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post #151 of 181 (permalink) Old 10-26-2013, 05:53 PM
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i'd really appreciate anyone who hears me out and gives me their 2 cents! :D

i have an 03' IS300 and last night after driving a full car to eat kbbq in garden grove, the CEL/trac off light came on. i know the trac off light comes on when the CEL does but i had my 90k car service and the only thing i think could have triggered it based on my driving behavior would be because i was going about 75mph on the freeway, then put it into NEUTRAL to cruise free out of gear to the freeway exit about a half a mile away...but then a car pulled behind me so i put it back into DRIVE* (i have an automatic gearbox) ... of course the RPMs went from about 800 to 2700...but would this possibly be what caused it? the CEL then came on only about 3 minutes later...i parked/drove it around a few times after, but the next day it turned off by itself before i got the chance to pull the code and it's killing me that i didn't read the code!

any ideas on what code it possibly was/why?

much appreciated.

*i assumed the computer would put it in the correct gear going from NEUTRAL to DRIVE so it wouldn't overrev...i mean the engine didn't blow (that i know of)...
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post #152 of 181 (permalink) Old 10-26-2013, 06:04 PM
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i'd really appreciate anyone who hears me out and gives me their 2 cents! :D

i have an 03' IS300 and last night after driving a full car to eat kbbq in garden grove, the CEL/trac off light came on. i know the trac off light comes on when the CEL does but i had my 90k car service and the only thing i think could have triggered it based on my driving behavior would be because i was going about 75mph on the freeway, then put it into NEUTRAL to cruise free out of gear to the freeway exit about a half a mile away...but then a car pulled behind me so i put it back into DRIVE* (i have an automatic gearbox) ... of course the RPMs went from about 800 to 2700...but would this possibly be what caused it? the CEL then came on only about 3 minutes later...i parked/drove it around a few times after, but the next day it turned off by itself before i got the chance to pull the code and it's killing me that i didn't read the code!

any ideas on what code it possibly was/why?

much appreciated.

*i assumed the computer would put it in the correct gear going from NEUTRAL to DRIVE so it wouldn't overrev...i mean the engine didn't blow (that i know of)...
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post #153 of 181 (permalink) Old 11-26-2013, 12:47 AM
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hey guys im new to the forum i have a issue with my is300 ECU i guess the guy that i got it from had flash the ECU in order to release more fuel dose anyone know how i can fix this problem or reset my ECU to original settings please help?
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post #154 of 181 (permalink) Old 11-26-2013, 11:07 AM
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Originally Posted by vaz300 View Post
hey guys im new to the forum i have a issue with my is300 ECU i guess the guy that i got it from had flash the ECU in order to release more fuel dose anyone know how i can fix this problem or reset my ECU to original settings please help?
Is it a stock IS300 ECU? Nobody has been able to crack the maps or injector duty cycles on the stock computer so I don't believe that's possible. To reset the ECU you take the negative off the battery for 5 full minutes.

'02 IS300 MSM LSD
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post #155 of 181 (permalink) Old 01-30-2014, 06:19 PM
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Let me verify that this is why I am getting these 2 codes. My B2S2 o2 was cross threaded and I bought a new y pipe and I removed the o2 sensor so don't mess up the bung hole. I am getting a P0057 and a Pending P0153? Is this normal removing the B2S2?

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post #156 of 181 (permalink) Old 01-30-2014, 06:39 PM
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Originally Posted by LexusSpeed01 View Post
Let me verify that this is why I am getting these 2 codes. My B2S2 o2 was cross threaded and I bought a new y pipe and I removed the o2 sensor so don't mess up the bung hole. I am getting a P0057 and a Pending P0153? Is this normal removing the B2S2?
P0153 is O2 sensor slow response B2S1 and P0057 is O2 sensor heater circuit slow response B2S2(which means the sensor is going bad). Do you have an exhaust leak that woukd give you an upstream code? Any heater code means either the wiring is messed up somewhere or more likely the sensor is simply going bad. That's fine that you can leave B2S2 off the manifold to avoid heated codes but without a sim or maybe tying into B1S2 you will get cat efficiency codes too. You should be able to get a tap to fix the cross threads if on the bung.

