What is the most common issue with the Vauxhall Astra's engine?

I have been experiencing trouble with my Vauxhall Astra's engine lately. It seems to be making a strange noise and is not running as smoothly as it used to. Can you provide some advice on what the possible issue might be and how to fix it?

The most common issue with the Vauxhall Astra's engine is a faulty knock sensor. This can cause the engine to make unusual noises and affect its performance. It is recommended to get it checked and replaced by a qualified mechanic.

Another possible issue could be a clogged fuel filter, which can also lead to engine problems. I suggest getting it checked and cleaned or replaced if necessary.

It could also be a problem with the ignition coils, which can cause misfiring and loss of engine power. I recommend taking your car to a reputable mechanic for a diagnostic test to determine the exact issue.