Quote:
Originally Posted by spawnarc
okay I am feeling stupid because I posted before that I replaced the cat and that was my problem but I went this year for my test again and it is failing for the NOX again. I cleaned the egr and obviously I have a new cat so what could the problem be this is really aggravating?
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I had a problem with the VSV (Vacuum Switching Valve). The mechanic put one in and it passed. He mentioned to me that if this didn't work, the next step was to decarbonized the engine. And if that didn't work - replace the Cat. But in your case, it doesn't apply. You may also want to check your timing. This might be your problem. You may have to advance it a bit.
