What causes the check engine light to come on in a Vauxhall Astra?

I recently purchased a Vauxhall Astra and the check engine light keeps coming on. What could be causing this issue and how can I fix it?

One possible cause could be a malfunctioning oxygen sensor. You may want to take your car to a mechanic to get it checked and replaced if necessary.

Another common reason for the check engine light to come on is a loose gas cap. Make sure to tighten the gas cap after filling up your car and see if that resolves the issue.

It could also be an issue with the catalytic converter. This is a more serious problem but it can usually be diagnosed and repaired by a professional mechanic.

In some cases, the check engine light can come on due to a faulty sensor. If this is the case, it's best to take your car to a mechanic so they can properly diagnose and fix the problem.