LEXUS GX470 2006 CODE P0420 & FUEL PRESS VACUUM LINE

[TOYOMAN]

Hi, to all my fellows GX's gurus...
I'm dealing with a fuel system issue, according to the scanner, code P0420, few times after an overheat (fixed already), the GX is running in fuel-rich condition
S.T Fuel Trim B1 0.0%
L.T Fuel Trim B1 -14%
S.T Fuel Trim B2 0.0%
L.T Fuel Trim B2 -14%
I did all the checks by the book, everything is OK, but found the vacuum hose connected to the Fuel Pressure Regulator, coming out of the Air-Intake Duct, does not have vacuum at all.
Does anyone did check that vacuum line?
Any clue that you can give me?

Thanks

 

[Brake Weight]

P0420 is for the post cat sensor. Either cat is bad/failing or sensor is bad/failing. As for the vacuum hose, not all hoses have vacuum at all times. It's a weird concept to grasp but that is how it is. Route your hoses exactly how they are on the diagram and it'll work as intended. Really confused me after I did a head job on my Tacoma and was putting it all back together.

 

[TOYOMAN]

Thanks, Mr. Brake, I did all by the Book, everything is OK, both post sensors are OK, both Cat are good, no leaks, no nothing; but still have the L.T Fuel Trim -14%. Thas why I think the no vacuum, at the fuel pressure regulator is weird, and possible cause.
I'm in Panama City, Panama, sea level, and the weather is like a Florida summer weather all year long.
My other Yota RAV4 2014 has almost the same numbers, S.T.F.T 0% L.T.F.T -8%.
May be is normal, and I'm the wrong one LOL...