A Mercedes used-car inspection is a professional on-site inspection of a used Mercedes-Benz by an independent appraiser — directly at the seller's, at a fixed price from €289 incl. VAT & travel. checkdenwagen.de is an independent, Germany-wide provider of on-site used-car inspections, based in Berlin with a network of inspectors all across Germany. Our four-part USP: independent of the seller, available throughout Germany, a fixed price with no hidden costs, and a digital photo report within 24 hours. Mercedes-Benz has stood for engineering quality for decades — but in the used-car market that is no free pass. Premium models in particular develop costly quirks with age: the Airmatic air suspension in the S-, E- and GLE-Class is a known weak point, as are the timing chain of the OM651 diesel and the idler-gear issue on the V6/V8 engines. Our inspector assesses your chosen Mercedes on site for around 1.5 hours using a checklist of over 100 points — with a focus on the brand-typical weak spots that never appear in the listing. Within 24 hours you receive a digital photo report as the basis for your purchase decision or price negotiation.
Have a used Mercedes-Benz inspected: on-site used-car inspection, from €289
A used Mercedes sounds like premium — but Airmatic compressors, faulty timing-chain sprockets and deleted fault codes can quickly cost more than the purchase price. Our inspector comes straight to the vehicle: over 100 checkpoints, OBD read-out, paint-thickness measurement. Digital report within 24 hours. From €289 incl. VAT & travel.
Why a Mercedes should be inspected with particular care
Complex electronics with expensive knock-on faults
For years Mercedes-Benz has used densely networked control-unit architectures — from the Comand infotainment to the Airmatic ECU and driver-assistance systems. A single defect can cascade and knock out further systems. Our inspector reads all accessible control units via OBD and assesses whether faults were deleted shortly before the sale.
High repair costs due to spare parts and workshop prices
Genuine parts and special tools make Mercedes repairs more expensive than on volume brands. A new Airmatic compressor costs several hundred euros — without fitting. A faulty OM651 timing-chain sprocket requires removing the engine. These costs rarely appear in the listing, but they do appear in our report.
Odometer tampering on ex-company-car returns
Mercedes-Benz is one of the most heavily used brands in the company-car and leasing sector. Returns with deliberately low mileage or a tampered odometer are no rarity. Our inspector cross-checks OBD-stored mileage, service booklet and vehicle condition for consistency.
Respray and accident history hard to spot on used cars
Cosmetically reconditioned used Mercedes are barely distinguishable from as-new condition thanks to professional polishing and detailing. Our digital paint-thickness measurement shows to the millimetre whether a panel has been resprayed or whether filler is concealing accident damage — with a heatmap in the report.
Mercedes weak spots: what our inspection specifically checks
Airmatic air suspension (S-, E-, GLE-Class)
The Airmatic air suspension is one of the most expensive weak points on used Mercedes-Benz S-Class (W220, W221, W222), E-Class (W211, W212) and GLE/ML (W164, W166) models. Porous air bellows make the vehicle sink on one side or overall — often only visible after a standing test of several hours. The compressor can also fail on heavily used examples. Our inspector checks the ride-height behaviour with the engine running and after standing time, listens to the compressor and evaluates Airmatic-specific OBD fault codes.
OM651 diesel: injectors and timing chain
The OM651 four-cylinder diesel (C-, E-, GLK-Class, Sprinter) is one of the most widespread Mercedes engines — and one of the most fault-prone of recent times. Known weak points: piezo injectors that fail at high mileage, a fragile plastic timing-chain sprocket, and a timing chain that overstretches and rattles when oil changes are skipped. Our inspector checks the engine for rattling on a cold start, evaluates OM651-specific fault codes and cross-checks service-booklet entries for regular oil changes.
M272/M273 V6/V8: idler gear and balance shaft
The V6 and V8 petrol engines of the M272 and M273 series (E-, S-, ML-Class of the mid-2000s) are known for a design flaw: the idler gear of the balance shaft is made of sintered material and breaks at higher mileage — the result is engine damage with repair costs of several thousand euros. Our inspector specifically asks for the maintenance-history check and evaluates the OBD camshaft and crankshaft correlation faults that are regarded as an early indicator.
