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As Stormin Normin said, why don't you fix the underlying problem? Is this a car that you plan on keeping? Check the 700/900 FAQ in the Features pulldown menu above...there is a list of things that may be the problem for failed NOx, HC and CO. Typically vacuum leaks or a bad cat converter.
In lieu of that, you can retard the timing by a few degrees which will reduce your NOx. This can be done by turning the distributor and setting it once the timing (w/ timing light) is a few degrees less than whatever your spec is (you can find the spec on one of the metal plates in the engine compartment, typically on the driver's side). One caveat, I have heard that California checks the timing on the car to ensure that it hasn't been tampered with. Not sure if this is true or not...
Another option that may be available to you to reduce NOx: This has worked on my 1987 245DL with vacuum ignition advance. Check out my previous post HERE. It lists my before and after data. For the advice on plugging the vacuum line (and confirmation that California checks timing), check out Kane's advice HERE
Good luck with the test, like I said, if you plan on keeping the car, spend the money to tune it up. The investment will possibly be paid off with better gas mileage and peace of mind.
Bean
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'80 242GT 92k, '94 945T 123k
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