Ron T.

Does anyone know exactly what engine code P0136 means? I have a 2001 ES 300 and got that diagnostic code on my code reader. I believe it is an oxygen sensor, but I'm getting conflicting information as to which one it is. Any and all help would be appreciated. Thanks in advance!

Hi Everyone, I finally got around to changing that sensor. I bought a Denso from Amazon also. It was $123.00 and free shipping. Only one arm fits in the space so disconnecting the connector is a bit of a trick with one hand but not impossible. The 7/8 box wrench did the trick. A few pulls and it came free. After installing the new one I ran the engine for about 20 min. The engine light remained on until I shut it off and re-started it a short time later. The engine light is now off. Job done! Thanks all for your help! Happy New Year! Ron

There aren't any oil leaks. The bottom of the engine is dry and the driveway where it is parked does not have any oil stains at all. The oil is being consumed through the engine. Again, the oil and filter were changed every three thousand miles. More than the interval recommended by the manufacturer. I am looking for someone who has had a similar problem and has gotten satisfaction from Lexus.

Thanks for the input. However I believe my problem is due to premature engine wear due to the sludging problem that Lexus made public a few years back. Has anyone had to deal with a similar problem? And, if so did they get any satisfaction from Lexus? This oil consumption started to appear at about 40K. This should not happen to a well maintained engine.

My 2001 ES300 has less than 50,000 miles on it. I am the original owner and changed the oil myself religiously every 3,000 miles. About three years ago I began to notice that it would consume oil after long trips at sustained higher speeds. The problem has gotten worse. This past summer, after a round trip of about 550 miles, I went through about 5 quarts. I also notice smoke from the exhaust at times. I understand that there was a problem with engine sludging and that Lexus might be responsible for repairs to the engine. Does anyone have any experience with this? Thanks all!

Sounds like good advice. The engine light hasn't gone on since I fooled with the wires. Might just be a dirty or corroded connector as you suggest. I'll check it out and report back. Thanks!

Thanks so much! Sounds like good advice. The engine light hasn't gone on since I fooled with the wires. So it looks to me like you got it right! I'll clean the connector and report back! Thanks again!

I inspected the sensor the other day and moved the wires a bit, preparing myself for the task ahead. Strangely, after driving about 100 miles, the engine light hasn't come on again. I can only conclude that there is a loose or broken wire to the sensor. Any ideas or suggestions?

I inspected the sensor the other day and moved the wires a bit, preparing myself for the task ahead. Strangely, after driving about 100 miles, the engine light hasn't come on again. I can only conclude that there is a loose or broken wire to the sensor. Any thoughts?

Hey everyone, thanks for the feedback. I looked at the sensor tonight. It looks like it could be changed from above on the ES. Probably with one hand on the wrench though. I'll ohm it out over the weekend and see if I can get to the root of it! I'll report back!

Hey, I looked at the sensor tonight. Didn't get a chance to ohm it yet. But, it looks like it would have to be changed from above if it needed replacing. Can you tell me what size wrench it takes? I assume a box wrench is the only way to go. Does the wiring connector fit through the wrench end? If it turns out to be a fuse, can you tell me where it is located? Thanks again!

Thanks for the info. and the pdf. Sounds as if you're familiar with this problem. I'll check the resistance and report back.

Does anyone know where the air fuel ratio sensor , bank 1 sensor 1 is located. Some of the posts I've read say it's on the intake manifold others say it's on the exhaust manifold. I'm getting a P1135 code and might have to replace the sensor. Knowing on which manifold and exactly where would be a great help. Thanks in advance!

Does anyone know where the air fuel ratio sensor , bank 1 sensor 1 is located. Some of the posts I've read say it's on the intake manifold others say it's on the exhaust manifold. I'm getting a P1135 code and might have to replace the sensor. Knowing on which manifold and exactly where would be a great help. Thanks in advance!