'98 Protege SE 1.5L getting a P0141 on scanner

[Rileysowner]

We have been getting a check engine light for a while. I finally got around to purchasing a scanner and found it throwing a P0141 code -- O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2).

Reading that makes me think that there are 2 O2 sensors, one before and one after the cat. However, while I can find the first one, I cannot find a second one.

Anyone know if there is a second one, and if so, where can I find it. I have the car up on stands right now to fix another leak in the exhaust and would like to at least find the O2 sensor that is causing the problem, if not fix it.

Jim

 

[grey1]

P0141 code -- O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

yes you can get it from under vehicle. or follow the pigtail of sensor 1.
...the connectors are next to each other ...sensor 2 is the 4-wire

it might be unplugged or broken wire or bad sensor... or just a Fluke. Clear it and see what happens

--------------- -------------- --------------- ------------
I swear my '96 is just a sassy b**** with the check light. I accidently missed
4th gear and hit Reverse...nnngggkkk! , then while looking at the dash I actually saw the light come on. Was P0420. I think it hurt her feelings and that is how she reacts.

 

[grey1]

or follow the pigtail of sensor 1.
...the connectors are next to each other ...sensor 2 is the 4-wire

.

uh, that's how a '96 is...so yers might be the same, or different.

 

[nativebackup1]

on my '97 1.5 the second sensor was easy to replace-i had it on lifts though.... all i had to do was unplug the old one, then plug in new one. the second one costs less too. hopefully its clears,if not hopefully its your second sensor. good luck

 

[Rileysowner]

I cleared the code already and it pops up again after 10-15 minutes of driving. Could be a wire, but I will have a look when I get under there this morning. Thanks.

 

[nativebackup1]

you know, i have the same problem-my check engine light is on so i replace caps rotor plugs and wires(it was reading a missfire). that didnt help-then i replaced the 1st and 2nd o2 sensors. the check engine light is still flashing! i also disconnect the battery after everything i do-it still comes back! whats wrong with it!?

sorry for the thread jack-i was just letting you know my similar problem with my check engine light-lolz

 

[Rileysowner]

Thanks for the help, I did find the first O2 sensor. I didn't know the Protege had a cat up in front of the engine (insert shocked smiley). I thought the second O2 sensor was the 1st O2 sensor. I was dealing with an exhaust leak yesterday, but have started to price out O2 sensors. Wow! They are expensive, especially that second one.

 

[mannydingo]

Pray to THE GOD that the 1st one doesn't go while you're the owner of the car. It's a major pain to get that one out. You would have to remove some parts and that's WITH a oxygen sensor socket.

 

[Rileysowner]

So I noticed. I can't imagine how much would have to come out to even access it. I got the sensor yesterday, and hope to install it later today.

 

[Rileysowner]

So, the sensor seems stuck fast. I worked at getting it out for almost an hour and could not get it to budge. Any suggestions on how to get it to move as I would like to get a new one on before we head out on vacation so I don't have that task waiting for me when I get home.

 

[mannydingo]

You probably did it with the exhaust cold. Driver the car around the neighborhood until it heats up. Get back under and try it again. Now you just have to keep from burning your fingers, hands, and arms. Be careful.

 

[Rileysowner]

Ok. You are correct, the exhaust was cold. I will have to take it for a ride and see if that helps.

 

[Rileysowner]

Ok, got her done. Gave it a good long drive to really heat the exhaust (and pick up a 7/8" socket. Put the 7/8" socket on my breaker bar, and a good hard tug, off she came.

The only annoying thing was the NKG O2 sensor came with instructions that were for two different types of O2 sensors (different gaskets on them) with two different torque specifications. I chose the higher value of the lower one as there was nothing on the sensor of the box indicating which type it was. Something like 17 ft/lbs.

Took her for a test drive after getting the new one hooked up, and no check engine code.

 

[mannydingo]

Hurray! Don't you just love it!(flash)

 

[Rileysowner]

Yup. It is great when things come together. Now to finish fixing the exhaust leak a little further back. Then some body work. Oh, and before all that an oil change.