1992 Lexus LS 400 failed nox emmissions

1992 LEXUS LS 400
141,000 MILES • V8 • 2WD • AUTOMATIC
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FLD 120
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i drove to echeck it was very hot 90 degres and very humid.on the way , this never happened to me before, i hit the throtle and it hasited and after that it drove normally.they hooked the car up it passed the first two tests but the third test which was nox it failed. what could the problem be?
Jul 20, 2008 at 2:29 PM
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