FIAT 0000046815152, 0000055269065, 46538111, 46815152, 55190562, 55269065. Type Knock Sensor. FIAT SIENA (178_, 172_, 372_) 1.6 16V Saloon Petrol 09/1998 12/2009 FWD 16 101 74. FIAT SIENA (178_, 172_, 372_) 1.3 (178CXS1AAI, 178BYA1AAT, 178CYA1AAT) Saloon Petrol 09/2001 12/2012 FWD 8 60 44.