Twinturboz

17 hours ago, Mihanicos said:

Remove the valve covers and spark plugs of each v side and turn the engine by hand from the crankshaft pulley.  Inspect the moving parts for correct operation and any damage, timing chains, their tensioner and that all pistons move. 

In uk you should be able to get anything new or used. 

Megazip and Jp spare parts, both in Japan, specialise in OEM Lexus spare parts.

Chris.

Will give this a go thanks. I guess the crux of the issue will be to determine if the issue was related to the valve recall or not. Lexus want to book the car in for the recall work but at this stage I'm pretty sure it's past that. 

Attached video below:

So I know this is an old post but I’ve just experienced something very similar to the original poster. Unfortunately for me I only bought the car second hand 7 months ago, but the sound in the video above sounds very similar. Car throws up error code P0335 and runs rough.  
 

I wasn’t aware of the recall, but checking the Lexus recall checker shows this car does have an eligible recall. Will contact Lexus and see where that leads but if as above the quote is 2k just to diagnose then it may not be worth it.