HONDA Main Relay. Over time the solder goes brittle and the contact wear out causing non start issues. This is a direct replacement original part, simply plug it in! This part is over £80 from your local dealer. As with all genuine Honda parts expect perfect fit and performance every time. To fit all Civic EG and EK, Integra Type R DC2, and S2000. Part number: 39400-SR3-003. NOTE: For S2000 fitment, the metal bracket will need pushing out and flipping over before mounting.