WA Police have suspended the use of 11 new mobile speed cameras and will review more than 50,000 infringements after a motorist was incorrectly charged with hooning and had her car impounded.

It is believed the woman was accused of driving at more than 160 kilometres per hour on a Perth freeway.

Police said the cameras in question have caught 53,000 people speeding since they were introduced in January — with a manual screening process later identifying 20 cases affected by the fault.

The woman's case slipped through the screening process and resulted in her being charged with hooning and her vehicle seized by officers, police said.

The driver disputed the speed reading and after reviewing the case, police dropped the charge and returned the car.

Police said the computer programming fault with the new cameras was not identified during pre-rollout testing.

The fault with the cameras was not picked up in pre-rollout testing. ( Supplied: ABC News )

In a statement, State Traffic Commander Scott Higgins said a review of the traffic infringements issued by the cameras was continuing.

"We have checked all infringements resulting in vehicle seizures or court proceedings and we are satisfied these have been correctly issued," Commander Higgins said.

"All other infringements issued by the new cameras are now being manually validated to ensure no one else has been affected."

He said not other speed or red light cameras were affected.

WA Police Minister Michelle Roberts said police made the wrong decision to continue using the new speed cameras after faults were detected in February.

"It's the call that they made, and with hindsight now that we know they've missed one, it would appear that it wasn't the right call and that they should have made that demand of the manufacturer from the beginning," she said.

"They didn't do that."

A police spokesman said the manufacturer of the camera was working to fix the fault.