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I was struggling with borderline NOX on my 300TE here in AZ too...
Failed twice, got it third time...just about...
I plugged the EZL so there was no vacuum advance, then put 4 bottles of ISOheet and gave it a run on the freeway at high RPM's to make sure the cat was RED hot. I checked video cam's at the center to make sure I could drive right in.
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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k
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