Srinivasak

I have a Lexus RX 300 2003 AWD. For the last 3 years I have the engine check light which comes on and off. Typically the light used to turn off in winter months and return in summer months.

However, this year the light just stayed all through. This is time for my inspection I would need to get this fixed.

I took it to Autozone and the code was P0135 (o2 sensor bank1 sensor1) need to be replaced. I replaced it with Bosch sensor but I still have the engine check light on. Autozone guys erased code but it jsut came back right away.

I removed EFI and battery cable. The issue still persists.

Any help is greatly appreciated, thank you very much.

hypervish

Bosch is not a good brand for anything in any Japanese vehicles except for maybe wiper blades. LoL. Bosch doesn't play nice with the ECU.

Get a Denso A/F sensor, and it should fix it.

Srinivasak

Thank you very much.

Can you please look into it and tell me if this is the correct part bank 1 sensor 1.

http://www.amazon.com/Denso-234-9009...ar=1&carId=001

carguy07

Yes, that is the one you want.

Lexmex

This is one of those areas where I say stick to the original Denso sensors (MAF sensor, ignition coils). These sensors can get really finicky. I got the best price on Amazon, too.

Srinivasak

Thank you gentleman I ordered the part from Amazon. I will change it tomorrow and keep you all updated.

Srinivasak

Gentleman,

I changed the sensor from Bosch to Denso. After that took the EFI fuse and put it back.

However, I still see the light on. Is there something else I should be doing?.

Any other tips?

hypervish

Have you scanned to check the code?

Srinivasak

Yes it is p0135

Srinivasak

Hi I took the pciture of the sensor I changed?. Can you click on the below link and tell me if I changed the correct one? ( I am thinking below sensor is bank1 sensor 1.)

https://picasaweb.google.com/4srini/O2SensorBank1#

Lexmex

Sorry to burst your bubble, but that is actually bank 2, sensor 1.

Bank 1, sensor 1 is behind the engine as shown below.

Lexmex

See this thread by 81corolla,

https://www.clublexus.com/forums/rx-...el-sensor.html

Take a look at the entire thread as a lot of us add pictures of us doing this process over the years.

jagalchi88

Hello!
My CEL and VSC both came on couple of days ago and my inspection is in August.
I changed both of my sensors 2 years ago for $500 (the mechanic said I need to change 2 sensors, which I'm guessing the one in the front and the rear.)
But after reading this post I realized that he might have ripped me off!
So this time, I'm going to try to do it myself, and I looked at the amazon link you provided.
Is that the only one I need to get and change?
And over and over I say this, but this forum is so helpful in so many ways!!
Thank you so much for helping us out!

Lexmex

Those two are the A/F Sensors, there are only two of them.

The only other thing is an O2 sensor, that's underneath the vehicle after the catalytic converter (it's cheaper than an A/F sensor), see my DIY, https://www.clublexus.com/forums/rx-...sor-2-diy.html

Make sure you get the code scanned first, don't assume it's the A/F Sensor or anything else.

jagalchi88

I just looked through and now I understand.
I will try to get the code scanned asap so I know exactly which one I need to change.
I will come back to ask you more questions if I get stuck.
Thank you so much!