IS300 P0161 or P0141 o2 Heater Malfunction FREE Fix - Page 2 - Lexus IS Forum
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post #16 of 39 (permalink) Old 09-03-2009, 12:09 AM
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Someone Please post a fix for a 2001 PLEASE!!!!!

I have installed an O2 sim but still get a CEL of PO161. I thought the O2 sim would solve the problem but I still have a CEL for B2S2, soooo Annoying!!!!

Quote:
Originally Posted by F0RCEDInduction View Post
I have Megan Racing headers on my car and I had a CEL for B2S2, so I got myself an 02 Simulator and wired it in. Right away, the CEL went away but came back about 3 miles later, I cleared it and once again 3 miles later it came back on. I left all the sensors in the exhaust. Did I do something wrong?
I am having a similar issue. I have an 01 IS with PLP intake, OBX headers and downpipe, and HKS exhaust. I started to have the CEL after I replaced my headers and did some research and ended up buying the O2 sim from o2simulators.com. I had my mechanic install it and the part lighted up properly. I tooo started to drive off and with a few miles the CEL came back on.

I am not sure if for an 01 you have to solder in the 25watt 20ohm resistor as stated by

"ElitistK
300iss: If we ignore the heater circuit, then the CEL would still come on.
I wire a 25watt 20 ohm (or more ohms if you wish) to my heater circuits."

and where exactly does that solder into, inbetween the wires or somewhere else. I just need clarification if anyone can help please

Also if the above DOES NOT have to be done the only thing I can think of is switching the two WHITE wires from the O2 sim from one side to another. I really don't know if that makes a difference if anyone can clarify. Like I said the unit lights up every 2 seconds and flashes green and then goes out 2 seconds and repeats the cycle. I am 99% sure I installed it correctly but that is the only thing I can think of that I can change in my installation. I have researched this thread and many others and haven't seen a full clarification if it makes a difference from one white wire to another (basically switching B1S2 and B2S2 white wires on the O2 sim.

The only CEL that I receive is PO161 - "O2 Sensor Heater Circuit (Bank 2 Sensor 2)

Whats making me real upset is that I installed it almost a year ago and I thought after I tried the O2 sim and that didnt work I would just give up and deal with looking at my CEL everyday. But now I have to check and clear my CEL about once a month just to make sure that this is the only REAL cel code that the car is showing. Its been on my todo list for a while and I finally have some free time to take care of it with YOUR HELP.

I know that having this CEL on all the time is messing with my fuel economy and performance and just want to put this one to rest after all. I wish I was rich and didnt have to care about gas prices but please help a brother out!!!

I do truly appreciate this forum and all the members that give feedback for the betterment of myself and others alike. I have also included some pix of the O2sim light on and the error code. thanks again!!!
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post #17 of 39 (permalink) Old 05-14-2010, 09:33 PM
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Don't forget to clear the error codes using a OBDII code reader to turn the check engine light off and see if the problem persists.
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post #18 of 39 (permalink) Old 06-07-2010, 07:57 AM
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Quote:
Originally Posted by blakaraknyd View Post
Oooooh oooooh oooooooh, I got a quick fix... when you find those two wires (and, yes, this is serious) just cut up any extra wires you have in your garage (if you're like me and have extra wires everywhere) and just stuff it in each pin socket... it still transfers the same amount of energy (I honestly didn't think it would but it did). I did this the day before I got my smog check and i actually STILL have it in the way I described... don't cut your wires ,especially if it's gonna be temporary.
Now will doing this short anything ?
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post #19 of 39 (permalink) Old 08-31-2010, 09:39 AM
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I just tried this mod for a P0141 and I started my engine and I'm still getting a CEL. Do I need to drive around for it to go away?
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post #20 of 39 (permalink) Old 03-23-2011, 11:56 AM
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Hello from Germany =) I m proud owner of a Lexus IS 300 model 2002 and my main Forum is Lexus Owners Europe. I install the Megan header + Megan downpipe and O2 Simulator but i still have 2 errors (p0161 and p0141).
I tried to find some solutions on different forums but nobody can help me.
So this forum is my last chance. Can anybody show me a wiring plan of a 2002 IS300 for the heater signals? Or any idea how can I fix a the 2 errors?
I enjoy reading your posts and I m happy, that there a lot of helpful people on this Forum.