'02 IS300 MSM LSD
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post #157 of 181 (permalink) Old 03-03-2014, 07:17 PM
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Pcv valve hose???????????

2003 Lexus is300 - I cant find this PCV Valve hose anywhere online, I don't know if someone can help me here?
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post #158 of 181 (permalink) Old 03-21-2014, 02:41 PM
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Hi peeps.
Got an MY99 is200. My engine light is flash in and so is my traction control light.
Did a check and come back as p0300, p0303, p0306 and p0003 error codes.
Any help would be great full as new to having a lexus
Thanks guys
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post #159 of 181 (permalink) Old 04-03-2014, 09:46 PM
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Misfire codes , what's the condition of your plugs and wires ?
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post #160 of 181 (permalink) Old 06-03-2014, 10:17 AM
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I've got a weird one. I got codes p0155 and p0141. No other codes on my boosted is300. Any ideas what would throw JUST these 2 codes?
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post #161 of 181 (permalink) Old 06-23-2014, 01:08 AM
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CEL and Trac off lights on!

Ok, so I just traded my 76 GMC Sierra for a 2001 Lexus IS300 literally 3 days ago, the previous owner has done a few mods, K&N cold air intake, bigger injectors, aftermarket headers and exhaust, was told he bypassed the heated throttle body? but I'm not sure. That's all I know of, not familiar with Lexus but hopefully you guys can help me with that.

I apologize for the long post, I just want to give everyone the info that I already have. I'm having a problem with "Limp mode", It intermittently goes in and out, having about 20-30% of throttle when in limp mode. I have heard the K&N are famous for causing MAF problems so that's where I started, cleaned the MAF and K&N air filter, made sure the throttle body and air intake piping were all clean. And still have the problem. It usually happens when I'm accelerating from a stop quickly, or I take a corner sharp and slow down rapidly, and I could usually turn the car off, take the key out, and restart it, and it would drive ok for about 10 minutes until I did one of the things above. But today, I did a few things, I reset the computer by just taking off the negative and positive and connecting them together to flash the computer(suggested by a friend) and while cold, I started it up and took it for a drive, accelerating and slowing down rapidly and It ran great, went faster then I ever have before in this car, but when I turned around in a parking lot, it popped the CEL and Trac off lights on and went into "limp mode". Tried my trick(turning it off and restarting) and it didn't work. I took it home let both of us cool down and came back a few hours later, reset the computer again, popped the radiator cap and let it idle until it got to running temp, the whole time it was idling no lights were on, but I was watching very closely and I believe I watched the thermostat open up and start circulating coolant and watched air bubbles rise to the surface, and then it started idling rough, I went to rev the motor to see if I could bring up the RPM and It was in limp mode again, having only about 20-30% movement in the throttle body and pedal, note all this was in my driveway, never driven, just idled until the thermostat opened.

So that brings me to my question, what could be my problem? Head Gasket? TPS? MAF? Throttle Body? Simple tune-up? Please help!

Last edited by HarleyCannon; 06-23-2014 at 01:32 AM.
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post #162 of 181 (permalink) Old 06-23-2014, 04:50 AM
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I'm sorry, i really didn't get too far in your post, you said you were in limp mode and set the CEL. Let's start out there, what code(s) do you have? I would stop doing ECU resets until you have read them and then post them here. You can't really guess with the DBW stuff.

'02 IS300 MSM LSD
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post #163 of 181 (permalink) Old 07-09-2014, 03:00 PM
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Dtc c1500

I have an 01 IS300 that is showing a C1500 trouble code. I have searched the internet but have not come up with any info other than Transfer Case Contact Plate "B" Encoder Circuit Failure. If anyone could help it would be much appreciated. I am using the ELM327 Bluetooth code reader with the Torque app on my phone.

Last edited by Littrellii; 07-09-2014 at 03:11 PM.
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post #164 of 181 (permalink) Old 08-06-2014, 04:27 PM
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I have CEL codes p0420 and p0430 and I'm trying to pass inspection. I wanted to know if anyone can help me. Do I need a new cat converter?
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post #165 of 181 (permalink) Old 09-21-2014, 01:08 AM
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I have p0420 I had just found leak where y pipe meets exhaust fixed leak code came back
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