Asked to attend this car which intermittently shows ABS and STOP warning lights. ACR4 and AD lists this as a Bosch 5.3 system and fault code 0280 is listed as unknown code. Code clears down and re-appears after short drive when ABS and STOP warning lights appear. 4 wheel sensors operate ok on live data. Nothing on Google or archives to show what this code means. Ideas anyone? Thanks.