When to change 02 sensors?

[dbperformance96]

At what point should you change 02 sensors? I have heard that if they are switching back and forth they are ok. But other people say to change them at 100,000 miles. Truck in question is a 1997 K3500 with the 7.4L Vortec. I have 140,000 miles and have not changed them. Do they actually wear out? Thanks in advance for your help.

[GM-Tech]

They can get "lazy" when they get old, but I can't give you a mileage figure. I'd wait until you get an SES light with a code for one of 'em, unless you have money to spend and don't know what else to do with it.

[gwh1bass]

anyone?

[Norseman]

How would you know if they are getting lazy?

 

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When they set a code. You could look at their switching with a tech 2, but eyeballing this and saying they're lazy is a difficult, if not impossible, thing to do.

 

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Just let them go until you get a SES lamp, why create problems?

[SPARK CHASER]

They can get "lazy" when they get old, but I can't give you a mileage figure.  I'd wait  until you get an SES light with a code for one of 'em, unless you have money to spend and don't know what else to do with it.

 

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How would you know if they are getting lazy?

 

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If it is an O2 sensor that is mounted the exhaust manifold or immediately after, your truck may develope a "rotten egg-sulfur" exhaust smell. The sensors on just before and after your catalytic converters are for sensing if the converters are doing their job and you will just have to wait until they fail and trigger an obdII code.

[GM-Tech]

How would you know if they are getting lazy?

 

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When they set a code. You could look at their switching with a tech 2, but eyeballing this and saying they're lazy is a difficult, if not impossible, thing to do.

[gwh1bass]

[

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If it is an O2 sensor that is mounted the exhaust manifold or immediately after, your truck may develope a "rotten egg-sulfur" exhaust smell. The sensors on just before and after your catalytic converters are for sensing if the converters are doing their job and you will just have to wait until they fail and trigger an obdII code.

 

 

 

Sorry to bring up an older post, but searching for info on diagnosing the rotten egg odor I'm getting while towing my trailer.

 

No service engine lights, so I'm assuming no codes are set.

 

Don't know what to think.

[jhm]

They can get "lazy" when they get old, but I can't give you a mileage figure.  I'd wait  until you get an SES light with a code for one of 'em, unless you have money to spend and don't know what else to do with it.

 

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How would you know if they are getting lazy?

[jhm]

They can get "lazy" when they get old, but I can't give you a mileage figure.  I'd wait  until you get an SES light with a code for one of 'em, unless you have money to spend and don't know what else to do with it.

 

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How would you know if they are getting lazy?

[gmcjoe]

I lost one this past summer with over 150K miles on my truck, the Left Front.

 

If you want to be proactive and have some dough to blow, go ahead and change them. Otherwise wiat for the SES lamp