P0135 Error Code - Sensor Heat Circuit Malfunction....

[MCMike37]

Just some info I thought I should post here from an old experience.

Alright, so driving home from work today, car throughs a SES light. Get home, break out the good ole ODB-II scanner and it reads this code.

Read through the diagnosis in the service manual.

MY real question is, what the heck is this thing? The smanual says Right bank heated oxygen sensor (front) Heater ciruit.

Is this really just a heater for the O2 sensor? Or do they mean this is the actual) )2 sensor and it is heated? I hvaen't reset the code and gone through a test cycle yet to see if it comes back up, but looking for some preliminary info here.

And for what it is worth, the only thing I have done to my engine performance wise is just a AEM CAI still.

Thanks in advance thou people who know way more then I will ever know about engines....

Originally Posted by Sam

Ok, Tony and I were talking about this. You need to see if a wire has somehow come into contact with something to fry the covering, and destroy the wiring. If not, you may need to replace the whole O2 sensor. But again, check the entire wiring system so you don't fry another one if thats what the case is.

Originally Posted by MCMike37

Alright cool.

I mean, I am a little confused, because a P0130 is an O2 Sensor Circuit Maltifunction, although for both codes, it pretty much shows the same wiring diagram, just the 130 actually shows the connections to the ECM.

Well, took a look, and all the wiring seems to be perfectly in tact. I guess the next thing I should check is to see if the relay just shit the bed. I would think that if the thing didn't get power, it would throw the code as well as the ECM wouldn't see the thing there. Does that make sense?

Originally Posted by Matt

Mike I had the same issue on my car after my headers went on. The issue was that the front sensor clip had pulled apart from the clip leading to the ECU in the cabin. You may check there as well if you havent already.

If all your connections are good, I would agree with Sam that you prolly have a dead O2 sensor on your hands.

Originally Posted by madmax7776

My car's also thrown the same code before. THe difference is that I actually messed with the O2 sensor wiring and left one of the wires loose after installing my headers.

Before spending money on a new O2 sensor, just reset the code and see what happens. Sometimes, it could just be a misreading by the ECU and the code will never pop up again. I've had several different codes come up and after finding out what they were, I'd just reset them and never came back. At least, this won't cost you a penny, but if it happens again, then u know what to do.

Originally Posted by MCMike37

WEll, I totally forgot about this thread, but here's the final scoop on it.

I took it to the dealership because I thought the Cali emissions stuff was covered until 50K miles. Turns out, that is only the case if the 2000 model was registered in Cali, Massachusetts, and one other state. So, no free new sensor from them. But they did diagnose it for me to ensure it wasn't a bad wire or conection. I did in fact need a new O2 sensor.

So, I went to www.oxygensensors.com and ordered a universal one. (Almost oredered the wrong one too). Got it a few days later, and then got around to pulling out the old one and soldering the new one to the stock connector. The difference in O2 sensors is the universal ones you have to solder, while the stock replacement ones have the plug already on it. If you can solder, or simpley crimp, you can save roughly 60 dolalrs by getting the universal.

I've had it on for a while now, and the code has not come back at all. Problem has been solved for 50 bucks.

This all happened about a year ago, and I have yet to have a problem since then with the replacement O2 Sensor I purchased.

[TheFranchise]

just a FYI i was told that the difference between the universals from oxygensensors.com and OEM ones are that the OEM ones are platinum tipped to last 100k while the cheaper generics arent.

[MCMike37]

Well, that might be the case. I don't know the exact numbers, but I would say I have put about 20K miles on the generic sensor in the last year.

The other thing is that the sensor didn't fail, it was only the heating circuit which died. Or at elast that is the only code that was thrown.

[TheFranchise]

Originally Posted by MCMike37

Well, that might be the case. I don't know the exact numbers, but I would say I have put about 20K miles on the generic sensor in the last year.

The other thing is that the sensor didn't fail, it was only the heating circuit which died. Or at elast that is the only code that was thrown.

i bent over last year and replaced all 4 on mine after i had issues with mine. i crushed both my rear 02s and then fouled up front O2 because i ran without rears for 5k miles.

[MattS00]

A while ago I was looking for replacement sensors, and it seems that the upstream and downstream sensors are different. I found that the Bosch universal sensors, were only recomended for the down stream o2 sensors. WTF?

[BizGuy101]

The error code is for a malfunction in the heater circuit for o2 sensor 1 in bank 1. My question is which sensor is this? Is it the sensor right up front where the exhaust manifold is? Also, does anyone know where to get an OEM replacement besides the dealer and how much? Thanks guys for your help.

[Crewin323]

I think sensor 1 bank 1 is the forward bank, before the pre-cat.


