OK, I had a P0150 code and went ahead and replaced all 4 O2 sensors. I had previously replaced just the fwd r/h sensor for the same code a few months ago. Since the code came back I went ahead and did all 4. Is there another sensor that the computer looks at or that could be giving it a false input. I changed the MAF sensor, crankshaft position sensor and the plugs/wires about 6 months ago or so. At that time is when I did the initial r/h fwd sensor.
The SES light came on today after about 20 min of driving after all 4 O2 sensors were replaced.
Any help would be great, I have a 12 hr drive from AL to TX in about three weeks!!!
Thanks
Rob

 

Also my OBDII reader has a live mode to look at everything while driving/running, is there anything specifically I should be looking at?

 

c'mon some one has to know something.

 

150 is for your r/f 02 sensor circuit, not an 02 much less all 4 02's.
You may have a wire harness issue, so quit replacing parts that are not needed.

 

I replaced all 4 b/c last time I had this issue it was suggested by you that I replace all 4 due to mileage:
"As an 01 you are probably close to 100,000 miles and if so you should replace all 4 at the same time. What other fault codes did you have prior to installing one 02?"
Mike
I have no other codes and need some way to isolate this issue. I am on a limited time schedule due to the fact that I am military, in training, and about to PCS to TX.
Thanks for the help
Rob

 

I haven't seem any mention of mileage at this post.
If you have a high miler, yes 02 are recommended, but the 150 code is a separate issue, one is not getting the proper signal to the ECU and if I remember right there is a TSB that was released by Rover for the 150 fault issue.

 

Yes you are correct mileage was not mentioned in this post. My point was I was not just throwing parts at it to hope for the best. This code has plagued me for a while and has been intermmitent. It has come and gone with prior maintenance and I thought I had it this time because the truck is running good.
I searched for the TSB but did not find it, any suggestions??
I did find some info on my maint cd on the connector wiring as well as the grounds for the O2 sensors. It shows the O2 sensors tying in with the camshaft pos sensor. Would that have anything to do with it???
Thanks for the help
Rob

 

I am going to have to do a little homework and get back to you.
How is it currently running?

 

Right now it is running good. The only sign of the prob is the smell of the exhaust seems to be rich.

 

Crawl under the truck and chack the connector again. Look at the pins inside and follow the leads up to the engine compartment. This is a good location for the wires to lay on the cat. Make sure you don't have burnt spots..