307 hdi90 2002 took car for mot failed on no abs light on startup and abs brake fault on central display, they put it on the computer and said f/o/side and 2 rear sensors faulty so i replaced all 4 sensors making sure they were all seated properly with a 1mm gap took it for retest and failed again no abs light on startup and abs brake fault,could the abs light on the dash be the problem would it need a new dash hope you can help
