MK1 1989 > 1998. Fits all 1.6 & 1.8 Mk1 MX5 Models, 1989>1998. Mk1 1989>1998. MK2 1998 > 2005. Located at the back of the cylinder head on the right hand side on the engine, these camshaft sensor o-rings often fail which results in a rather large oil leak.