HELP!! still getting CEL

[grsd03]

I was getting the p0135 error, I replaced the o2 Sensor bank1 sensor1 with a brand new NGK. During the time I was replacing the sensor I had the battery disconnected. The install went smooth, started the car the cel was off (disconnecting the battery proably cleared it). A day later the CEL comes on again, so I cleared it by disconnecting the battery. A day later it came on again!!!

I'm not sure if the PCM needs to be cleared by the dealership or will disconnecting the battery work?

Also could it be a defective sensor ? Hope not since I can't return it. lol

Thanks in advance for the help

[DatSRBoi]

Your one of the many who will continue to suffer with it. Some people got lucky but many of us with intake and cat back exhaust gets them and continues to get them. Ive tried changing them out and I still get them.


But I wonder why your getting them when i see in your signature that your cars stock. I wonder if this can be because of rims and tires not close to stock size.

[Jon11582]

I think it need to actually be cleared via the OBD2 or it stays resident. I'm not sure about this. Autozone should be able to read the code and clear it for u free of charge.

and Px135 is a O2 sensor failure. It shouldnt have anything to do with the intake/catback. I think your under the false impression that everyone with a catback has this CEL problem. O2 sensors failing are NOT uncommon problem. In fact, this site manages to stay in business selling ONLY O2 sensors. Mine failed at 62K with stock exhaust.

I had P1135, which indicates a failure of the heating element in the A/F (Cali-emissions version of O2) sensor for Cali emmissions cars. I fixed by replacing my O2 sensor and clearing my code via OBD2 about 2 weeks back.

Could it be possible that you didnt get the right O2 sensor? NGK doesnt make our stock ones, Denso does, so maybe the cross reference might have been wrong. Theres a diff O2 sensor for cali emissions, non cali, I4 and V6, pre cat and post cat. All together theres about 7 different O2 sensors available for our platform. I hear even alot of experienced mechanics mess these up because thier all the same size, and some even go in the same place.

I dont know the reference page for NGK parts, but for Denso, its here.

http://www.densoaftermarket.com/catalog ... del=SOLARA

[DatSRBoi]

Well Im not like blaming it on the cat back. My take on this is that our Toyota ECU doesnt allow big changes in the cars power. Its designed to stay at a set amount. But when we upped the power of the car usually the implest and easiest mode the cat back and intake, the cars ECU doesnt allow the huge amount of changes and Hp to increase so it tries to put the car back on that setting and causes malfunction in the 02 sensors or somewhat. The thing about superchargers is that if you put the sc on stock intake and catback, it doesnt change much of the setting. But incressed flow causes the ECU to go bad...

Thats just how Im seeing it.. What ever thats causeing this issue, I do hope someone really finds a way to fix it. because ive tried changing it and cleaning it and clearing it with the OBD2 reader. Even just turning off the CEL light... It still sits there.

[StockSolara]

From my experiance if you disconnect the battery everytime the CEL comes on it will always come on and if you clear it with the OBD-2 Scanner that you can borrow for free from Autozone it won't come back on unless it's a different one

[DatSRBoi]

From my experiance if you disconnect the battery everytime the CEL comes on it will always come on and if you clear it with the OBD-2 Scanner that you can borrow for free from Autozone it won't come back on unless it's a different one

I found the truth on that.. Autozone guys actually turns off the CEL light rather actually solving the problem. So the code will be there, just not the light.

[Vampire]

...

[Vampire]

I agreee with Jon11582. First thing you need to do is make absolutely sure you put the correct type of O2 sensor on. Denso is the OEM maker. There have been countless times where the code keeps coming back because the wrong sensor is put on. I know it's costlier but I always use OEM. At least they know what sensor is what (at least I hope your local deaslership does) and can always be blamed if the sensor is incorrect.
If you want to test if the sensor is the problem, switch them and see what code comes out. If the bank changes you know the O2 sensor is the wrong one.
In regards to clearing codes. Disconnecting the battery (among other ways) for at least 15 minutes will clear all codes, current and stored. If the code keeps coming back then the ECU is still detecting a problem with either the sensor data it is getting or the sensor itself is faulty. You can clear codes with an OBDII scanner but if the fault is still there then you will still throw out codes. Unfortunately, the codes can sometimes change as certain problems can give multiple codes.

[Jon11582]

From my experiance if you disconnect the battery everytime the CEL comes on it will always come on and if you clear it with the OBD-2 Scanner that you can borrow for free from Autozone it won't come back on unless it's a different one

I found the truth on that.. Autozone guys actually turns off the CEL light rather actually solving the problem. So the code will be there, just not the light.

Yes that is absolutely true.

The code says: "Hey buddy you have a problem that needs to be addressed." It takes a snapshot at the time the CEL occured and stays in memory until it is cleared.

The car has no way of finding out if you fixed it or not. IF you replace the sensor and dont clear the code, the CEL will still stay on.

The correct procedure is to 1) scan the code. 2) Read the code, find out the problem, and possibly clear it temporarly to see if it comes back. 3) Fix the problem referenced by the code (by, in this case, replacing the O2 sensor). 4) Clear the Code through the OBD2 Scanner.

If you clear the code at step 2, it most likely will come back. It doesnt fix the problem, it only clears the code until the car figures it out again.

THe issue is if the Battery disconnect actually clears the code out of memory or the snapshot stays there to reappear soon after, and I cant speak to that, but Vampire seems relatively confident that it does. For myself, I would still get it cleared with a proper OBD2 scanner after fixing the problem just in case it actually doesnt clear it from memory.

[grsd03]

Hey guys thanks for the response, I figured out the problem, it was my stupidity, I was told by the dealer that bank 1 sensor was the the sensor by the rad, so thats the one that was replaced and thats why i kept getting the light.

So I changed the right one by the firewall which is Bank 1 Sensor 1 and now its been 2 days and no light!!.

Disconnecting the battery does clear all the codes, confirmed with dealer.

Thanks again guys!!

[Vampire]

Good job! What a relief huh. I don't know why but sometimes there seems to be a confusion by people who should know (dealers, parts sellers) that which bank is which.

[Turbosolara]

hmm, i thought p0135 is for bank2 sensor, which is around your catalystic convertor.

[Jon11582]

hmm, i thought p0135 is for bank2 sensor, which is around your catalystic convertor.

px135 is the problem code for the heating circuit for pre-cat Bank 1 Sensor 1 O2 sensor, which is in the rear of the engine (by the firewall) for 1MZs, or the one exhaust manifold in front of the engine for the 5S. 5S doesnt have a second Pre-cat O2 sensor, and the other pre-cat sensor in the 1MZ is in the front. A malfunction in the heating circuit is typically fixed by replacing the sensor and its wire. Part is usually around 250 from the dealer, or about 100 for a Denso OEM replacement if your resourceful enough to cross-reference the Toyota and Denso part numbers, and able to find the part.

P0135 is a heating circuit malfunction in B1S1 O2 sensor.
P1135 is a heating circuit malfunction in B1S1 A/F sensor (A/F sensor a type of O2 sensor that is found only on Cali emissions 5S and 1MZs, and looks just like the O2 sensor and goes in the same place but has a different part number. Even though they look physically the same, the harness is wired differently and perform slightly different functions, so they cannot be interchanged)

I have no idea about O2 sensors on the 2AZ or 3MZ.

1MZ and 5S have one post cat O2 sensor as well. Not sure of the codes for the other sensors.