Quick emissions question
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Driver School Candidate
Joined: Aug 2010
Posts: 41
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From: Ga
Quick emissions question
Car failed the hi nox area of emissions. Ive replaced the cts and pcv since. Just wondering if I should pull codes even though i'm NOT getting any cel's. Car is driving fine otherwise and idling under 1k. Noob question but i'm a bit unfamiliar with toyota. I thought cels usually came on after something went bad.
When a vehicle fails for high NOxs its most likely the EGR, EGR modulator, or the VSV that controls the EGR modulator. The Catalytic converter also can contribute to NOX failures but should be the last option.
Do some tests on the EGR components to see if they test out fine.
Do some tests on the EGR components to see if they test out fine.
You can also try a gallon or 2 of alcohol in the tank after you change the filter... high nox can ultimately mean bad cats, but i start with the easy fix first.
CO gives you one free retest for every paid test. Does GA do that?
CO gives you one free retest for every paid test. Does GA do that?
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How many miles are on the car? What year and is it a 2JZ or 1UZ?
Hows the numbers look on the HC's and CO? If the HC's and CO are high, your CAT is shot.
But like mentioned before, this should be the last option cause CATs are so expensive to replace
Hows the numbers look on the HC's and CO? If the HC's and CO are high, your CAT is shot.
But like mentioned before, this should be the last option cause CATs are so expensive to replace
I'll put money on it that its your EGR modulator or the EGR valve itself.
HC's and CO are really low so the CAT still good. I see this all the time when Toyota/Lexus FAIL NOXs.
HC's and CO are really low so the CAT still good. I see this all the time when Toyota/Lexus FAIL NOXs.
Last edited by 6SOARER; Apr 23, 2011 at 03:38 PM.