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If your vehicle was recently repaired, or if the battery was disconnected, the information in your vehicle’s built-in computer might not be readable, and the test might not be completed. As a result, you’ll have to re-take the test and you could be delayed in getting your licence sticker.

A day or two of normal highway and city driving will usually reset your vehicle’s computer and ensure it’s ready for the Drive Clean test.

You can also take your vehicle through a “generic drive cycle”:

Step 1:	Make sure the vehicle has been parked for eight hours without a start.
Step 2:	Start the engine and let it idle in Drive for two-and-a-half minutes with the Air Conditioning (A/C) and rear defroster on.
Step 3:	Turn the A/C and rear defroster off. Drive the vehicle for 10 minutes at highway speeds.
Step 4:	Drive the vehicle for 20 minutes in stop-and-go traffic.
Step 5:	Your drive cycle is complete. You can now go in for your test.
	Gas tank should be ¼ to ¾ full. Driver should avoid rapid acceleration.

1988 to 1997 model year vehicles require a different test. Find a Drive Clean facility equipped to test older vehicles.