LEXUS ES300 Engine Check AND TRAC OFF – OBDII

31 Aug 2014 | Author: | Comments Off on LEXUS ES300 Engine Check AND TRAC OFF – OBDII
Lexus ES300

Topic: LEXUS ES300 Engine Check AND TRAC OFF

phamanhdung

Junior Member

posted 01-21-2007 10:36 PM 1999 Lexus ES300, auto, V6-3liter, 100,000 miles.

The code that came on is P0141 (O2 sensor heater circuit malfunction, bank 1, sensor2)

First I replaced just the downstream O2 sensor (after the cat), reset the car OBD memory many, many times but the code kept on popping up after the car runs 20-30 miles and/or the 3rd time starting it up. 2nd, I cleaned the MAF sensor and changed the air filter (unrelated)but the code comes up again and again after many resettings. 3rd, I replaced the O2 sensor on bank 1 (firewall). same problem.

4th, I replaced the remaining O2 sensor (on the outside exhaust manifold. Please note all three sensors are bought from the dealer (I brought in the old parts and I got direct Toyota part # replacements. Finally, it dawned on me that each time not only I get the CHECK ENGINE red light, I also get TRAC OFF.

When CHECK ENGINE light is not lit, I can manually turn TRAC on or off, but again CHECK ENGINE and TRAC OFF always come on at the same time. I don’t know if traction control has anything to do with CHECK ENGINE lite and/or P0141 code.

And, before replacing O2 sensors, I have replaced all spark plugs with Toyota dealer’s ones. One more thing, I addition to the P0141 code, I also get (through the emmission readiness menu on the scanner), I’d get evaporative system and/or O2 sensor NOT ready(not checked on my scanner), depite having replaced all O2 sensors and repeatedly resetting the scanner/memory. I am somewhat frustrated and desperately open to suggestions/advice.

Oh, I did replaced the gas cap with a non-vented one. That didn’t help either. Thanks again for any suggestions.

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kozloski

Member posted 01-20-2007 07:23 PM

Circuit malfunction indicates there is a wiring problem, not something wrong with a sensor. The TRAC OFF is probably related. Maybe you’ve got some wires crossed or a bad ground that affects both.

What was the last thing done under the hood right when all this started? Maybe you unplugged or broke something when you changed plugs. It sounds like a maintenance failure to me.

[This message has been edited by kozloski (edited 01-20-2007).]

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phamanhdung

Junior Member posted 01-20-2007 08:43 PM

quote:

Originally posted by kozloski:

Circuit malfunction indicates there is a wiring problem, not something wrong with a sensor. The TRAC OFF is probably related. Maybe you’ve got some wires crossed or a bad ground that affects both.

What was the last thing done under the hood right when all this started? Maybe you unplugged or broke something when you changed plugs. It sounds like a maintenance failure to me.

[This message has been edited by kozloski (edited 01-20-2007).]

Thanks for your reply. Actually the ENGINE CHECK light and TRAC OFF came on about 4 months but I ignored it (dumb on my part) until about 2 weeks ago, the transmission would not shift to overdrive on the freeway I noticed it because of the whining noise and the rpm showing 3500+ (when normally it is about 2200 at 60 mph.

I took it to a shop where they read the codes with multiple cylinder misfiring, but they said that it have nothing to do with the transmission/torque converter and suggested I replaced the transmission. I talked to a mechanic friend who told me that I probably have the wrong or old transmission fluid in the transmission. I replaced the transmission fluid, filter, and spark plugs at the same time. Still, the car would not shift to overdrive until about a hundred miles later.

Just before this happened, I just learned about OBD II scanner. the fact that it’s universal for 1996+ vehicles. and went out bought one. Anyway, about a hundred miles later, I plugged it in, and read the codes (P0141, and Multiple cyl misfires–the same old codes still in the computer that the car repair shop told me about) Note: at this point only new plugs and transmission fluid/filter have been replace. Then, after reading the instructions, I resetted all the codes.

Lo and behold (or maybe just mere coincidence), when I got on the freeway the transmission Did shift to overdrive once again. I don’t know if this has anything to doing with replacing the plugs or changing the tranny fluid/filter and/or resetting the scanner. Regardless, I was happy to overdrive working.

After calling the the dealer and reading related forum articles on the web, I found that that P0141 (bank 1, sensor 2 is the #2 sensor on cyl 1 side (for me the firewall), and since the car has only O2 sensors on bank 1, #2 is the one after the cat. So, with this revelation, I replaced the downstream (new term that I learned) O2 sensor. Still, same code came up after repeated resetting.

I figured, with the car just cracked 100,000 miles, replacing the firewall exhaust manifold O2 sensor would hurt that much. So I replaced that sensor (bank 1, sensor 1), cleaned the MAF sensor, replaced the air filter. the same routine. same problem. Then, I replaced the last O2 sensor on the outside exhaust.

Still no help.

So, CHECK ENGINE and TRAC OFF came on BEFORE I did anything. And I didn’t remember unplugging or breaking some while replacing plugs/transmission fluid filter, and O2 sensors. for everything had idiot-proof harness disconnects.

Also, I did check all the fuses and relays.

Again, thanks for your reply

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Lexus ES300

kozloski

The code still indicates a circuit fault and not a sensor fault. You still need to get a multimeter and a circuit diagram for your car and check it out.

[This message has been edited by kozloski (edited 01-20-2007).]

Junior Member posted 01-20-2007 10:12 PM

quote:

Originally posted by kozloski:

The code still indicates a circuit fault and not a sensor fault. You still need to get a multimeter and a circuit diagram for your car and check it out.

[This message has been edited by kozloski (edited 01-20-2007).]

I am not too savvy with a multimeter and circuit diagram. I was hoping someone who had a similar CHECK ENGINE and TRAC OFF problem to give me some insight.

Thanks, though.

update: I still need help. The car seems to run fine. I still don’t know why both ENGINE CHECK AND TRAC OFF have to come on at the same time.

Repeated reading and resetting, I still get P0141 (Heated sensor Circuit Malfunction) and EVAP SYSTEM not ready (through the emission readiness menu).

In summary, within a week I’ve replaced all O2 sensors, cleaned the MAF sensor, replaced air filter, replaced tranny fluid and filter, spark plugs– all with dealer parts, replaced with a non-vented gas cap.

I would have let the repair shop try to handle this problem if they offer me a reasonable diagnosis. The first thing the suggested was replacing the transmission. I had my doubts. Again, through talking to someone else, I put in new transmission (special Quaker state import type) and new filter. Now the transmission shifts to overdrive and the car seems to run fine except for the annoying (now moreever) CHK ENG and TRAC OFF lites.

I kind a want to get handle on (and not ignored it for about 4 months) to avert something big from brewing.

Lexus ES300
Lexus ES300
Lexus ES300
Lexus ES300
Lexus ES300
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