Audi TT2017

Known issues

• DPF (diesel particulate filter) blockages, particularly on low-mileage or short-trip usage patterns, requiring expensive cleaning or replacement (€800–€1,500)
• Diesel injector carbon build-up and occasional injector failure, causing rough idle and increased emissions
• DSG dual-clutch gearbox judder at low speeds (1st to 2nd gear transition), affecting manual and some automatic variants
• EGR valve problems causing check engine light and reduced engine performance
• Water in diesel fuel issues leading to fuel system corrosion and filter clogging
• Turbocharger bearing wear on higher-mileage examples, resulting in boost loss and oily deposits

Good for

• Engaging handling and responsive steering for a compact sports car
• Reasonable diesel fuel economy (45–55 mpg combined) for those doing mixed motorway driving
• Strong warranty support if purchased with remainder of Audi's factory cover
• Premium interior quality and build finish for the class