i checked the code "P0141 Heated Oxygen Sensor Circuit - Bank 1 Sensor 2." what is that? i think it's the o2 sensor, does anyone know which sensor it is? and part #? thanks

 

in terms of the exhaust system being the stream, you have 2 banks in the stream.

engine being the top of the stream, first bank has 2 or 3 sensors i believe, the second one going toward the back of the vehicle is the one. Odds are, this sensor has gone bad. Just search around, i believe this problem has been covered before, you should be able to get a part number.

 

http://cgi.ebay.com/ebaymotors/ws/eB...m=250299755089

is this what i need?

LEXUS GS300 (2001) 3.0L L6 FRONT; LOWER; AT CYL 1-3 2JZGE

 

no, you would need part no. (denso) 234-4048


this is the part number for the sensor in the pre-cat bank that handles cylinders 4-6.

here is how your sensors go, as i clarified it for myself just now:

Bank 1: before the cat. Sensor 1 handles cyl.1-3, Sensor 2 handles cyl.4-6

Bank 2: after the cat. Sensor 1 again handles 1-3, Sensor 2 handles 4-6.


if youd like, oxygensensors.com has the denso part for 120, which is a very reasonable price:

http://oxygensensors.com/catalog.php...3835#Location1

 

i found this online, he is saying bank 1 sensor 2 is the one after cat but still cyl. 123. i am confused =/ what exactly is bank 1 sensor 2?

(1,2,3 precat) Bank 1 Sensor 1: 234-4048

(1,2,3 postcat) Bank 1 Sensor 2: 234-4626

(4,5,6 precat) Bank 2 Sensor 1: 234-4630

(4,5,6 postcat) Bank 2 Sensor 2: 234-4603


https://www.clublexus.com/forums/sho...ighlight=p0141

 

no, you're right, that's my mistake. I'm thinking banks in terms of upstream and downstream, it's actually just as you diagrammed it, in terms of cylinder banks.

bank 1 is cyl 1-3 and bank 2 is cyl 4-6, sensor 1 is precat, sensor 2 is post cat. 234-4626 is the one you need.

my bad damn sleep deprevation

 

haha cool thanks man for all your help!

 

Swat, were you able to clear out the code by order denso 4626? I got the exact same problem. Thx.

 

I had to replace an o2 sensor TODAY on my 2002 Rav4 which only has 35k on the clock

$250 bucks including labor. O2 sensors are not covered under the Toyota/Lexus 8/80k emissions warranty..The dealer also reflashed the ECU as a result of a TSB to re-calibrate the air fuel mixture which was too rich.

 

I too have the same CEL code. I replaced the correct sensor, disconnected battery and the CEL came back on within a few miles. I have been driving it for a couple weeks with the CEL on and for some odd reason it went off last night, then back on today with same code. I have an appointment with Toyota to try and figure it out.

Any suggestions for me to try on my own?

Thanks!