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Try this and see how you get on.....
If you took it into a dealer they'll bill you £80 to plug in laptop. STOP! Try this........
Arm
yourself with a pen and some paper. Get into your Zaffy and before you
put the key into the ignition make sure that you press the brake pedal
and the accelerator to the floor as far as they will go.
Then turn the key on until the dash board lights come on but DONT START THE CAR
Wait 2 sec and keep the pedals down to the floor and the service light under the management light should start flashing
it will initially flash 4 times leaving 1 or 2 second space representing each number
Zero gets 10 flashes
for exampleP0110
the light will flash ten times Break (2sec Or 1 not sure) then once, (2sec) once again, then ten
If there are more than one code it will stop for a break then gives the next code.
However if you don't have any code stored it will start Flashing and keeps on flashing until you release the pedals.
It should give you a 6 digit number with ECN displayed where the mileage normally is.
Check out this site for the code meanings.
http://www.astraownersclub.com/vb/showthread.php?t=250554
Ignore the ECN and P numbers. You only need the 4 digits.
If
this fails, turn on your radio. Then hold down the SETTINGS button
until you hear a beep. Then press the BC button to scroll through the
ECU diagnostics screen. The fault codes should be at the end of the
list. All the codes before it refer to Hardware, Software, Temp sensor
voltages etc. The codes you need should start ECN.
Even Vauxhall dealers don't know these methods. It will save you some serious cash, hopefully.
Let me know how things go.