...but I could be wrong

[LKNANML]

This should help you out a ton.. Take the time and DL the whole thing or order the CD...
Whenever im under my hood the manual is on the laptop right next to me......

Online 3G Service Manual

[BizGuy101]

Thanks a bunch

[SHORTY]

Originally Posted by Crewin323

I think sensor 1 bank 1 is the forward bank, before the pre-cat.


...but I could be wrong

Nope, it's the sensor on the firewall side before the pre-cat.

[Crewin323]

Originally Posted by SHORTY

Nope, it's the sensor on the firewall side before the pre-cat.

ok so aft bank, before the precat

[SHORTY]

On Cali spec:

Bank 1 is the side where manifold is near firewall
Bank 2 is the manifold at the front of the car near bumper

Sensor 1 is before Cat
Sensor 2 is after Cat

Ex. Bank 2 Sensor 1 would be the sensor that's placed in the manifold closest to the bumper and before the Pre-Cat.

It's common for people to think that the Bank towards the bumper is Bank 1. I know I did at first

[BizGuy101]

Do you happen to have a part number because when I went to the dealer he said the computer wouldn't tell him which sensor is which. All he had was part numbers. The o2 sensor is bank1 sensor 1. Please help....

Bank 1 sensor 1 is the front sensor closest to the radiator. I am getting the same code on my 2002 rs N/A gonna replace it this weekend.

[BizGuy101]

I'm getting 2 different answers here.....anybody have a part number?

[snake]

Originally Posted by BizGuy101

I'm getting 2 different answers here.....anybody have a part number?

Bank # is always in reference to cylinder number 1. On the V6, Cylinder #'s 1,3, and 5 are towards the firewall (Bank 1), and cylinder #'s 2,4, and 6 are towards the radiator (Bank 2). Sensor #1 is always the sensor closest to the head.

Sensor 1 Bank 1 (Before Pre-Cat on firewall side)
Sensor 2 Bank 1 (After Pre-Cat on firewall side)
Sensor 1 Bank 2 (Before Pre-Cat on radiator side)
Sensor 2 Bank 2 (After Pre-Cat on radiator side

(Credit goes to whomever posted that along time ago, I copy/pasted into a quick reference doc.)

[snake]

Originally Posted by BizGuy101

I'm getting 2 different answers here.....anybody have a part number?

Mitsubishi MD313304

[MattS00]

Originally Posted by snake

Bank # is always in reference to cylinder number 1. On the V6, Cylinder #'s 1,3, and 5 are towards the firewall (Bank 1), and cylinder #'s 2,4, and 6 are towards the radiator (Bank 2). Sensor #1 is always the sensor closest to the head.

Sensor 1 Bank 1 (Before Pre-Cat on firewall side)
Sensor 2 Bank 1 (After Pre-Cat on firewall side)
Sensor 1 Bank 2 (Before Pre-Cat on radiator side)
Sensor 2 Bank 2 (After Pre-Cat on radiator side

(Credit goes to whomever posted that along time ago, I copy/pasted into a quick reference doc.)

I posted that.

[RAVEN]

my car has been throwing this code since jan. '05. i kinda get the idea of what the problem is, but would be really greatful if someone could post pictures of both the v6 and i4 with arrows pointing to the sensors. i have a 01 rs cali spec. thanks in advance guys.

[bdidhe99]

Originally Posted by snake

Mitsubishi MD313304

So, are they all the same???

[kabob]

Yes.

[flyboytr]

Originally Posted by fasteclipse00

I posted that.

Thanks for clearing this up. I have been trying to find which back was which, etc, for two weeks. Now I only have to replace 1 O2 sensor...not four. Thanks again!

after reading this thread, i still have yet to connect the my installing an AEM WAI and my O2 sensor crapping out... can anyone clear this up? just got scanned and the code was P0135. I fully understand that the wiring or sensor crapped out, but have no idea why it would happen after installing the intake. and another note... it is throwing this code twice. no idea why...

[mitsuracergirl0]

you must not value my opinion

your opinion had nothing to do with why the code pops up after installing an intake. your opinion was that the code appeared because of the intake. i want to know why. i already know what it is.

[mitsuracergirl0]

i told you why...but i guess you didnt hear that either

[xmlenigma]

Can someone tell me whats the best place to buy this part from? Online / offline ? Prices?

Also, I have those PDF manuals downloaded. What should I be looking at to replace it? What tools do I need if any?

O'reily's or Autozone. If you buy the OEM one its $150. If you buy the noname one, it's $75.

The OEM one can be just screwed in where the old one was. The noname one has to be welded in.

[xmlenigma]

OEM is around 170 at AutoZone and Oriellys. Its close to 70/100 online. Any particular brand I should pick up?

