opfor2
Full Access Member
Just wanted to confirm that GM# 2133866 is the proper upstream O2 sensor for a 2011 Tahoe.?
GM O2 sensor
- Thread starter opfor2
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yes it's $43 on rockauto, the denso is fine also 23444668 $29.79
don't be surprised if the oem one comes in a denso or delphi box
the delphi one is es20013 $40.79
truth of the matter is denso, delphi, ntk, bosch, ac delco all make 02 sensors for gm or have at some point in the past or future.
I have the denso's in mine at the moment
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opfor2
Full Access Member
I presently have Denso’s on my upstream cat , i have a persistent P219A code that maybe might be caused by my AirAid MIT #200-996 or the O2 sensor I’m going to put the OEM intake back on this weekend and see what happens and if that doesn’t work I will do the sensors.
Charlie207
Full Access Member
I have new GM (denso in the box) O2s upstream/downstream, and before swapping them out I was getting a P219A (and occasionally P219B) code when I hit close to redline. BBPerformance said it was a fueling issue, but everything was new, not leaking, healthy fuel pressure. After swapping in the new O2 sensors I dont remember getting any more P218 a/b codes.
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opfor2
Full Access Member
I have checked and rechecked ever component and I find nothing. But the GM service book said that the use of non oem o2 sensors or modified air intakes could cause a P219a code. I will swap out the intake this weekend and see what happens and if that does ent work I will swap out the two upstream o2 sensors for OEM GM from Rockauto.
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I have no idea why and bearly believe it myself but it does seem like a DENSO part and a gm part made by DENSO are different some how.
and at the same time 99% of the trucks are perfectly fine with the non oem part, others throw codes.
it makes no sense to me, but seems to be true. at this point, I just buy the oem if possible. in the past I never did.
and at the same time 99% of the trucks are perfectly fine with the non oem part, others throw codes.
it makes no sense to me, but seems to be true. at this point, I just buy the oem if possible. in the past I never did.
petethepug
Michael
Times are different. Unfortunately there’s nothing to stop a desperate or unscrupulous person from purchasing a $9.99 sensor off Amazon and returning it back to the GM part store on Amazon in the GM box they previously paid $99.00 for.
You’ve really got to be weary of whatcha get in the box these days because it could be someone else’s cheapśhit return.
You’ve really got to be weary of whatcha get in the box these days because it could be someone else’s cheapśhit return.
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opfor2
Full Access Member
I just ordered two upstream Genuine GM 2133866 O2 sensors from RA and we will see what happens when I replace the Denso's 234-4668's this week.
Tozan
Overlander
So did that fix it? or do you still think it might be the air intake tube?
Charlie207
Full Access Member
Mine were physically different.
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opfor2
Full Access Member
YES I no longer have a p219a code for months now.
kbuskill
***CAUTION*** I do my own stunts!
I will say that while I didn't have any P219A/B codes, I did have issues with my ethanol % creeping higher and higher with successive fill ups of regular (10% ethanol) fuel. Given enough fill ups my ethanol % as read by my Tech 2 would be showing around 50% which obviously was making the truck run rich on the regular fuel.
I had changed the O2 sensors prior to this problem, as preventative maintenance.
After realizing that I was having issues with the virtual ethanol sensor calculating the proper percentage, and after exhausting all other possibilities (MAF, MAP, Vacuum leaks) I decided to order some different O2 sensors.
Even though my local Advance auto parts computer said these were correct for my flex fuel truck, my truck didn't like them, and they are clearly a different design from the ones I installed that solved the problem.
New O2 sensor, that solved my issue, on the left in this pic
New O2 sensor on the right in this picture.
Both are Denso but the P-B664 gave me issues.
So there must be something to be said for the difference in the two styles.
I never had any more issues with it calculating ethanol incorrectly, but I eventually did add a physical ethanol sensor because I feel like it would have to be more accurate.
I had changed the O2 sensors prior to this problem, as preventative maintenance.
After realizing that I was having issues with the virtual ethanol sensor calculating the proper percentage, and after exhausting all other possibilities (MAF, MAP, Vacuum leaks) I decided to order some different O2 sensors.
Even though my local Advance auto parts computer said these were correct for my flex fuel truck, my truck didn't like them, and they are clearly a different design from the ones I installed that solved the problem.
New O2 sensor, that solved my issue, on the left in this pic
New O2 sensor on the right in this picture.
Both are Denso but the P-B664 gave me issues.
So there must be something to be said for the difference in the two styles.
I never had any more issues with it calculating ethanol incorrectly, but I eventually did add a physical ethanol sensor because I feel like it would have to be more accurate.
*pro tip, when replacing a 02 sensor or sensors, use the clear code function of a obd scanner or disconnect the battery briefly so the computer can learn the new 02 sensors
doing a "clear codes" even if there are none, resets the computer but not the clock/radio, etc.
this is noted in the service manual "somewhere" lol
this way it relearns the new sensors and adjusts fuel trims, etc
doing a "clear codes" even if there are none, resets the computer but not the clock/radio, etc.
this is noted in the service manual "somewhere" lol
this way it relearns the new sensors and adjusts fuel trims, etc
