Where is the VIN on Audi A6?

Check the stamped VIN on the firewall inside the plenum chamber under the wiper cowl (rear of engine bay). Also check the VIN plate at the bottom corner of the windshield, viewable through the glass.

Which VIN location is the most important for Audi A6?

The stamped VIN on the body (firewall/plenum chamber) is the most important because it’s permanently marked into the chassis and is harder to alter than stickers or plates. Use it as the primary verification point when buying or inspecting.

Where is the VIN in Audi A6 (C6)? - Location Guide

This guide shows where to find the VIN (chassis number) on the Audi A6 C6, produced between 2005–2010, using the most consistent factory locations you can physically verify on the car.

Chassis Number Locations

1) Stamped VIN on Firewall (Plenum Chamber)

Where to look: In the engine bay at the center-rear, stamped into the metal firewall inside the plenum chamber (the recessed area between the engine and the windshield). On LHD cars it’s usually slightly toward the passenger side.
Access: Open the hood → locate the plastic cowl near the wipers → pull up the rubber weather strip that runs horizontally across the back of the engine bay → lift the plastic plenum cover to expose the stamped VIN. This spot is commonly hidden by trim and sits deep under the windshield overhang.
Note: This firewall/plenum stamping is generally in the same “rear of engine bay” area on LHD and RHD cars, even though “left/right” cabin references may differ by market.
Tip: Because it’s recessed and shadowy, use a flashlight and let the camera do the reading—scan the stamped VIN directly with ScanVin.app instead of trying to squint and copy characters.

2) VIN Plate at Bottom of Windshield (Dashboard)

Where to look: At the bottom corner of the windshield on the left side (LHD/driver side), viewed from outside through the glass.
Access: Stand outside the car and look through the windshield at the dash corner—wipe the glass if there’s grime, condensation, or ice/snow buildup.
Note: On RHD models, this windshield VIN plate is typically mirrored to the opposite side.
Tip: Windshield VINs are notorious for glare and reflections—capture it cleanly with your phone using ScanVin.app so you don’t misread characters like B/8, S/5, or 0/O through glass.

3) B-Pillar / Driver Door Jamb VIN Sticker (If Present)

Where to look: Open the driver’s door and inspect the B-pillar/door jamb for a black regulatory sticker that includes the VIN.
Access: Just open the door and look straight at the pillar area; no tools needed. If it’s dirty, scrub lightly with a damp microfiber to reveal the print.
Note: On older C6 cars this sticker may be missing (peeled off, replaced after bodywork, or removed). Don’t panic—use the firewall stamping as your primary verification.
Tip: If the sticker is there, it’s high-contrast and scans easily—use the free VIN reader on ScanVin.app to avoid typing errors.

Video Guide

Video Tutorial: Where is VIN Number Location in AUDI A6 C6 ( 2004 - YouTube

▶ Watch Audi A6 VIN Location Guide

Clear walkthrough on an Audi A6 C6 showing the firewall/plenum stamped VIN and the windshield VIN, with a note that the door sticker may be missing on some cars.

Common Problems & Troubleshooting

You can’t see the stamped VIN in the engine bay: It’s often covered by the plastic cowl and rubber seal—lift the trim and aim a light into the recessed plenum area.
Windshield VIN won’t read: Glare, reflections, or dirt/ice can hide characters—clean the glass and change viewing angle (stand slightly to one side).
Door jamb sticker is missing: Stickers can be removed or lost with age/bodywork; always cross-check against the stamped firewall VIN, which is the most authoritative physical marking.

Where is the VIN number in Audi A6 (C6) (C6) [2005-2010]?