RAY: A few months ago, we needed a part called a "map sensor" for a customer's Toyota Celica. It's a fairly expensive part, so I wanted to check with the customer before ordering one. I called him five or six times, and there was no answer. I realized he had probably given me his home number, and he was at work.

Finally, late in the day he calls and asks, "Is my car done?" I say, "No, it's not done." I explained that he needs this expensive part. And he tells me to go ahead and order it.

I call the dealer. The phone rings and rings and rings, and I look and I notice it's 5:01 pm. All the dealerships are closed! After five minutes of moaning and groaning, I had an inspiration. And the next morning, I had my part.

How did I do it?

[ Car Talk Puzzler ]