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This is from the VEIP website. ( this is the company that does the emissions testing for maryland.

"1996 or newer model year vehicles weighing less than 8,501 pounds and equipped with a computer controlled engine and fuel system Instead of testing your vehicle's exhaust, your emissions test will involve scanning your vehicle's computer for emission control malfunctions. During an on-board diagnostics scan, a lane inspector will connect to your vehicle's computer through a connector under the dashboard to determine the presence of recorded "trouble codes" that illuminate the "check engine" light on the instrument panel. Vehicles with an illuminated "check engine" light automatically fail the emissions test."

This is supposed to be implemented July 1 2002. My question is this, does this mean that If I install a DET and there are no error codes on the ECU that I will pass the emissions test? Sounds too easy.
 

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Sounds like they are skipping the tail pipe test and doing it the cheap way.
 
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