2023 Audi S3 Tfsi Quattro S-A 2.0L Petrol · AP23 BYC

Fuel economy for the S3 TFSI Quattro is officially rated in the mid-30s mpg, but real-world figures from enthusiastic driving typically fall into the mid-20s mpg. Insurance falls into a relatively high group for a hot hatch, so budget around £900 to £1,400 annually depending on your circumstances, location, and driving history. Road tax for a 2023 petrol of this engine size sits in the higher bands, so expect a non-trivial annual VED bill plus the standard supplementary charge for vehicles over £40,000 new.

Typical maintenance costs are higher than for a standard A3 due to the performance specification. An Audi main dealer service can run £400 to £600, while independent Audi specialists typically charge £250 to £400. The S-tronic automatic gearbox requires a fluid and filter change roughly every 40,000 miles, costing around £400 at a specialist. quattro components such as the rear differential oil and haldex service are additional costs that buyers should budget for. Tyres are a notable recurring expense on this model — performance tyres in the correct size can cost £150 to £250 each and wear faster than standard fitments.

Estimated annual running cost: £2,200 to £2,800

Given the recorded MOT failure where no defects were logged, the most important thing to inspect is the documentation trail explaining why the test failed. Ask the seller for the original failure notice or any correspondence with the test centre. Confirm that the subsequent pass certificate is genuine and check whether any advisories were issued at the pass test that may have been missed in the summary. Inspect the S-tronic gearbox for smooth shifts in both auto and manual modes — any hesitation, jerk, or clunk on changes warrants further investigation, as S-tronic repairs can be costly. Check the haldex coupling and quattro system behaviour, particularly under hard acceleration, for any shudder or warning lights.

For a 2023 vehicle with this mileage, the bodywork and interior should be inspected for signs of accident repair or unusual wear. Check the alloy wheels for kerb damage (a common issue on performance hatchbacks), and examine the brake discs and pads — although relatively new, performance braking systems can suffer from corrosion if the car has been garaged or used lightly. Inspect all four tyres for even wear, as uneven wear patterns can indicate alignment, suspension, or differential issues. The Audi S3 is also prone to carbon build-up on the intake valves due to its direct-injection petrol design, so listen for any rough idling or hesitation on light throttle.

Finally, verify that all driver-assistance systems and electronics are functioning correctly — the S3 is heavily equipped with parking sensors, cameras, and adaptive cruise options depending on spec. Check the infotainment system for software updates and confirm that any optional performance features (such as the magnetic ride suspension, if fitted) operate as intended. A pre-purchase inspection by an Audi-trained technician is highly recommended for this model, particularly one familiar with the S-tronic and quattro drivetrain.