Honda ACCORD 2020 Owner's Manual page 714

uuEmissions TestinguTesting of Readiness Codes
7. Select a nearby, lightly traveled major highway where you can maintain a speed
of 50 to 60 mph (80 to 97 km/h) for at least 20 minutes. Drive on the highway in
( D (automatic transmission/continuously variable transmission) or 5th (manual
transmission). Do not use cruise control. When traffic allows, drive for 90 seconds
without moving the accelerator pedal. (Vehicle speed may vary slightly; this is
okay.) If you cannot do this for a continuous 90 seconds because of traffic
conditions, drive for at least 30 seconds, then repeat it two more times (for a total
of 90 seconds).
8. Drive in city or suburban traffic for at least 10 minutes. When traffic conditions
allow, let the vehicle coast for several seconds without using the accelerator pedal
or the brake pedal.
9. Park the vehicle and leave the engine off for 30 minutes.
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