Have an issue with my 98 Expy 5.4L. I have a CEL (P0141) I'm attempting to resolve. Replaced sensor and reset the computer. A few miles later...same code. Is there a fuse for the heater circuit, and what is the best way to clean those hard to reach blue connectors.

HANDS DOWN - BEST FORUM EVER!

Thanks all!

 

Which O2 sensor did you replace, passenger or driver's side, before the cat or after it?

 

Well, I understand P0141 is bank 1 sensor 2 , so I did some looking on other posts and some asking around to find that it was driver side post-CAT.

Good grief, I hope I didn't replace the wrong one

 

Bank 1 is passenger's side.

 

You did! Bank 1 is always the side of the engine that has cylinder #1. In our case with these 4.6L and 5.4L engines, cylinders 1-4 are on the passenger side. If you still have the one that came out, it's obviously good and can be used.

 

Welp, I guess I will be doing some sensor swapping soon. I will keep you posted! Thanks for the info! Between the research and actually installing the sensor on, I must have had an episode of dyslexia. Oh well...it happens. And yes, I did keep the old one for that very reason!

 

Welp, it looks like that did the trick! No more CEL! Next on the project list is COP replacements! Holding on to ye ole pocketbook for that one. Thanks for all the help, everyone!