Models · Audi
Audi RS4 B5 buying guide
The first RS4, an Avant only, built from 2000 to 2001 with a Cosworth-developed 2.7 litre twin-turbo V6, a 6-speed manual and quattro four-wheel drive. Just over 500 came to the UK, and original, well-kept cars are the ones buyers look for.
The versions
- 2.7 V6 biturbo (ASJ, later AZR), 380PS, with two BorgWarner K04 turbos
- 6-speed manual only
- Permanent quattro four-wheel drive with a Torsen centre differential
- Avant (estate) body only
What to check on a B5 RS4
3 model-specific things to look at when you view one. They're a starting point, not the full inspection.
Boost leaks and turbo noise
What to look for: Once the engine is fully warm, accelerate hard in third gear. Boost builds strongly from about 3,000rpm and the car should pull hard to the limiter. A slight whistle under acceleration, a hiss when lifting off, or a turbo that sounds loud and harsh are the things to note. Look for blue smoke in the mirror.
Why it matters: The K04 turbos are normally quiet, so a loud one points to wear. Weak pull is more often a boost leak, a leaking intercooler hose or a failed air flow sensor, all far cheaper than a turbo. Turbo replacement on this engine is a big job, so a diagnostic scan and a boost leak test are worth having before buying.
Misfires and camshaft wear
What to look for: Let the engine idle and feel for a regular pulse or shake through the car, and watch for a flashing engine warning light under load. Ask the seller whether the camshafts have ever been inspected or replaced.
Why it matters: Accelerated camshaft wear affected a small number of these engines, early and late cars alike, and a misfire can be one sign. Most misfires are simpler, such as a coil pack, but a specialist can inspect the camshafts if there's any doubt.
Timing belt and water pump records
What to look for: Look for an invoice naming the timing belt with a date and mileage. The usual advice is to change it every 60,000 miles together with the water pump, and to treat it as due without proof.
Why it matters: The 2.7 V6 uses a belt to drive its camshafts, and a failure causes serious engine damage. A documented, recent change with the water pump is one of the clearest signs of a car that's been maintained properly.
Also in the full guide
- Warning lights for the exhaust system
- Clutch and synchromesh
- Suspension arm bushes and dampers
- The cold start, test drive and paperwork checks for the exact version you're viewing
The full guide to the B5 RS4
The CrankSight guide walks you round the car on your phone at the viewing, with every check for the exact version you're looking at: what to look for, where to find it, and what anything you find is likely to cost. As you go it builds an assessment of that car, and if you view more than one, it lines them up side by side.
£29 for the model, used on as many cars as you like, delivered within 72 hours or your money back.
Other generations
General points for the model, last checked October 2026. Every car is different, so treat this as a guide to what to look at, not a verdict on any car. CrankSight is independent and has no connection with Audi.