Thank you

David
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post #21 of 39 (permalink) Old 04-11-2011, 03:15 PM
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Does anyone have this picture still? Trying to do this to an IS 300 and know which wires to connect but not sure if I need to connect them on the ECU end of the other end if that makes any sense. Another way to explain it would be does the ECU receive the voltage or does it send it out to the heater and then to ground?
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post #22 of 39 (permalink) Old 05-03-2011, 11:50 AM
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Hello to all who still have this problem. You should have soldered or connected two resistors with 15 Ohm and at least capacity of 20W or better. The codes should not appear again.
I buy 2 of this Hochlast-Zementwiderstand 15 Ohm / 20W (LSR-150/20) bei Trenkenchu & Stadler GbR
You should be careful with the heat. The Resistors will be very hot. So place them under the car or in engine area. Sorry for my English - I hope to have helped you.











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post #23 of 39 (permalink) Old 06-04-2011, 08:57 PM
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Quote:
Originally Posted by eies300 View Post
Hello to all who still have this problem. You should have soldered or connected two resistors with 15 Ohm and at least capacity of 20W or better. The codes should not appear again.
I buy 2 of this Hochlast-Zementwiderstand 15 Ohm / 20W (LSR-150/20) bei Trenkenchu & Stadler GbR
You should be careful with the heat. The Resistors will be very hot. So place them under the car or in engine area. Sorry for my English - I hope to have helped you.











Hey, according to the diagram that you uploaded for the resistor.

This may be a noob question, but whatever.

There is something I don't understand. Do I have to tap the resistor between the two wires (heater signal and heater ground) forming an H?

Or do I have to cut both wires (signal and ground), and put the resistor between signal and heater, and then tape down the end of the other two wires hanging?

I'll just upload a picture and you guys let me know which one to use... I USED THE LEFT ONE and still got the codes again.

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post #24 of 39 (permalink) Old 07-26-2011, 03:57 PM
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Quote:
Originally Posted by longnights View Post
The same concept can be applied to the 2001, however, the harness is slightly different. You want to tap the b1s2 heater signal to the b2s2 heater signal. Use this diagram for which wires those are:

So I got my CEL and pulled the code for P0141, I'm still searching around gathering up info, but from what i know so far, is that it is the heater signal from the 02 sensor. Do I need to have the 02 simulator, or can i just tap a wire from one sensor to the sensor at the ecu for a quick fix, or did i misread/misinterpret this thread? and will this suffice to be able to pass smog, or will I have to buy the whole sensor and splice/solder?
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post #25 of 39 (permalink) Old 09-06-2011, 05:42 PM
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I know this is late and all but to answer SoCal, from what I heard the O2 Sim only simulates the signal, not the heater. At tokenssolutions, they sell an O2 plug n play where it simulates both signal and heater. I personally haven't tried it but really looking into.

And from reading the 1st page, if P0161 is on, tap B2S2 heater to B1S2 heater. I'm just going by what was said.
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post #26 of 39 (permalink) Old 01-05-2012, 07:30 PM
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P0141 code

I have a 01 IS300 with the above code, this thread seems to be a quick(temp) fix for the problem, but isnt replacing the 02 sensor should be the actual fix?
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post #27 of 39 (permalink) Old 01-06-2012, 10:31 PM Thread Starter
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yes, replacing the o2 sensor is the actual proper fix.

Have a question? Try the my.is FAQ or, if you can't find an answer there, search before posting your question (hopefully in the correct forum).

2002 IS300 5mt. MSM stock for now
Cobra Project:
FFR MKIII '65 Cobra Replicar - 427 cid V-8 (thats 7.0 liters) engine 525hp/520lb-ft torque at the flywheel (and this is in a 2200 pound car) Painted Lexus Spectra Blue Mica with GM Arctic White stripes -- now street legal
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post #28 of 39 (permalink) Old 01-06-2012, 11:23 PM
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sometimes I forget about this forum but it really is a true archive of info. Longnights has this forum taken care of. Add this O2 related diagram to the list

Http://img522.imageshack.us/img522/8813/o2diagram16.jpg

'02 IS300 MSM LSD
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post #29 of 39 (permalink) Old 01-15-2012, 01:38 AM
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where is the pic from the OP because im not sure i really understand what to do? i just got the p0141 code after i installed my header, and i have a o2 sim. is this just a coincidence or related to the header? and is the temp fix going to cause any problems in the long run?

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post #30 of 39 (permalink) Old 03-09-2012, 12:42 AM
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So I deft need that image for the 2002 is300. Jus replaced b1s2 with a Bosch from advanced auto and reset the ecu only to have the cel come back on. Same codes as before, p0141
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