NSW Police have raided the home of colourful former Auburn deputy mayor Salim Mehajer, as the property developer comes under pressure over a string of criminal charges.

A spokeswoman for NSW Police confirmed on Wednesday that police were conducting a "planned operation" at premises in south-west Sydney relating to an "ongoing investigation".

It is understood the raid relates to a car crash Mr Mehajer allegedly had in Lidcombe on October 16 on the way to an assault trial in Sydney's Downing Centre Local Court.

Mr Mehajer, 31, has previously rejected claims he staged the crash to avoid the trial, the first of two assault trials that were expected to be heard in the same week.