Wife was driving her Lexus 2010 when she got the following warnings and took a picture (see below). It was freezing outside so that may have had something to do with this.

Drove car in morning to appointment (5 miles) no problem. Let sit for 2 hours (freezing weather). Drove back and encountered the warning below: Check AWD System, check engine light and traction control light. Roads were fine with no snow/ice. I checked code on car and it called out Cylinder 5 misfire. She encountered loss of power going up hill.

I cleared code and checked/replace front bank of plugs (Cylinders 2, 4, 6) with Denso #3426 (FK20HR11) - too difficult to replace others. Spark plugs looked decent minus some oil/gas on threads of plugs similar to what I saw on another posting that went through process of changing plugs. Car drove fine after (next 20 miles). We'll observe from here but anyone encounter something similar have any ideas?



Lexus 2010 - RX350 : Check AWD System

 

Lol at least your situation is still better than what my RX is going through...

https://www.clublexus.com/forums/rx-...ml#post9308378

 

There's a good chance it was just the gas cap not being tightened properly. Got the same warnings on my 2015 Highlander and that was all it was.

 

The only way to find out the problem cause will be to hook the car up to a diagnostic scan tool that reads engine control modules to learn why the AWD system is malfunctioning.

The cause could be as simple as a bad sensor to as bad as the magnetic AWD component that engages the rear differential.

 

I'll redo gas cap as we had filled not long ago (a few days before issue). I did check with Actron Auto Scanner and it reported Cylinder 5 misfire and that was it. I cleared it. No other codes.