What document must be provided to a customer if the vehicle is not in English?

When a vehicle's documentation is not in English, it is essential to provide a Buyers Guide or "as is" sticker to the customer. This document is crucial because it informs the buyer about the vehicle’s condition and any potential issues, especially since they might not understand the vehicle history due to the language barrier. The Buyers Guide serves to clarify whether the car is being sold "as is," meaning the buyer accepts the vehicle's condition without any warranties or commitments for repairs from the seller. Providing this information supports informed decision-making, ensuring the customer understands the risks associated with the purchase.

The other documents listed do not serve this purpose. The title transfer document primarily facilitates legal ownership change, but it does not directly address the condition of the vehicle. The service history log details maintenance but may not provide relevant information if it’s not in the customer's language. The insurance policy certificate pertains to coverage agreements and does not help in defining the vehicle's condition for the customer. Therefore, the Buyers Guide is the appropriate document to streamline the transaction and safeguard both the buyer and the seller.