Can a smog check inspector test a vehicle without contacting the customer first if keys and instructions have been left?

The requirement for a smog check inspector to contact the customer before testing the vehicle is rooted in the principles of customer service and consent. Inspectors must ensure that customers are informed about the testing process, any potential issues with the vehicle, and the necessity for their approval for the work to be done. This establishes transparency and fosters trust between the customer and the service provider. Additionally, contacting the customer gives them an opportunity to ask questions or address concerns, ensuring that they're aware of any risks or responsibilities involved in the smog check process. Leaving keys and instructions does not obviate the need for direct communication and consent from the customer; it is simply a procedural element that does not replace the fundamental requirement for customer notification and approval before performing a service on their vehicle.