180K miles - do O2 sensors?

[dictum]

Have 2 GMC Yukon Denalis.. both have same mileage, 180K.

One is a 2007, the other 2013 XL.

The 2007 one recently spat out a O2 sensor code, on one sensor. Got it replaced, code cleared. But this raises the question, should I replace the other O2 sensor which never threw a code.

And on the 2013, no codes but I am having a guy rebuild my front end and that would be the time to do both O2 sensors, because I heard that after 100K they get "lazy". The 2013 is a bit sluggish from stop lights but has no issues at higher speeds. I wonder if lazy O2 are the reason. The 6.2L motor has only 40K on it so it's doubtful it's something engine-related.

I know that sensors can work intermittently / semi-functionally without throwing a code.

 

[Fubar0715]

My 2013 started throwing O2 sensor codes around 125k miles - I opted to replace all 4 at once as I wanted done and dusted. Was not difficult to do and I highly recommend using OE parts for this repair.

 

[dictum]

Makes sense

 

[donjetman]

Changed our O2 sensors at around 180k on our 07 Denali before they gave us any code/trouble.

 

[Geotrash]

I consider the O2 sensors routine maintenance every 100k

 

[dictum]

All 4?

 

[Marky Dissod]

All 4 (O2 sensors)?

So long as the front O2 sensors behave properly, and never throw any 'rich' trouble codes, then the rears have likely spent their entire lives reporting 'lean' / BELOW 0.45 Volts.
IFF the rear O2 sensors have spent their entire service lives 'lean', it'd be acceptable to leave the rears be.

That said, some find it more convenient to replace all four while they're down there.
In that case, I'd save the rears just in case.

 

[Atrevino0497]

At around 128k is when I got a p015d code so I replaced the sensor and a month later exactly on Mother’s Day I got another code for the opposite bank both upstream. So I came to the conclusion I’m replacing the other 2 while I’m at it.

That would be your best bet also is to replace all at the same time. You wouldn’t even need to put it on jack stands except for upstream bank 2

The hardest one to get to would be the upstream on bank 2. It’s easier to take off the tire and the wheel well liner for sufficient room.

Bank 1 sensor 1 I cut the wire off and used a 22mm long wrench and came out perfect after spraying on pb blaster.

The upstream bank 1 sensor is hidden above the driveshaft under the driver side and sensor 2 is right there in plain sight.

 

[OR VietVet]

Do all 4 sensors each time.

 

[Mickey_7106]

These trucks have 4 sensors? Thought only 3 because of y pipe

 

[Mickey_7106]

I googled it. Thought there was only 1 after the third cat

 

[OR VietVet]

I thought that you had two cats with a sensor in front of and behind of each. Before the Y there is a cat on the left and a cat on the right. A sensor in front and a sensor in back. I looked at pics of all 3 available engines for your year. You did not supply that info so I had to do extra work. You will get my bill in the mail.

 

[Dustin Jackson]

Is it worth doing just O2 sensors or should the cats be done also?

 

[Doubeleive]

Is it worth doing just O2 sensors or should the cats be done also?

depends on how you drive, if you drive like a normal person they should last the life of the vehicle

did all 4 sensors on mine at 98k will do all 4 again at 198k currently at 165k
never had a 02 code on this vehicle yet, got a cat code and replaced both cat's at I think around 120k, then had to replace the left one again about 6 months ago because the material inside broke apart so it sounded like a mason jar with bolts in it getting juggled around.

 

[Mickey_7106]

Are bosch good sensors? I only see gm downstream sensors for my 09 5.3 on rockauto

 

[OR VietVet]

You can use the Delphi sensors as well. I have never had a problem with them.