daredeil95

Hi, It rained hard a couple days ago and I went through a deep puddle in the road and it set off my check engine light for evap & O2 sensor. The evap code went away but, the O2 sensor code keeps coming back, P0031-HO2S Bank 1 Sen 1 Heater Circuit Low, I researched the code and believe it to be the O2 prior to the cat behind the engine. I've been to Rockauto, Ebay & Amazon looking for a sensor. The problem is the listings are vague and I'm not sure I'm buying the correct part. I found this O2 on Lexus Parts: https://www.lexuspartsnow.com/parts/...omputer,,89465 but, I'm about 95% sure it's the correct part but, seems pricey? Anyone have a link for the right part but, not as pricey?? Thanks in advance.

code

Htony

Nothing on Youtube?

LeX2K

Go here
http://densoautoparts.com/find-my-part.aspx

daredeil95

Plenty but, not enough detail as to what I need? There are a bunch of O2 sensors for this car plus A/F that look like O2 sensors, a bit confusing to me. I understand post & pre cat O2's but it appears there are 4 of the O2 sensors and that's the confusing part to me and how to interpret which one i need. I guess I'll have to dive into it and learn the O2 system. I was hoping somebody did this and can point me in the right direction? I'll focus on this later on tonight......

A nice web site example.

daredeil95

Great website, thanks.

crwys

Not sure what year you have but you can check the part number for compatibility. On my 99 there is 2 before the cat and these are air fuel ratio sensors, 1 after the cat is an o2 sensor. See the link below.

https://www.clublexus.com/forums/es-1st-to-4th-gen-1990-2006/782089-oxygen-sensor-2.html#post9026095

Bank 1, sensor 1 is the 2nd link

daredeil95

Diagram

Denso
Update: After some google research here is the part location diagram & Denso P/N, hope this helps somebody in the future.

Lexmex

I buy my Densos on Amazon, cheapest price I can find.

crwys

You might want to include what year(s) this is for.