Under the hood on the driver side right in front of the cowl is a combined fuse and relay box. the relay section is on the back side on the fuse section. You will probably have to unbolt the brake fluid reservoir because it is right on top of the access cover to the relays. Remove the C/OPN relay.

 

HiDennis


located the box but could not find C/OPN relay there are 4 relays in that box BRK- FAN NO.2- A/F and EFI MAIN

 

I was following the service manual for my 2007. I know there are electrical wiring differences between the 330 and the 350 and this apparently is another one of them. Sorry.

I don't know if you want to try this, but on other cars I have unplugged the wires at the fuel tank.I have never done this on a Lexus so I don't know how easy/difficult this is.

 

Thank you will try and let you know . Appreciate you effort

 

FYI I posted photos on how to replace the spark plugs on a 2009 Lexus RX350 for a DIY at:

https://www.clublexus.com/forums/rx-...placement.html

I buy my parts from Amazon.com (Free shipping for Prime members) and here are my costs which does not include labor since i did the work myself....

6 Spark Plugs Genuine Toyota Denso FK20HR11 ($9.00 each) = $54.00 plus tax
3 Coils Genuine Toyota Denso 673-1309 for Rear only ($59.78 each) = $179.34 plus tax
PVC Valve = $9.56 plus tax
Intake Plenium Gasket = $14.70 plus tax
Throttle Body Gasket = $5.60 plus tax

This is roughly $300 for parts from Amazon. I estimate 4 hours labor so assuming $80 an hour, replacement should cost $620. You can save $180 if you reuse your coils for the rear but i do not recommend this. Please note that shops do not charge Amazon price but the retail price price which is higher so $700 to $800 sound right....if it include 3 new coils for the rear.

I reuse 3 coils with 130,000 miles for the front plugs since they are easily replaceable. This job is a lot of work for a DIY'er so I made sure the rear coils were new and not used.

 

Thanks for all the comments everyone! I ended up having a shop do it for around $800. The shop was very clean and professional looking, provided a loaner car, and had good internet reviews.