The roadworthiness test (HU) is a legally required inspection that ensures a vehicle meets the minimum requirements for road safety and environmental compliance. It is carried out by officially accredited inspection organisations such as TÜV, DEKRA, GTÜ or KÜS and ends with a sticker or a defect notice. A used-car inspection, by contrast, is a voluntary, purchase-accompanying check that evaluates the actual condition of a vehicle from the buyer's perspective — wear, accident history, maintenance condition, market value. It goes considerably deeper than the HU and uncovers aspects that play no part in the statutory test.
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HU and used-car inspection: how does the mandatory roadworthiness test differ from a voluntary buyer's assessment?
The roadworthiness test (HU) checks road safety — it is legally required and ends with a sticker. The used-car inspection checks the condition from the buyer's perspective — voluntary, more in-depth, without a sticker. Both inspections make sense, but they do not replace one another.
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What is the difference between a roadworthiness test (HU) and a used-car inspection?
Why the distinction matters
Anyone buying a used car comes across both terms: the vehicle has "fresh TÜV" — or the seller suggests an "ADAC check". Many buyers treat the two as the same thing. That is an expensive mistake.
The roadworthiness test (HU) and the used-car inspection are two fundamentally different instruments with different goals, different inspection contents and different consequences. Anyone who understands the difference can significantly reduce the risk of a bad purchase.
The roadworthiness test (HU): a legal requirement, road safety, a sticker
What the HU is
The Hauptuntersuchung (HU) is governed by the German road traffic licensing regulations (StVZO) and is mandatory for all motor vehicles on German roads. Passenger cars generally have to undergo the HU every two years, the first time three years after initial registration. Shorter intervals apply to certain heavy vehicles and motorhomes.
The HU is carried out exclusively by officially accredited inspection organisations: TÜV (various regional companies), DEKRA, GTÜ and KÜS. These organisations are subject to state oversight and are the only ones permitted to issue the inspection sticker.
What the HU checks
The HU is a safety- and environment-related inspection. The inspecting engineers check whether the vehicle meets the statutory minimum requirements — no more and no less. Among the things checked are:
- Brakes (effectiveness and condition)
- Steering
- Lighting and electrical system
- Axles, wheels, tyres, suspension
- Chassis and bodywork
- Visibility
- Exhaust emissions (emissions test)
- Vehicle identification
The inspection is carried out without disassembly, mostly visually, manually and by measurement.
What the HU does not check
The HU does not assess:
- Engine internals, gearbox, clutch
- Comfort and entertainment electronics
- Cosmetic defects on the bodywork or interior (provided they are not safety-relevant)
- Accident history and the quality of previous repairs
- Odometer reading and possible manipulation
- Maintenance condition and service history
- The vehicle's market value
A vehicle can pass the HU and at the same time have considerable technical defects beyond the inspection catalogue.
The result: a sticker or a defect notice
After a successful HU the vehicle receives an inspection sticker on the rear number plate. It shows when the next HU is due. In the case of serious defects the sticker is withheld; in that case the vehicle may only be moved for repair and the subsequent re-inspection.
The used-car inspection: voluntary, purchase-accompanying, deeper
What the used-car inspection is
A used-car inspection is a voluntary check that the buyer or seller of a used car can commission. It is not legally required, has no official character and ends neither with a sticker nor with an official classification. The result is a detailed inspection report that documents the vehicle's actual condition.
Providers of used-car inspections include specialised companies such as checkdenwagen as well as inspection organisations that offer such services in addition to the HU. The depth of the inspection, its scope and the prices vary depending on the provider and the package.
checkdenwagen does not carry out an HU and does not issue a sticker. The used-car inspection is a standalone product — not a substitute for the statutory roadworthiness test.
What the used-car inspection checks
A good used-car inspection goes far beyond the HU. It looks at the vehicle from the perspective of the potential buyer and evaluates all aspects relevant to the buying decision:
Bodywork and paintwork Paint thickness measurement on all relevant panels, checking the panel gaps between body parts, visual inspection for rust, dents, scratches and signs of previous accident repairs.
