The engine identification is engraved on the flattened surface of the oil filter housing
vauxhall vectra 2.2 z22se engine has a chain
Unsurprisingly, it is 2198 cc, 4 cylinder 147HP/108kW engine. Engine code is: z22se Check out: www.z22se.co.uk
You don't say what year your motor is,but assuming this is the Z22SE engine,it will have a chain.(Check engine options in owner's handbook)Don't think there are any variations on 2.2 petrols,so you should be ok.
The 2.2 engine in these car's are known as the Z22SE by Vauxhall. It's 2198cc, DOHC, 16v, Normally aspirated engine mated to a front wheel drive transmission. Which produces 144bhp@5800rpm and 149lbf of torque@4000rpm. Which gives a 0-60 time off 8.2 seconds and a top speed off 133mph and first went on sale in Astra SRI trim in 2000.