P-plater fighting for life after crashing into brick fence in Sydney's west

A 33-year-old P-plate driver is in a critical condition after a crashing his car through a brick fence in the western Sydney suburb of Prairiewood overnight.

Emergency services were called to reports of a crash on Smithfield Road just after midnight.

They were told the car had smashed through the fence of a property before coming to rest in the middle of the road.

The driver was rendered unconscious in the crash and was trapped in his car for a short time, while his female front seat passenger was not seriously injured.

Emergency crews worked to free the driver and he was then taken to Liverpool Hospital.

The 31-year-old female passenger was taken to Liverpool Hospital for observation.

Police are investigating the circumstances surrounding the crash and have spoken to witnesses.

Anyone with information is urged to contact Crime Stoppers on 1800 333 000.