ONTD

Law enforcement sources tell TMZ ... Lindsay Lohan lied to cops Friday by telling them she was NOT driving the Porsche that slammed into a truck on Pacific Coast Highway, and as a result she could be prosecuted and her probation could be revoked.

Our sources say, when Lindsay was in the hospital getting checked out after the accident, cops from the Santa Monica Police Dept. paid a visit. Lindsay told police she was a passenger in the Porsche and her assistant was driving. But the lie didn't stick because later Lindsay's assistant later told police Lindsay was behind the wheel.

We're told police are writing up a report that will include Lindsay's lie. It's a crime to provide false info to a police officer. In addition, lying to police could trigger a probation violation in her shoplifting case, which means she faces the possibility of jail on 2 fronts.

Several eyewitnesses at the scene tell TMZ, after the crash Lindsay and her assistant both got out of the car on the passenger side, which means Lindsay had to climb over the console. It appears Lindsay had concocted the lie almost immediately after impact.

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