Hey guys, about a week ago my truck got an engine code P0141. So I changed the O2 sensor by the cat. That made it go away for about a day and then the same code came back on. I changed the other sensor thinking I changed the wrong one and again the light went off for about a day and came back on. I really don't know what else to do. Has this happened to anyone else before? My truck by the way is a 2001, standard cab, 2.5 manual.

 

https://www.ranger-forums.com/forum2...o141-code.html

 

you have to hook up to a really good scanner to find your exact problem. i have access to a snap-on scanner when im having a lot of trouble with codes

 

I've looked and I don't see anything wrong with the wires connecting to it or anything. I really don't want to have to pay someone to look at it.

 

Could it be that the cats failing? like plugged up enough to not register a reading in the O2 sensor?

 

That's what I'm thinking. How hard are they to change?

 

Could be several things, check for a vacuum leak.

 

Could a vacuum leak throw P0141?

 

P0141 means the heater circuit is failing.

HEGO sensors have internal heaters, that's what 2 of the wires on the sensor are for (H is "heated" in HEGO). If the sensor is new then you probably have a short, or an open circuit between the pcm and the sensor itself.

 

Nevermind, I thought it was P0171

 

With the P0141 your getting your truck will run and work fine, its just that second HEGO is malfunctioning. I bet there is a problem with the wire.

 

How would i go about testing or replacing it?

 

Use a meter.

 

Well finally bit the bullet and took it to the dealership. One of the wires from the harness was rubbing on something and causing it to throw the code. They said $900 and they would replace the harness and $400 they would fix the wire. I told them not to do either. When I picked it up I asked the guy to show me where it was rubbing and he showed me but you can't really see it because its behind the manifold. He said I could just insulate it myself and it should be fine though. I think they may have moved it to where it won't rub anyways though because the code didn't come on when I drove it home. Anyways that's what was wrong in case something similar happens to someone else.

 

Wow! $400 to use some simple 12-volt circuit knowledge, a multi-meter, and maybe have to splice a wire! I need to go work for a dealer!

If you're brave, get underneath and do a good inspection. If what the dealer said is true, you'll be able to find a deficiency in the wire insulation either visually or by running your hand along it if it's not visible. If I remember correctly, this particular part of the wire harness is almost impossible to get to without removing the cat or the transmission, either of which can be done in a short amount of time with a few good air tools.

If the dealer electrical-taped a spot where the insulation was rubbed off the wire and secured it so it won't get damaged again, you probably have nothing to worry about. Let us know if the code comes back and I can post some pictures of the harness with the engine and tranny removed so you know what to look for.

 

Most of that money goes to the dealer itself, not the employee.

 

215$/Hr for tuning.... wow I feel like a bandit