What “VAG” covers here
We mean Volkswagen Group passenger and light-commercial ECUs that expose Schutz Fahrzeug Diagnose locks — VW, Audi, Škoda, SEAT/CUPRA and related MAN-linked platforms when the same security dialogs appear.
Brand badges matter less than ECU software generation: identical routines often span multiple marques.
sfdcode only supports authorised workshop scenarios — misuse requests are declined.
VAG SFD — generation 1 in practice
Technicians usually label this simply “SFD” or generation 1.
Your scan tool exports an offline challenge (hex string or QR); our backend derives the unlock token automatically once payment clears.
Delivery is measured in seconds to about a minute — ideal for bays that cannot afford hour-long waits.
Pricing stays lowest because cryptography scales without per-job human labour.
VAG SFD2 — generation 2 in practice
SFD2 reflects newer protections on MQB Evo, PPE and evolving MEB stacks — supplier contracts mean tokens cannot be minted purely inside our datacenter.
We broker challenges through audited partners; fulfilment aligns with our published manual SLA (typically hours, not seconds).
Expect higher price points — you are paying for operator coordination and scarce supplier capacity, not just TLS uptime.
How to identify which generation an ECU wants
Trust the diagnostic session first: OEM-grade tools increasingly print explicit generation labels alongside SFD dialogs.
Never infer solely from model year forums — identical chassis codes shipped mixed ECU revisions.
If wording is ambiguous, capture screenshots (blur sensitive IDs) and email support before purchasing.
Stale offline challenges also mimic wrong-generation failures — always regenerate immediately before checkout.
Checkout discipline for workshops
Guest checkout forces an explicit generation toggle — mirror exactly what the ECU reports.
Panel customers should segregate prepaid credits per generation so technicians cannot accidentally debit the wrong bucket mid-shift.
Document module hex ID plus generation pairs for fleet vehicles — repeat visits become painless.
Pack purchases of ten or more credits route through the signed-in credits shop — keep procurement aligned with accounting policies.
Where to go next
Need tool-specific screenshots? Continue with OBDeleven, VCDS, VCPC or Autel guides.
Buying once? Guest checkout stays fastest.
Running volume? Load prepaid packs after signing into the panel.