Used Audi RS6 C5 Buying Guide: Fuel Tank, Knee Bolster

A used Audi RS6 C5, the twin-turbo V8 Avant sold new for the 2003 model year in the U.S., is worth buying when the fuel-tank and knee-bolster campaigns are closed, the twin-turbo V8 is healthy and the title is clean. On Nov. 5, 2026, the NHTSA recall API for 2003 returned 11V267000 for a fuel tank that can crack on related A6/S6/RS6 years, and 04V133000 for a knee bolster that can short. Run the VIN on the NHTSA recall lookup before you pay.

Which RS6 this is

Wikipedia lists the C5 RS6 as the first RS6 Avant with a twin-turbo 4.2 V8 and Quattro. It is not a later C6 or C7 RS6. Match the RS badges, brakes and engine codes to the VIN. Our Audi recall check shows the VIN search, and our A6 buying guide covers the quieter sibling.

Fuel tank and knee bolster

Ask for invoices for 11V267000 and 04V133000. Smell for fuel after a drive and look under the rear for tank seepage. A fuel smell with an open tank campaign is a hard stop. Our open recall guide covers how campaigns appear on a report.

Twin-turbo V8, transmission and rust

Listen for turbo whistle that turns into grinding, and check for oil or coolant mixing. Ask when the timing belt and water pump were done if this engine layout uses them on your car, and get receipts. Check rear arches and the spare well. Honestly, these cars are cheap to buy and expensive to ignore.

A test drive that tells you something

Drive it from cold, not after the seller has warmed it up. Listen for ticks and knocks at start-up, watch the mirror for smoke, and check that every gauge and warning lamp comes on and then goes out. Try every gear, a hard stop and a slow full-lock turn both ways, then look underneath for fresh drips. Bring a flashlight and a magnet for filler checks on the lower doors and rear wheel arches.

Insurance, registration and inspection

Call your insurer with the VIN before you pay, because a high-mileage wagon or coupe can be valued low after a loss. Ask your state DMV whether the vehicle needs a VIN inspection, a safety inspection or an emissions test at transfer, and what happens if a prior registration lapsed. Budget for new tires if the date codes are old, even when the tread looks fine.

When to walk away

• An open 11V267000 fuel-tank recall.
• A milky coolant tank or overdue major service.
• A transmission that flares or bangs.
• A VIN that does not match the title.

Questions to ask the seller

• Was 11V267000 done? Was the work done, and is there a receipt?
• Was 04V133000 closed?
• When was the last major engine service?
• Has the title ever been branded?

Reading the history on an older SUV

Do not expect a complete service log. Many independent shops never reported their work, so the report matters most for title brands, odometer readings at title transfers and registration gaps by state. A car that moved from a coastal or rust-belt state to a dry one may have been retitled; look at the dates and ask why. An approved NMVTIS check adds salvage and junk records from insurers and recyclers. If the odometer readings go backward or the car shows as exempt, ask for the paper trail before you price it. Our odometer discrepancy guide explains what those entries mean.

Private-sale paperwork

Most cars like this sell privately. Make sure the name on the title matches the seller ID, the VIN on the title matches the plate and the stamping on the car, and any old lien is released in writing. Our lien release guide walks through that step. Pay by a traceable method, get a dated bill of sale, and do not accept an open title signed by someone who is not present.

How to price it

C5 RS6 wagons sell as modern classics when the tank campaign is closed. Compare recent private sales and dealer listings for the same year, engine and drivetrain, then subtract tank, turbo and service work.

What the report costs

As of early November 2026 a CARFAX bought direct usually costs around $44.99, and AutoCheck sits a little lower. We are a licensed CARFAX and AutoCheck reseller, not affiliated with CARFAX, AutoCheck or Experian. Our guest price has been about $5.50 a report, about $4.50 for members, and about $6.75 for a CARFAX and AutoCheck bundle. Confirm the price at checkout, since it can change.

On a car this old, read the report for title brands and odometer readings first; service entries are often thin.

Sources

• NHTSA recall lookup (API checked Nov. 5, 2026; 2003 RS6: 11V267000 fuel tank; 04V133000 knee bolster short)
• Audi RS 6, Wikipedia
• NMVTIS
• Hagerty (valuation tools)