JRLJR

Hello all,
I'm new here and need help locating the o2 sensor on my gs300.
Code is po155 ho2s heater circuit malfunction bank 2 sensor 1.
I tried searching the forum, but didn't find an answer.
Thanks,
John.

link13

Hi. The 98 is a second gen GS, so you'll see more response in that forum. I think the mods will move this, so there's no need to repost it there. The complete troublecodes are listed here at the bottom of the page (for OBDII):

http://www.troublecodes.net/Lexus/

but, I see you've already found the meaning of the code. There are some techs in the 2GS forum who I'm sure can help you out.

JRLJR

Thanks for the reply and info Link13,
I wasn't aware that it is second gen.
I'm kinda new at the Lexus thing. My buddy lent me his code reader, that's how I found out that it has a bad sensor. I'm just not sure about the bank 2 sensor 1 thing. How many 02 sensors does thins thing have?

link13

From what I've read, you have 2 sensors; 1 pre-cat and 1 post-cat. You can find more info by searching the GS-Second Generation forum for oxygen sensors and O2 sensors. Here's a thread I found where a guy did a pretty detailed write up of a DYI O2 sensor replacement:

https://www.clublexus.com/forums/sho...=oxygen+sensor

JRLJR

Thanks again Link13,
I read that thread and another in the second gen forum.
If I get it right, bank 2 sensor 1 would be the rear exhaust manifiold, pre cat sensor. So I'll try that one and see what happens.