Changing an O2 Sensor...? - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 06-27-2005
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Changing an O2 Sensor...?

Got a CEL last weekend... checked it this week is an O2 Sensor (senser 2, bank 1) so my question is, is there a trick to changing these things? Special tool? Procedure? Do they just thread in and plug in? Thanks!

PS.. I know I know, I should know this but its slipped my mind, which side is Bank 1? Left or Right?
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Old 06-27-2005
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bank one should be right. the o2 sensor is on the exhaust pipe you just take a wrench and unscrew it un plug it and reverse for the install
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Old 06-27-2005
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we're talkin' Right as in Passanger correct..?

If you can get it out with just a wrench, then whats the purpous of the special tool?
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OK the bank one usally is the DRIVER SIDE. but if we cant get claification usally O2 sensors are cheap and you might just want to replace both to be safe.
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Unplug the the O2 Sensor wire(s). Access to the O2 sensor plug(s) may be obscured by the transmission. If you are unable to unplug the O2 sensor(s), the O2 sensor may be removed by CAREFULLY unscrewing the O2 sensors with the wires attached. Note that if you take this short-cut, you run the risk of breaking or twisting off the wires. (Also note that if you opt for this short-cut you will also need to pre-load (twist) the wires so that the wires are not excessively twisted when the O2 sensors are screwed back) Remove the O2 sensors using either a box wrench or a special O2 sensor socket which can be purchased at most auto parts stores. Take care not to drop or jar the O2 sensors.
ok the "special" tool is a O2 sensor socket it has a slot cut in it for the wires really just unplug the O2 sensor FIRST and slip a boxed end wrench over it and it will do the same
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Old 06-27-2005
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Quote:
Originally Posted by Redneckstone
OK the bank one usally is the DRIVER SIDE. but if we cant get claification usally O2 sensors are cheap and you might just want to replace both to be safe.

ok the "special" tool is a O2 sensor socket it has a slot cut in it for the wires really just unplug the O2 sensor FIRST and slip a boxed end wrench over it and it will do the same

Ok, Right and Left is typicly gauged by sitting in the driver seat (driver left/passanger right)

I should be able to do it with an open end then...

I dont know about *cheap*, 45bucks each...
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Originally Posted by rngprerunner
Ok, Right and Left is typicly gauged by sitting in the driver seat (driver left/passanger right)
when your talking about engine, you usauly look at it as standing infront of the vehical. but thats always debated about.

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I should be able to do it with an open end then...
DONT ever brake a bolt/sensor loose with a open end you run the risk of striping it. just unplug it and put a closed end on. you get more torque with it.

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I dont know about *cheap*, 45bucks each...
OUCH i think mine was like $15 or something.
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Old 06-27-2005
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Quote:
Originally Posted by Redneckstone
when your talking about engine, you usauly look at it as standing infront of the vehical. but thats always debated about.
Its allways confused me too.. but all the classes I'v taken I'v learned the *industry standard* is from the driver seat and the applies bumper to bumper...

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DONT ever brake a bolt/sensor loose with a open end you run the risk of striping it. just unplug it and put a closed end on. you get more torque with it.
Good call..

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OUCH i think mine was like $15 or something.
That would be nice.. if they were that much I'd replace all four.. these things are a rip nowadays...
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Old 06-27-2005
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Originally Posted by rngprerunner
Its allways confused me too.. but all the classes I'v taken I'v learned the *industry standard* is from the driver seat and the applies bumper to bumper...
ya in two of my auto classes they sayed one or the other never really got a striaght.

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That would be nice.. if they were that much I'd replace all four.. these things are a rip nowadays...
ya i remeber my 1986 f-150's we're around $5 my escort's was like $35 haha
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Old 06-27-2005
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Quote:
Originally Posted by rngprerunner
I know I know, I should know this but its slipped my mind, which side is Bank 1? Left or Right?
In this case, it is neither left or right.


Bank:
1= PS
2= DS

Sensor:
1= before cats
2= after cats


So, on a Ranger, since there is only one sensor after the cats, "sensor 2, bank 1" is the single sensor after the cats. (It may be after all of the cats or after some of them, which is the case on most late model Rangers)

In this picture, the Ranger sensor array corresponds to the second drawing down.
Sensor 2, bank 1 is "HO2S 12"



Similarly, spark plug numbering on Fords uses the PS front cylinder for the #1 spark plug. Seems counterintuitive to me but that's Fords convention.
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Old 06-27-2005
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Cool deal, guess I know what I'm doing tonight...
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$45 isnt bad for a 4 wire heated sensor. be glad you dont have a volkswagen....
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Quote:
Originally Posted by rngprerunner
Cool deal, guess I know what I'm doing tonight...
Just be sure that you get the rear sensor. I think the connector shells are keyed differently and the front O2's won't interchange.
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Old 06-27-2005
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i would want to know what the code number is before i wasted money on a sensor that may not be needed
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Originally Posted by 04 EDGE
i would want to know what the code number is before i wasted money on a sensor that may not be needed
well, I had a picture of it (for an upcoming How To) but I formated the camera with out gettin it off.. DOH!

But I used a code reader to get the code... didnt just pull that it needed an O2 sensor out of my *** you know...
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Old 06-30-2005
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The OEMs are keyed differentl, but it's the exact same sensor for a HEGO or CMS. If you look at the Bosch, who makes the OEM, they put a generic non keyed connector so you can use it front or back. Only difference is the wire lenght.

If you are using an oem the HEGO, pre cat, has a grey connector and the CMS, post cat, will have a blue 80% of the time or a pink/purple connector


I just had to replace the 21 and 22 sensors in my wife's Windstar after doing a tranny swap last week because her 3rd gear one way clutch took a crap at 81k.


Quote:
Originally Posted by rwenzing
Just be sure that you get the rear sensor. I think the connector shells are keyed differently and the front O2's won't interchange.
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  #16  
Old 06-30-2005
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P0155/P0156 for bank 2 and P0153/P0154 for bank 1 are HEGO circuit failure codes.


Quote:
Originally Posted by 04 EDGE
i would want to know what the code number is before i wasted money on a sensor that may not be needed
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