Knock Sensor fits MAZDA 2 1.5 2014 on CI P31E18921. MAZDA P31E18921. Type Knock Sensor. MAZDA 2 Hatchback (DL, DJ) 1.5 Hatchback Petrol 08/2014 on FWD 16 75 55. MAZDA 2 Hatchback (DL, DJ) 1.5 SKYACTIV-G (DJLFS) Hatchback Petrol 08/2014 on FWD 16 115 85.