Lindsay Lohan Under Investigation For Lying To Police

Law enforcement sources tell us ... Santa Monica police detectives have been trying to get in touch with Lindsay to ask her questions about a car crash last June, when she slammed into a big rig on Pacific Coast Highway. Sources say Linsday's lawyer, Shawn Holley, called the station and complained that cops should not be calling Lindsay directly because she has an attorney.

We broke the story ... Lindsay lied to cops when she told them she was NOT the driver, but a passenger. Cops are convinced Lindsay was indeed behind the wheel and are now investigating.