Operation CHARM: Car repair manuals for everyone.

Catalyst Monitor Repair Verification

1. Make sure that the inlet air temperature (or ambient air temperature) is above -18°C (0°F), then refer to Step 3 of the Vehicle Preparation for OBD II Drive Cycle.
2. Start the engine and drive the vehicle for 25 minutes.
a. Drive in stop-and-go traffic for 20 minutes, include six different constant speeds between 40 and 72 km/h (25 and 45 mph).
b. Drive on expressway or highway for an additional 5 minutes.
3. Rerun Quick Test.