KNBC's undercover camera has caught more car repair scammers. This time, Grover's web snared EZ Lube, "California's fastest growing lube and tune chain." Says the Channel 4 website:

Under the hood of KNBC's undercover test car, cameras are watching mechanics from every angle. Like at an EZ Lube on Pacific Coast Highway in Lomita, where they recommend a transmission flush using a high tech machine to suck out all the old fluid.

"And you guys said you use a machine, right," an undercover KNBC customer asks the technician.

"Yeah, that's the machine," he replies.

But they never used a machine and instead just drained and refilled a few quarts of fluid. That's a $39 service, but they charged the NBC undercover customer for a $99 Machine flush....

Another day, at a Costa Mesa EZ Lube, they tell an undercover NBC customer they're going to change a fan belt....But all they did was polish the old belt and leave it on. Something the manager wouldn't talk about with KNBC Investigative Reporter Joel Grover.

"You said you put a new belt on that car and you never did," Joel asked the manager. He had no reply.

Tonight's investigation: A new look at the fire protection system at Staples Center, on the news at 5 and 11 pm. The first installment in December won a Murrow award for KNBC.