The information provided in the compatibility should be used as a guide only. Alternatively, please do not hesitate to send us your vehicle registration prior to ordering so that we can confirm compatibility or guide you to the correct parts you require. O E Q U A L I T Y. Vauxhall Astra G 1.6 Valve: 16 1598cc (From 2003-01-01 To 2004-04-01) Hatchback 99BHP Petrol (Engine Codes: Z16XE).