vauxhall data files astra repairs.
Can you provide a ref, as I can't find it 
you should find the vauxhall astra data files repairs its on the garage site and manufacture, its on there data list you will need to log in with your details. look under 2001- 2005 astra report logs. other sites you need to log into as well, cannot link to this site cannot even copy and paste nothing comes up on here or in note pad so think its locked
also its in german not english will need transater if you dont know german 
just been looking more into it and says egr fail and wiring to ecu.
shell petrol seam to sort out most problems ( this is custumers report after fault was not fixed about 30 custermers) no fault code stored
coil pack and wiring faults with single misfire.
random fault codes, garage reports that taking off battery from an hour has help with the fault codes when battery is refitted and fully charged. and list pointed to egr fault and ecu wiring.
another one was vibration effecting the ecu.
evpa vale sticking.
ect circuit fail in ecu.
engine temp sensor and wiring.
and ecu failed, and sent to repair and found no faults with it, put back on and then there is no faults stored.
ecu rubber seal and corroded pins on plug.
ecu turning off injectors, (tec) say ecu thinking they are cloged up or low fuel turning them off.
fuel sensor incorrect signal faulty wires.
low fuel level misfire, ( garage tec advied not to run on red line, and keep fuel level above this) also this caused multiple cylinder misfire.