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Throwing a code P2251.

Tight Lines

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Jan 18, 2014
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Missouri
Wondering if someone can help pinpoint exactly which O2 sensor may be bad with this code P2251. The first time I saw this code was after we put in the Driveshaft which the off-road Hpipe had to come off and be readjusted. That was around a month ago. I got under the car and messed with a couple of the O2 connections and cleared the code. It didn't come back until last night while making a trip to Mexico. I am leaning towards the first O2 sensor on the passenger side as that one is twisted and is a tight fit. Would like to see if anybody would know as I would rather not be guessing. Is there a way to check/monitor which one is bad? Should I not drive it? Thanks for any help.
 

bikrboy128

Some say.....
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Jul 15, 2007
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Wheaton
p2251 is a code for bank 1 sensor 1 O2 sensor, which is the passenger front o2. you say the wiring is twisted? i would unplug and straighten the wires out, then make sure the wires didnt pull out of the connector.
do you have a scan tool/tuner that can monitor o2 voltage readings?
 

Tight Lines

TCG Elite Member
TCG Premium
Jan 18, 2014
2,147
1,316
Missouri
p2251 is a code for bank 1 sensor 1 O2 sensor, which is the passenger front o2. you say the wiring is twisted? i would unplug and straighten the wires out, then make sure the wires didnt pull out of the connector.
do you have a scan tool/tuner that can monitor o2 voltage readings?

I tried logging through the SCT but couldn't find a PiD to monitor the voltage only temps of the O2's. I did try to untwist the wires but couldn't get to the electric connector side to check wires as it is above the trans and inaccessible with the trans in place. I am going to do a clutch and drop the trans, I can change out the sensors than. I was hoping to only do the one that you stated instead of both front O2's as they are $200 a piece. I may just do the one while the trans is out and pray that was the one. I do appreciate the reply. Probably shouldn't drive it even the AFR looks good, however it may only take a she on for something to get screwed up. It did run good last night.
 
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