Check to make sure the sensors are hooked to the little arms connected to the suspension first. Sometimes they rust and break. I always spray mine with lubricant when I have wheels off. Check wiring connections, etc. It actually is a simple system. Keep us posted. Lots of info here

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Dave S.
Northeast
2003 4.6is
2005 E53 4.4
2003 E39 Msport(a REAL ONE!)
1959 Fiat 600