Did the citric acid/oxalic acid wash on my cats yesterday and got an emissions test today. Went from 2.06 NOX on my last test to 0.4384 on this one, and finally passed.
New-to-me LX470 failing CO emissions due to NOx (1 Viewer)
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Wow I didn't know that was a thing!
I'm so glad you solved the problem without buying new cats.
Took the LX to easy mountain trails this past weekend... They are worth the blood, sweat, and tears (and parts money)
I happened upon someone here on Mud mentioning it in one of the P0420/0430 threads regarding Subaru owners having success with it, so I went to googling and found various vehicle message boards with folks who've had success with it. The impetus of this method was a study done in Spain in 2006, which showed that citric and oxalic acids significantly improve the catalytic activity of an aged commercial three way catalyst.
That's awesome. We've been taking my wife's 4runner lately because the LX is in dire need of some front end work (bearings and CVs). I'm hoping to tackle it this weekend.