Engine and drivetrain Visual inspection for leaks, checking the fluid levels (engine oil, coolant, brake fluid, gearbox oil), assessment of how the engine runs and any unusual noises, condition of the clutch and drivetrain.
Suspension and brakes Condition of the shock absorbers, springs, brakes (pad thickness, disc condition) and steering.
Electrics and on-board electronics Function of all lights, indicators, air conditioning, power windows; OBD fault read-out (fault memory), condition of the battery.
Interior Condition of the upholstery, trim, instruments and safety equipment (seatbelts, airbags).
Tyres and wheels Tread depth, tyre pressure, condition of the rims and wheel bearings.
Documents Cross-checking the stamped VIN, the vehicle registration document and the physical vehicle; checking the service history and HU reports.
The result: an inspection report for the buying decision
At the end of the used-car inspection there is a detailed, digital inspection report. It documents all the points checked, rates any defects found by severity, and gives the buyer a well-founded basis for the buying decision or for negotiating the price. checkdenwagen usually provides the report within 24 hours of the inspection appointment.
The key difference at a glance
| Roadworthiness test (HU) | Used-car inspection | |
|---|---|---|
| Legal basis | Legally required (StVZO) | Voluntary |
| Purpose | Road safety and environmental compliance | Condition assessment from the buyer's perspective |
| Carried out by | Officially accredited inspection organisations | Specialised providers, automotive appraisers |
| Sticker | Yes (on passing) | No |
| Inspection depth | Statutory minimum standard | Deeper, more comprehensive, purchase-relevant |
| Engine/gearbox | Not checked | Checked |
| Accident history | Not checked | Checked (paint thickness, panel gaps) |
| Result | Sticker or defect notice | Detailed inspection report |
Why a fresh HU isn't enough when buying a used car
A common misconception: the vehicle has "fresh TÜV", so everything is fine. In reality, a passed HU only means that the vehicle met the statutory minimum requirements for road safety and emissions at the time of the inspection.
What the HU does not reveal: whether the engine runs with excessive oil consumption, whether accident damage was repaired cleanly, whether the odometer reading has been manipulated, whether the gearbox or clutch is on the verge of an expensive failure, or whether the vehicle is worth its asking price.
These questions are answered by the independent used-car inspection — and when buying a used vehicle they are often the decisive ones.
When each inspection makes sense
The HU is relevant to every owner as a recurring mandatory test. It ensures the vehicle's basic roadworthiness and is mandatory for road registration.
The used-car inspection makes sense when a specific vehicle is up for purchase. It protects against hidden defects and expensive surprises after the purchase, and gives you confidence in price negotiations. It is especially important for private sales without warranty and for vehicles without a complete service history.
The two inspections do not rule each other out — they complement one another. A vehicle with a valid HU and a passed used-car inspection gives the buyer the best possible basis for making a decision.
checkdenwagen: on-site inspection across Germany
checkdenwagen sends an independent automotive appraiser directly to the vehicle — to the seller's private address, to the dealer, or to any other location in Germany. The buyer does not need to be present in person.
Used-car inspection packages from €289 incl. VAT and travel.
checkdenwagen does not carry out a statutory roadworthiness test (HU) and does not issue an inspection sticker.
Found the car you want? Have it inspected before you buy.
Our inspector comes straight to the seller — fixed price from 289 €, report within 24 h.
Frequently asked questions about the HU and used-car inspection
No. The HU (Hauptuntersuchung, the German mandatory roadworthiness test) is a legally required inspection focused on road safety. It ends with a registration sticker and is carried out by officially accredited inspection organisations. A used-car inspection is a voluntary check from the buyer's perspective that goes deeper and evaluates purchase-relevant aspects such as wear, accident history and maintenance condition. There is no sticker as a result.
Found the car you want? Have it independently inspected before you buy.
checkdenwagen comes directly to the vehicle — fixed price from €289 incl. VAT and travel, anywhere in Germany.