I am having a reoccuring O2 sensor failure problem. for some reason my right O2s keep dying. I have a scanmaster so i can monitor them at all times and what ive noticed is that instead of fluctuating from 0-900 mv like they are supposed to do, they will slowing die out and read from 400-600 mv and throw off the computer which always raises my BLMs. am not home extending them or anything like that.. these are all failing on thier own. after i replace the bad one im running now, that will be my 3rd in just over a year! today i switched the O2s around to see if the symptoms followed the sensor and they did so i know this is a sensor issue but why always on the same side i cannot figure out for the life of me. something i have noticed that is a bit odd is that in the hot summer months then i use the AC, i will always get condensation falling on the hot exhaust and that O2 sensor which might be shorting it out!? that is the only thing i can think of.

whats going on

 

What brand are you using? The aftermarket non AC/Delco ones have a bad rep for failure.

That's one expensive appetite your car has.

I don't think the AC condensation is doing it. Otherwise your after cat ones would be failing on rainy days.

 

im using AC parts only. i get my parts thru Jason Cromer and the last time this happened i got another for free under warrenty.. guess theres a 1 yr on all AC stuff even if you install it yourself.

 

turbo_z,

1 year warranty?!?!?!?!? Dang I jsut ordered one from him yesterday and it has only been 2 months and mine are dead!!!!!

BTW did you ever figure out anything?? I am kind of haivng the same problem but both of my o2s after a while start getting slow and only reading 290mv-490 mv so my blms are always reading low.

And watching datamaster you can see the left o2 going from ready to not ready. When I swap them the worse of the two about scanning the mv(the left one) still scans bad on the right side, but the left o2 goes from ready to not ready no matter which o2 I have in there. But when they are new, they never went from ready to not ready. They ran good. Just when they start to act up will the left one switch from ready to not ready.

Just wondering if you ever figured anything out? What kind of headers do you have? Do you have a cat still in the exhaust.

I think I will ask for a case of new o2 sensors for christmas if I cant figure it out. They tend to last about 1.5 months

Jason

 

i got the boshe O2s and they work great, but it sounds like your sensor is leaning out thats what makes them go out, been there twice already, you should check the fuel pressure.

 

fp is good, with it idling, off, driving around. WOT. Everything looks good there. Checked for leaking injectors too, and no dice

Jason

 

Do you have LT headers? I heard somewhere that they are supposed to cause O2s to go out because they don't get hot enough. Do you have any exhast leaks anywhere? I heard that will also cause them to go out. My 02s are currently junk and I think the culprit is my exhast leak(s) on header flanges where it meets at the Y pipe. Good luck

 

I dont see any leaks around the flanges. No black marks. I might have a leak around that slip fit tube . I hate the way they made that. But both sides are in the 108 blm range.

Jason