What’s wrong with that car?

W: My car wouldn’t start in the afternoon. And it stopped many times on the way.
M: How old is your battery?
W: It’s quite new. I changed it three weeks ago.
M: Then would you leave your car and keys here? I’ll cheek it tomorrow.
W: Can you make it a bit sooner?
M: Sorry, Miss. We’ve had many cars here. There is nothing I can do.
W: How much does it cost just to check?
M: Well, it is ＄7 an hour.
W: OK, I’ll call again tomorrow.