P0135 Mitsubishi Code - HO2S11 Heater Performance

have tried to reset code but comes back on have not replaced any parts yet

Start by checking the fuses. If the fuses are OK you may have to replaced the sensor

Does anyone know where the fuse for the O2 sensor heater would be? I checked this diagram and don't see any fuse labeled as such: http://www.justanswer.com/m...

What model and year is your Mitsubishi?

It's an '02 Lancer ES.

For your model year the Heater part of the O2 sensor is controlled by the Powertrain Control Module (PCM), so if you are getting the P0135 code, the problem is more than likely the O2 sensor it self.

Thank you - I figured that would likely be the case, but I didn't want to go the more expensive route if a cheaper/easier fix was available.

That's the idea. I hope the sensor fix your problem.

I replaced the O2 sensor on my 04 Galant LS and the check engine light came back on after I started my car the second time. When I started my car the first time it went away, I didn't know that there were fuses for the sensor until I read this thread. Do those symptoms sound like a fuse issue and if so where would they be located on my car?

Not a fuse issue. If the problem was the fuse, then the light would have comes back on the first start. Check the wire harness and connectors.

The wire harness and connectors appear to be intact. I ordered the o2 sensor from amautoparts.com. do you have any other suggestions? Is there another way to clear the code other than disconnecting the positive end of the battery?

tengo un mitsubichi lancer 2004 los ababnicos no para le colocamos el scaner y marco error P0135n que significa esto?

I have a 2004 lancer Mitsubichi ababnicos not to put him under the scanner and P0135n mistake that means?

El codigo es para el sensor de oxígeno y no tiene que ver nada con los abanicos que el motor se esta sobre calentando

un lancer 04 que le dio codigo p0135 que efectos tiene y que posibles causas en el senson de oxigeno puede haber disparado ese codigo

Simplemente el sensor dejor de funcionar, pasa muy seguido con los sensores de oxygeno. El efecto del sensor en el funcionamiento del motor es muy minima, talvez puede que gaste un poco mas gas, solamente.

Resurrecting this article!. Lancer 2005 ES with a P0135 code. Where can I find the fueses for the OS sensor heater?

found it (I think) . engine compartment fuse box, fuse 8. But it shared with a lot of other circuits, I wonder if is in fact the O2 sensor what is broken since is the only error I am getting.

Hello
If the fuse is OK, then the problem is more than likely the O2 sensor. According to a national database of repairs for your model year, the sensor is by far the most common problem that will set the P0135 code.

Thanks. The most interesting thing happened. I went ahead and removed the fuse to check it out, it look good so I place it back into its place, and voila! the check engine light went off.
I drove for about 15 minutes or so and it did not light up again. I'll check tomorrow, but I wonder what could have happened. The fuse was not out of its place for longer than a minute for the codes to be reset.
Any thoughts?

Was the engine cold when you tested? the heater part of the O2 sensor only works and tested by the ECM when the engine is cold. If the engine was already warm up, then the heater part is not tested by the ECM.
There is also a chance that the fuse was not making good contact.

The check engine light has been on for weeks already, regardless if I just switched the ignition on, or if the car was running for more than half an hour.
I had to drive the car ~3 miles to get the Pcode, so it was not cold, but was not really hot when tested for Pcodes.
When I removed the fuse and place it back, the car was parked for about 2 hours.. and just right after that the engine light never came back on. I just started the car this morning and it still not on. I will drive around today, actually I will take it for emissions testing and see how that goes.

light came back on while I was driving today. ok, O2 sensor will be replaced. What is the grease/stuff I am supposed to put on the new sensor's thread before bolting it back in place?

The grease is just anti seizing grease, most new O2 sensors come with a pack of grease or with grease already on the sensor threads.

Thanks!, I replaced the sensor and after resetting the computer (and driving ~100 miles) no more "check engine light".

Great!! Thanks for sharing!!!

Have a '04 ES Lancer with a P0135 code (bank 1, sensor 1). Cleared code, but check engine light came back after a few drives. If disconnecting the sensor itself and starting the engine the check engine light comes back on the next start which made me think it's the sensor. Checked all fuses (under dash and under hood) which made check engine light go away for now, but all fuses were confirmed good. Measured the ohm of the o2 sensor (two black wires) and had a reading (for those curious 0.L which stands for "out of limit" would confirm it's a bad sensor), and finally checked the voltage of the wire harness and got a voltage ~13.8V. Also with an obd reader connected with engine running, checked the voltage vary when reeving the engine. So, everything says it's fine yet my obd says P0135 so is my sensor really the issue?

Measure the resistance between heated oxygen sensor connector terminal No. 1 (red clip) and terminal No. 3 (blue clip). Standard value: 4.5 - 8.0 ohms [at 20°C (68°F)]
If the measured resistance is not between 4.5 and 8.0 ohms [at 20°C (68°F)], then replace the sensor.