Tell the team before booking. Do not clear codes simply to turn off a warning light before an emissions test. A repair or battery disconnection can affect readiness even when the dashboard light is no longer on.
A technician needs to assess the actual cause and condition. A booking confirmation is not a prediction that the vehicle will pass. Ask about readiness before traveling, especially when the vehicle has just returned from a repair shop.
Official source: CARB test-results guidance.
