Audi Q3 engine malfunctions: A guide to avoid the mess. The Audi Q3 engine is celebrated for its reliability and smooth performance, but even top-tier engines can encounter issues over time. Recognising the symptoms of common Audi Q3 engine problems early can save you from expensive repairs or even an engine replacement. In the UK, some of the most frequently reported issues include engine oil leaks, engine overheating, and faulty oxygen sensors. Each of these problems can lead to a cascade of performance issues if not diagnosed and addressed swiftly.