Hi all:

It's been a while since I posted to the forum, but found my last exchange very helpful.

I've got a new problem, and am looking for suggestions on how best to fix.

I'm getting two Diagnostic Trouble Codes

P0132 "O2 Sensor Circuit High Voltage"
P0135 "O2 Sensor Heater Circuit" (pending)

Obviously they have to do with the O2 sensor. But beyond that?

Some questions: 1) What is the most likely culprit, 2) What is the most likely fix of the problem, and 3) if replacement of an O2 sensor is suggested, how many are there, where are they located, and which one should I replace?

Thanks in advance for any suggestions.

Al Thorp
Great Barrington, MA

 

1) Faulty O2 sensor or broken/disconnected wires.
2) BradBeyer just sent me this link; great O2 sensor info.
http://www.gnttype.org/techarea/ecms...O2sensors.html
3) Don't know your year/engine particulars. But there could be 2 or even 4--one on each side of the cat. or cats.
WC

 

Thanks for the tip. And the link is great, lots of good info. Just getting into it. I've got a Chilton's manual for the truck. Will look up how many O2 sensors there are for my 5.2 L V8 engine.

Again, thanks.

 

So when I'm getting a high voltage from the O2 sensor, this typically means, IF the sensor is working correctly, that the fuel mixture is too rich, consuming all the available oxygen in the air fuel mixture, and producing an exhaust gas with almost no oxygen, which in turn produces a high voltage signal to the PCM.

 

On Saturday, I was going to remove the O2 sensors, but noticed that the truck was running better AND that the engine light was no longer on, without my doing a thing. So, I decided to postpone the task.

But, ALSO, I noticed prior (on Friday) that a LARGE volume of water dumped out of the exhaust pipe when the truck was going uphill, at about a 10 percent grade. More water than I have EVER seen come out of an exhaust pipe. I would imagine that a large amount of water in or around the O2 sensors might affect their performance.

Also, I'm now wondering if something more severe is going on....cracked head gasket, engine block, etc.????? Any thoughts??

Thanks.