hi.
 
	I recently changed my 17" alloys for 18" with 225/45 tyres .
 
	the recommended pressures for these are 34psi front and rear for light load.
 
	however, the cars recommended pressures are set at 38 rear =and 41 front, which leads to the warning light coming on on most journeys
 
	can the recommended pressures be reset without a trip to a dealer, or even at all?
 
	chris