All 4 O2 Sensors Dead?

[black96vert]

Hello everyone,

I'm new to this forum and I'm having a problem with a 98 Sport with the OHC 6. The check engine light came on a couple of weeks ago. I checked the codes and they were lean bank 1 & lean bank 2. I then checked the O2 sensors and all four read 0V all of the time! Has anyone else had this problem? I find it hard to believe all four sensors would be completely dead. I also have the dreaded ping under light load at 2500 - 3000 rpm. The engine has about 103,000 miles. Any info would be appreciated.

 

[Skibug]

It is common that when one O2 sensor begins to fail, that the others are soon to follow. How, many miles on your truck? Two of mine went bad at 98,000 miles. I went ahead and replaced all four.

Oh and welcome to the forum. Lots of usefull information. Do some searching.

 

[Glacier991]

You have some form of electrical problem is my guess. All 4 sensors will not fail at the same time, and they are not inter-related. When giving coedes it helps to give us the numbers... I am making the assumption you have PO171 and PO174. Do a search on the codes and you will find out all bout some recalls, but at the same time I cannot imagine all 4 sensors going at the same time.....has to be some electrical problem.

 

[Eneurb]

I agree. If you have had all 4 sensors fail all at once, I wouldn't leave the house, 'cause there's a good chance you're gonna be struck by lightening!

 

[black96vert]

Thanks for all the suggestions. I'm going to check fuses and wiring first. Then I'll replace one sensor to see if I can read a voltage on it. If that works I'll replace the other three. I'll be doing this indoors to avoid any lightning bolts.

 

[Eneurb]

Check the wiring to the drivers side upstream sensor for a heatshield that has fallen off the pipe and possibly worn through the wiring shorting it out, causing the heater fuse to blow.

 

[black96vert]

The fuse is fine. I haven't crawled under it yet due to the snow we got last night. I need to move somewhere warm.

 

[The"X"]

All the O2's on mine were coding lean. My fuel filter was mostly clogged. Never been a problem since.