OK, I took the engine compartment trim out to investigate replacing the oil control valve on my 2014 RX350. After putting the plastic trim pieces back in, I noticed that I have a strange silicone rubber piece left over. Where the heck


does it go? See the pictures attached - it's approximately 2in X 4in
TIA - Chuck

 

It's a potentially useless piece that rests on the head just forward of the PCV Valve - see picture. Held in place by the silver plastic trim post.

 

Not useless.

It is the spacer/isolater for the fancy engine cover as you snap it on to the pin. If you remove it, the cover will most likely rattle and might melt as the engine block heats up.

Salim