We built a KI-Fachberater (AI expert advisor) over 10 weeks — handling vehicle identification, part compatibility, technical advisory, and seasonal demand automation. (1) Fahrzeug-Identifikation (vehicle identification): multi-method vehicle identification — customer providing KBA-Schlüsselnummer (HSN/TSN pair uniquely identifying vehicle type in Germany), VIN for exact configuration, or natural language description. Natural language understanding: "Mein Golf 7, 2.0 TDI, 150 PS, Baujahr 2018, Highline" parsed into exact vehicle specification — Volkswagen Golf VII (5G), EA288 engine, CUNA engine code, 110 kW, identifying suspension variant, brake system, and all vehicle-specific parameters. Ambiguity resolution: when description could match multiple variants, chatbot asking precisely the right differentiating question — "Haben Sie das Sportfahrwerk (Tieferlegung ab Werk) oder das Standardfahrwerk?" (do you have the sport suspension or standard?) rather than asking irrelevant questions. Garage: customer vehicle profiles stored (with DSGVO consent) — returning customers greeted with "Für welches Ihrer Fahrzeuge suchen Sie heute?
Golf 7 TDI oder Ihren BMW F31?" (2) Teile-Kompatibilität (part compatibility): compatibility engine — AI cross-referencing part fitment data across 1.8 million SKUs against identified vehicle specification. Not just "fits your car" but specific compatibility detail — "Diese Bremsscheiben (312x25mm, belüftet) sind kompatibel mit Ihrem Golf 7 2.0 TDI mit der vorderen Bremse PR-Nummer 1ZE" (these brake discs are compatible with your Golf 7 2.0 TDI with front brake PR number 1ZE). OEM cross-reference: AI understanding OEM part numbers and aftermarket equivalents — "Die Bosch-Bremsscheiben 0 986 479 C77 entsprechen der OEM-Nummer 5Q0 615 301 F" (the Bosch brake discs correspond to OEM number...). TÜV relevance: flagging when parts or modifications are TÜV-relevant — "Achtung: Dieser Sportluftfilter erfordert eine Einzelabnahme nach §19 StVZO" (attention: this sport air filter requires individual type approval).
(3) Fachberatung-Qualität (expert advisory quality): technical depth matching human Fachberater — AI knowing torque specifications for wheel bolts (e.g., 120 Nm for most VW applications), brake pad compound differences (ceramic vs. semi-metallic for different driving profiles), and installation requirements. Comparative advisory: "Für Ihren Fahrstil auf der Autobahn empfehle ich die Brembo-Scheiben — die haben bessere Wärmeableitung bei Dauerbeanspruchung als die Standard-Zimmermann-Scheiben" (for your motorway driving style I recommend the Brembo discs — they have better heat dissipation under sustained use than the standard Zimmermann discs). Safety: AI recognising safety-critical parts and providing appropriate warnings — never recommending incompatible brake, suspension, or steering components. Installation guidance: for each recommended part, AI providing installation complexity assessment — "Einbau Schwierigkeitsgrad: mittel. Spezialwerkzeug benötigt: Federspanner für den Stoßdämpferwechsel" (installation difficulty: medium. Special tool needed: spring compressor for shock absorber replacement).
(4) Saisonale Intelligenz (seasonal intelligence): Reifenwechsel assistant: during tyre season, AI proactively helping with complete tyre specification — rim size, ET (Einpresstiefe/offset), bolt pattern, tyre dimensions, speed rating, and TPMS sensor compatibility. "Für Ihren BMW F30 mit 18-Zoll M-Felgen benötigen Sie 225/40 R18 vorne und 255/35 R18 hinten, Geschwindigkeitsindex V oder höher" (for your BMW F30 with 18-inch M rims you need...). HU-Vorbereitung: before German TÜV inspection periods, AI helping customers identify common failure points for their specific vehicle — "Bei Ihrem Golf 7 mit 85.000 km sind häufige HU-Mängel: Bremsscheiben vorne verschlissen, Spurstangenköpfe ausgeschlagen, Abgasanlage undicht" (common HU failures for your Golf 7 at 85,000 km...). Weather-responsive: automatically adjusting recommendations based on approaching season — battery health for winter, cooling system for summer. (5) DACH-Compliance: German regulatory knowledge — StVZO, ABE (Allgemeine Betriebserlaubnis), and Teilegutachten for aftermarket parts.
Austrian adaptation: understanding Austrian Pickerl requirements and §57a compliance for recommended parts. Swiss compliance: flagging when German-market parts may need Swiss type approval or have different regulatory status. DSGVO: vehicle data stored with explicit consent per BayLDA requirements, purpose-limited to part recommendation, with customer right to deletion — "Möchten Sie Ihre Fahrzeugdaten speichern, damit wir Ihnen beim nächsten Mal schneller helfen können?" (would you like to save your vehicle data so we can help you faster next time?).