Oxygen Sensors Help
- Thread starter YukonBill
- Start date
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FrankU
Full Access Member
There is no need to change out the oxygen sensors. The ecm will let you know if there is a problem with any one of them , when the check engine light lights up.
afpj
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For the most part there is no set time or mileage to replace o2 sensors. When they're dead, you'll get a code, but as they're failing you may not get a code or get a catalytic inefficiency code or something like that. For these old beasts it pays to get a code reader that can also read real time data (like an ELM327). Then you can see if the voltages are reading correctly on the sensors and replace as they start crapping out, before a code is thrown.
dmperfection
Member
Now I'm no ASE master mechanic, but its my understanding that O2 sensors have been considered maintenance items for several years now. They do get old and sluggish and affect how quickly air/fuel changes occur. You won't get a code as they get old and catalytic converters are affected. At about 200k on my Tahoe, I dropped $2,300 on a new GM full catalytic converter replacement and was told that my old O2 sensors played a significant part in one of my cats failing. I live in CA and smog is no joke. If you price O2 sensors online, you can find all four for under $300. Cheap insurance.
Gzes
the drifting 2dr
Just replace them when you get to them. I've had bad o2 on mine for a few years. Will do them when I feel like putting my long tubes in
livingez_123
Full Access Member
If you have the money to spare, and the time to replace them, than any time after 100k would be just fine. Most people on this site ( just seems this way by reading the threads) will wait until they get a code or start having problems before they do anything. I believe that is the wrong way to think. Preventive maintenance is a great thing, because peace of mind is priceless. There is nothing better than starting a 3k road trip knowing that most of your bases are covered. Also, fuel pumps should be replaced after 100k, again, why wait until it strands you hundreds of miles away from home? Hub bearings are good to 100k, but a bunch go out before that and some hang in there for much longer.....why wait? Tires, how many for you guys run them to the markers? how about until the belts show it spots? non of you will admit to it, but again why wait. Breaks are no different, why wait until they start to squeal, changed them early and save your rotors. preventive maintenance will save you money in the long run.
unnecessary
Good thing some people actually like to help others instead of laughing at them. Not sure if you have posted helpful remarks in the past, but honestly, your remark is disappointing. Please don't take the time to laugh and mock when one is trying to learn.
Thank you.
Good thing some people actually like to help others instead of laughing at them. Not sure if you have posted helpful remarks in the past, but honestly, your remark is disappointing. Please don't take the time to laugh and mock when one is trying to learn.
Thank you.
SLCHOE
ASE Master Certified + (L1)
Why do you ask?
Are you asking because you have codes? If so which codes?
These guys that dont know shit like to laugh about questions like this but 02 sensors do get less accurate as the miles climb and it is actually a good thing to fork up some money at about 100K for 4 02 sensors rather that having to have to pay for 2 new cats and the labor cost to replace them (and if youve gone that far, 4 new 02 sensors). Your engine will run better and everything in the combustion chamber on downstream will benefit from it.
The ones on the manifolds measure air/fuel mixture and the PCM responds by way of fuel trim. The ones after the cats only measure cat efficiency.
Last edited:
I have cel and replaced all o2 sensors....light went off after driving about 10 miles. Then back on. I need to go back through inspection and im stuck
---------- Post added at 01:33 PM ---------- Previous post was at 01:32 PM ----------
O2 tahoe 5.3
---------- Post added at 01:33 PM ---------- Previous post was at 01:32 PM ----------
O2 tahoe 5.3
afpj
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What code(s) you got?
P0430
---------- Post added at 02:16 PM ---------- Previous post was at 02:09 PM ----------
On initial inspection i had code p0137 and p0153. My brother changed one of the sensors. Codes still present. I order 3 more sensors and had those installed. 1st 2 codes disappeared and now its p0430. I believe that the sensor changed by my brother was changed again and 1 old sensor is still there. I am going to purchase 1 more sensor and have the same guy do the work so he knows what was changed and what he hasn't changed.
---------- Post added at 02:18 PM ---------- Previous post was at 02:16 PM ----------
Im just praying its not the converters. I just renewed my insurance and cant afford that right now. I have to get it through inspection or face failure to make repairs tickets at 145.
---------- Post added at 02:16 PM ---------- Previous post was at 02:09 PM ----------
On initial inspection i had code p0137 and p0153. My brother changed one of the sensors. Codes still present. I order 3 more sensors and had those installed. 1st 2 codes disappeared and now its p0430. I believe that the sensor changed by my brother was changed again and 1 old sensor is still there. I am going to purchase 1 more sensor and have the same guy do the work so he knows what was changed and what he hasn't changed.
---------- Post added at 02:18 PM ---------- Previous post was at 02:16 PM ----------
Im just praying its not the converters. I just renewed my insurance and cant afford that right now. I have to get it through inspection or face failure to make repairs tickets at 145.
