A2Z GREENSBORO · IDENTIFICATION HELP

Find your converter by vehicle brand

Choose a make to see where to look for markings. Add the year, model and engine when requesting a quote. Brand guidance narrows the search; it does not confirm the exact converter fitted to a specific vehicle.

Vehicle makeYear, if knownModel, if known

Audi converter identification

Open this brand’s guide →

Where to find the number

Inspect the shell, shield and area beside the VW / Audi emblem. Capture all separate lines and suffix letters.

What to photograph

VW and Audi share some markings. Foil and diesel-filter units require different evaluation; model and engine details help.

Marking examples

5Q0 131 701 N1K0 131 701 BS

Examples and prefixes only. A matching fragment does not confirm identity, fitment or price. Send all letters, numbers and suffixes.

Gently wipe loose dirt from an already removed, cool unit. Keep shields and components together; send photos before cutting or dismantling anything.

Send this vehicle’s photos for a quote

Compare example shapes

These show general converter categories, not a verified fitment gallery for Audi. Your original or replacement unit may look different.

Small Foreign Cat general shape example — Small Foreign Cat · view category

Large Foil/Wire Cat general shape example — Large Foil/Wire Cat · view category

No code visible? Include one full-length photo, both ends, shield details, oxygen-sensor positions and any separate numbers. A2Z can review the photos. There is no automatic guaranteed valuation or exhaustive year/model converter database on this page.

Request an A2Z quote by email

Send the complete converter, both ends and close-ups of every marking. A2Z reviews the details and replies by email. No readable number? Send photos anyway.

First name *Last name *Email for your quote *Phone (optional)Vehicle year, if knownVehicle makeModel, if knownEngine / fuel, if known

Serial number / all stamped markingsNo readable number / I need identification helpConverter photos *1–6 JPEG, PNG or WebP photos. Maximum 5 MB each, 24 MB total. You can use your phone camera or photo library. Do not upload a driver’s license or other sensitive documents here.Seller category *Additional detailsI own the material or am lawfully authorized to sell it. If it was given to me, I can document the transfer and lawful source. My information is accurate.I agree to the A2Z purchase-review terms and the use of my details and photos to respond to this request. I understand this is a quote request, not an approved purchase.

ID, supporting documents, signed purchase receipt and any required fingerprint are completed and verified before a purchase. An ownership checkbox alone does not establish seller eligibility.