67rivdog

iTrader: (1)

I recently had to get my LS400 smogged (CA) and it came back as a gross polluter.

The engine light also came on during the test, and had the codes for the rear oxygen sensors and a valve in the transmission.

I have replaced the oxygen sensors, PCV valve and I cleaned EGR Vacuum Modulator Filter (as shown by LexLS! Thank you!). I will be soon replacing the spark plugs, wires, caps and rotor's.

Is there anything else I might do, look into, in order for it to pass the next test?

Thank you for any input.

Frank

LiCelsior

iTrader: (32)

straight pipe exhaust should help pass...lol jk. what u mentioned should pass you easy.

jadu

iTrader: (42)

my dad always said to get the engine really hot before testing; i.e. drive for half an hour before testing

my SC was also noted as a "high emitter profile"

67rivdog

iTrader: (1)

@ LiCelsior, Lol - Could you imagine the look on the Smog tech's face? *Brap Brapt Brap* "Yeah I'd like to get my Lex tested." *Brapt Brapt* "What?" :P


@ jadu, Did you have to do any other maintenance than what I listed, and what you mentioned?

67rivdog

iTrader: (1)

Cool, it passed. I had to change the two front oxygen sensors before I had it retested. Codes kept popping up.

I am back on the road again. :P

RA40

iTrader: (6)

Those are the usual suspects to be changed when the car fails.

nthach

What brand of O2 sensors did you use?

67rivdog

iTrader: (1)

The two rear sensors were Denso and a direct fit, the two front sensors were universal Bosch. I needed to get the front's changed the same day, so I went with the universals.

After reading horror stories about Bosch I am kind of nervous, but time will tell. They were a piece of cake to change.