A Hauptuntersuchung is not a mystery and not a shakedown — it is a documented checklist anchored in §29 StVZO. This guide walks you through what every inspector looks at, how much it actually costs in 2026, and the small preparations that turn a worrying morning into a twelve-minute appointment.

Every two years, roughly 30 million passenger cars in Germany pass through the same ritual. The TÜV Report 2026 found 21.5% of vehicles had significant or dangerous defects, based on data from 9.5 million inspections between July 2024 and June 2025. A bit of preparation moves you into the other 78.5%.

What the HU actually is (and is not)

The Hauptuntersuchung is a mandatory periodic vehicle inspection defined by §29 of the Straßenverkehrs-Zulassungs-Ordnung (StVZO). It is not a maintenance service — no oil change, no filter replacement happens at a TÜV station. An inspector looks at your car, decides whether it is legal to drive on German roads for the next two years, and assigns a sticker. Five organisations are licensed: TÜV Nord, TÜV Süd, TÜV Rheinland, DEKRA, GTÜ and KÜS.

When is your vehicle due for the next inspection?

A new passenger car gets its first HU 36 months after first registration. Every subsequent inspection is required every two years. The coloured sticker on the right of your rear licence plate — the Prüfplakette — tells you when the next one is due. A two-month grace period follows the due date without penalty. After that, fines begin: €15 (2–4 months late), €25 (4–8 months), €60 plus one Flensburg point (8+ months).

Who can inspect — TÜV, DEKRA, GTÜ, KÜS compared

ORGANISATION HU+AU COST (PASSENGER CAR)
TÜV Süd / TÜV Nord €155–€169.90
TÜV Rheinland €143–€162
DEKRA €140–€160
GTÜ €135–€150
KÜS €135–€150

Source: Handelsblatt TÜV-Kosten 2026 (January 2026) and Motor.com.de state-level comparison (March 2026)

How defects are classified: the Mängelbericht system

CATEGORY (GERMAN) ENGLISH PASS STICKER?
Geringe Mängel Minor defect Yes
Erhebliche Mängel Significant defect No
Gefährliche Mängel Dangerous defect No
Verkehrsunsicher Road-unsafe No (sticker removed)

Source: Anlage VIII StVZO, Nummer 3.1.4, consolidated text as of April 2026

The Abgasuntersuchung: emissions, OBD, and why batteries matter

If your battery was recently disconnected — because you replaced it or a workshop reset the system — the OBD readiness monitors have not yet completed their self-test cycles. The inspector sees NOT READY and the AU cannot be completed. Drive 30 km of mixed-cycle traffic the day before the appointment to complete the monitors.

Key takeaways

  • The Hauptuntersuchung is a statutory inspection under §29 StVZO — not a maintenance service.
  • New passenger cars: first HU at 36 months, then every 24 months.
  • Combined HU+AU for a passenger car costs €135–€170 in 2026.
  • Defects classified into four categories: geringe (minor, pass), erhebliche (significant, fail), gefährliche (dangerous, fail), verkehrsunsicher (sticker removed).
  • The TÜV Report 2026 found 21.5% of inspected vehicles had significant or dangerous defects.
  • A disconnected battery or recent ECU reset prevents OBD readiness monitors from completing — drive 30 km the day before.
  • A failed HU is not a disaster: you have one month to fix defects and re-present at the same Prüfstelle for a partial re-inspection fee.

Sources & methodology

  • Anlage VIII and Anlage VIIIa StVZO — consolidated legal text, April 2026.
  • TÜV Report 2026 — 9.5 million inspections analysed between July 2024 and June 2025.
  • Handelsblatt — TÜV-Kosten 2026, updated 27 January 2026.
  • ADAC — Hauptuntersuchung technical guide and fee overview, updated February 2026.