Holden Astra 2005

Holden Astra 2005 Q&As

Check out real-world situations relating to the Holden Astra 2005 here, particularly what our experts have to say about them.

• Why is there a knocking noise under the bonnet before starting the engine of my 2005 Holden Astra?

  You’d expect any noise from under a car’s bonnet to be caused by the engine, but if this noise occurs before you’ve started the engine, you’re on to a real mystery. Perhaps the noise can be heard as you crank the engine but before it actually fires? If that’s the case, the clunk or knock could be coming from the starter motor. Or perhaps the action of the starter motor is causing the engine to rock back and forth on worn engine mounts and allowing the engine to hit on the cross-member or some other component under the bonnet. Perhaps it’s a loose exhaust system that’s banging on something as you crank the engine. Once the engine fires and is running, the frequency of its vibrations changes and the clunk goes away.

  But I’m afraid that without more information, this one remains a mystery to us.

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• Holden Astra 2005: What is it worth with a broken convertible roof?

  I doubt that you would be given a roadworthy if you can't open the boot. It's very difficult to put a value on it, but I wouldn't pay more than $1000-$1200 given its current condition. You'd be better off getting it repaired, so the roof does work and the boot opens.

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• Oxygen sensor on 2005 Holden Berlina

  Based on your mechanic's diagnosis it would seem that the oxygen (02) sensor is probably faulty and needs replacing. There is no connection with the car's heater. If there is a problem with the heater it's different one.

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• Holden Astra 2005: Why is it losing drive when upshifting?

  That's a tough one, but you would have to think it's external to the transmission given it's twice been replaced. It could be a number of problems, from a speed sensor, the gear position switch or the ECU. The best thing is to get it to an auto transmission specialist and have it checked.

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