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How to diagnose and repair a faulty engine in an Audi A4?

My 2016 Audi A4 has been making strange noises and experiencing significant loss of power. How can I identify the issue and fix it myself?

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Firstly, check your engine oil level and quality. Low or dirty oil can cause these issues and can be easily fixed with an oil change. If that doesn't solve the problem, you may have a faulty oxygen sensor which can be replaced relatively easily.

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