Can't determine if my truck uses one or two oxygen sensors

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  #1  
Old 10-12-10, 08:13 PM
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Can't determine if my truck uses one or two oxygen sensors

I have a 92' Ford Ranger XLT with 2.9 V6 engine. The mechanic was doing unrelated suspension repairs and I remarked that I'd like to replace the oxygen sensors. I already purchased the two sensors that the auto parts store said my make/model required.

The mechanic said he could not find two sensors, only one. Well, my Chilton's manual says 91-95 V6 Rangers use two sensors. So I get under the truck and check the exhaust system from manifold to muffler. I even reached into hard to reach places that were hard to see.

I'll be darned if I couldn't find two sensors. I only located a single one in the Y-pipe, same as the mechanic. Does my make/model employ one or two sensors?

Thanks,
Dave
 
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Old 10-12-10, 09:13 PM
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'i' am not a driveability-guy.
but i am fairly sure that all 'efi' systems use an o2 sensor (1-for each cyl head)-2 on a v6-just after / or in the exhaust manifold.
then one after the cat converter.
total of 3.
 
  #3  
Old 10-13-10, 07:09 AM
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Hey, thanks for replying. I found two or three threads on the Internet that said my my make/model just uses the one sensor at the Y-pipe junction forward of the first cat converter.
 
  #4  
Old 10-13-10, 07:15 AM
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quite possible- the early efi system is not monitoring the individual banks(sides of the engine) for air/fuel ratio-or cat converter performance either.
 
  #5  
Old 10-13-10, 10:43 AM
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bluesbreaker,

Your Ranger has a single 4 lead heated 02 sensor.

“OE” part numbers below.

Use one of these part numbers.

Obivisiouly not both.

FO9Z- 9F472-C
FOTZ-9F472-C


Do not use a universal or aftermarket sensor on your truck.

Sensor must be “OE”.

Using a universal or aftermarket sensor will positively set error codes.
 
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