[Phil]

https://www.automedicsupply.com/cata...eb4f93564d7d86 - that's where I bought my 4 new o2 sensors from. Came to $385 for all 4.

[3g_clips_rs]

I have an '02 RS (4 cyl). I'm throwing code 135 (in bank 1 sensor 1) like you guys did. If i ordered the Pre-cat OEM replacement o2 from Oxygensensors.com (part # 250-24633) would it work and where do i put it? Where is the o2 sensor that is fucking up? I'm pretty sure that this has been answered, but I read this entire post twice and it makes no sence to me, does all previous pertain to the V6?

[Bitter]

hey, anyone know what the Bosch part number is?

[MCMike37]

Not answering the recent questions really, but I am still running the same generic O2 sensor I purchased at www.oxygensensors.com. No problems almost three years later. All it required was snipping the old wiring harness, then using thee included hardware to splice the new sensor on and plug back in. I can't remember exactly, but I think the sensor itself ran like 60 bucks vice almost double that for one taht included the harness, and even more for one from the dealership.

[3g_clips_rs]

but where is the o2 sensor for the 4cyl that is bank 1 sensor 1?

[MCMike37]

I don't have them sitting in front of me right now, but they are explicitly labeled and described in the service manuals.

The digital version of the manuals is online here somewhere if you search for it and you can figure the location out from them.

[MattS00]

Originally Posted by 3g_clips_rs

but where is the o2 sensor for the 4cyl that is bank 1 sensor 1?

It would be the O2 sensor closest to the engine.

[xmlenigma]

I was told that if I unplug the battery for 10/20 minutes and then go for an inspection the sensor code and service engine would not show and I can get an inspection sticker easy.
Is that something I can do for a temporary solution to my inspection problem. ?

[citm2000]

Originally Posted by xmlenigma

I was told that if I unplug the battery for 10/20 minutes and then go for an inspection the sensor code and service engine would not show and I can get an inspection sticker easy.
Is that something I can do for a temporary solution to my inspection problem. ?

Maybe if you drive straight to the inspection center the light would be out. Otherwise, the second time you start your car with the failure condition present, the light will be right back on (or drive so many miles with it present). If all they do is look for the light, you might pass. If there is an actual emissions test, you're even LESS likely to pass, because your computer won't have finished re-learning yet. How about just fixing it?

[JT-Eclipse03]

Good info.. working on a similar problem now.. (with only 40k kms on the dial)..
Up here, if your ses lite is on..they wont even test you... then it gets worse/time consuming from then on....
I'd rather fix it now.. then have to deal with the BS from the Gov't later.

[THE_SilverBullet]

Just got code P0141 (sensor heater circuit malfunction, Bank 1, Sensor 2). Was reading this post and I know I probably need a new O2 sensor. I apologize because Im still not 100% sure which sensor I need for bank 1, sensor 2. I have a 2000 GT, sporty, fed spec. Whats funny, is I just got the code today AND it just turned 75,000 miles today. I know thats probably a coincidence.

Can someone look at this link and please let me know which sensor I need for bank 1, sensor 2, please? Really would appreciate the help!!!

2000 Mitsubishi Eclipse 3.0 V6-24V Oxygen Sensor - Auto Parts World

[Gustavo7]

o2 Bank 1 Sensor 1... is that front or rear?

[Gustavo7]

Mitsubishi MD313304

[Tx4Codeman]

Originally Posted by Gustavo7

o2 Bank 1 Sensor 1... is that front or rear?

rear before the precat

[hiimchad]

Originally Posted by SHORTY

Nope, it's the sensor on the firewall side before the pre-cat.

is this the same on cali-spec GS's?

[JT-Eclipse03]

...this is the info I received re: the similar issue...
.
. On Cali spec: - Re O2 sensors

Bank 1 is the side where manifold is near firewall
Bank 2 is the manifold at the front of the car near bumper

Sensor 1 is before Cat
Sensor 2 is after Cat

Ex. Bank 2 Sensor 1 would be the sensor that's placed in the manifold closest to the bumper and before the Pre-Cat.

It's common for people to think that the Bank towards the bumper is Bank 1. I know I did at first

.
-
Bank # is always in reference to cylinder number 1. On the V6, Cylinder #'s 1,3, and 5 are towards the firewall (Bank 1), and cylinder #'s 2,4, and 6 are towards the radiator (Bank 2). Sensor #1 is always the sensor closest to the head.

Sensor 1 Bank 1 (Before Pre-Cat on firewall side)!!
Sensor 2 Bank 1 (After Pre-Cat on firewall side)
Sensor 1 Bank 2 (Before Pre-Cat on radiator side)
Sensor 2 Bank 2 (After Pre-Cat on radiator side

(Credit goes to whomever posted that along time ago, I copy/pasted into a quick reference doc.)