one shows the O2 tapping into the converter

 

alright thanks for the diagrams

 

the 2nd diagram is for the 04-05 trucks with 4 cats, the 3rd diagram is the 05+ trucks that come with only 2 factory cats.