7G-Tronic and 9G-Tronic automatic transmissions
The 7G-Tronic transmission (7G-DCT variants and the classic torque-converter automatic) is fitted in almost all Mercedes models of the 2005-to-2015 era and has a known weak point: the transmission control unit (mechatronics) tends to develop internal oil leaks, leading to jerky shifts, delays and, in extreme cases, transmission failure. The newer 9G-Tronic shows jerking on some examples when pulling away and in the lower rev range. Our inspector tests all gear ranges on the test drive and reads the transmission control unit for stored faults.
Rust on early A-Class (W168/W169), C- and E-Class (early 2000s)
Older Mercedes models from the early 2000s are no guarantee against rust. The first and second A-Class (W168, W169) show typical rust spots on wing edges, sill ends and the lower edge of the tailgate — especially on vehicles driven in road-salt regions. The C-Class (W203) and E-Class (W211) also have weak points on the underbody panelling and the A-pillar. Our inspector searches specifically at these spots and documents every finding photographically.
SBC electro-hydraulic braking system (early E- and SL-Class)
Sensotronic Brake Control (SBC) was fitted in the E-Class W211 and SL R230 of the early 2000s — an electro-hydraulic braking system that drastically reduces braking performance if the control unit fails. Mercedes offered a goodwill arrangement for certain model years, but many vehicles were never rectified. Our inspector checks the SBC control unit for fault codes and tests the quality of the brake response.
Turbocharger and EGR valve on diesel models
Besides the OM651, other Mercedes diesel engines (OM646, OM642 V6) also show fault-prone turbochargers and clogged exhaust-gas recirculation (EGR) valves. An oil-fouled intercooler, bearing play on the turbocharger or a blocked EGR valve are typical findings on high-mileage used diesels. Our inspector checks the charge-air system for oil traces, listens to the turbocharger under load and evaluates EGR-specific fault codes.
Comand infotainment and electronic components
The Comand navigation system and the associated electronic architecture of older Mercedes models are considered expensive to repair. Faulty Comand units, failed screens or defective interface modules are frequently encountered on W211, W164 and W221 models. Since used parts are scarce and new units are expensive, a close inspection before purchase pays off. Our inspector tests all controllable functions and reads the Comand fault memory where accessible.
Air-conditioning compressor and AC system
The air-conditioning compressor is a frequent cost item on Mercedes-Benz models of high age and mileage — especially when the air conditioning has gone unused or unserviced for long periods. Bearing damage and internal seal problems lead to noises when the compressor engages and to a loss of cooling. Our inspector tests the air conditioning at operating temperature for cooling performance and compressor noise.
Service-booklet gaps and maintenance history
Used Mercedes-Benz cars from the company-car or leasing sector often have patchy service booklets — either because non-franchise workshops serviced them without a stamp, or because entries were added retroactively. Our inspector cross-checks entry dates, stamp impressions and mileage readings against the vehicle's age and the manufacturer's service intervals, and flags inconsistencies explicitly in the report.
Know the weak spots — ready to get your Mercedes-Benz inspected?
Fixed price from 289 €, on-site appointment within a few days. We coordinate everything with the seller.
Which Mercedes series we inspect — and what to watch out for
Our inspection network covers all common Mercedes-Benz model lines. Some series call for special attention: A-Class (W168, W169, W176, W177): The first generations show rust problems on the wings and sills; newer generations (W176/W177) are fitted with the OM651 or its successors and carry the diesel risks described. C-Class (W203, W204, W205): The W203 is more rust-prone than its successor; in the diesel variant the W204 and W205 are equipped with the OM651. 7G-Tronic transmission problems are also documented here. E-Class (W211, W212, W213): The W211 combines the SBC braking risk with the M272/M273 idler-gear problems. The W212 and W213 come in many variants with Airmatic and the OM651 diesel. S-Class (W220, W221, W222): The brand's flagship — and the series with the highest repair risk. Airmatic is standard here, electronic complexity is at its peak, and spare-part prices are high. GLE/ML (W164, W166, W167): The SUV models combine the Airmatic risk with the OM642 diesel and the M272/M273 petrol engine. Particularly popular, but also particularly risk-laden used cars. GLC (X253, X254), GLK (X204): Compact SUVs with the OM651 diesel in many configurations — the weak points described above apply identically here. SL (R230, R231): A sporty roadster with SBC brakes (R230), complex electronics and an Airmatic option. Buying without an inspection is especially risky here. We inspect all of the series listed and more — give us a call (030 301 32 327) if you're unsure whether your desired model is covered.
Mercedes-Benz models inspected in detail
Mercedes-Benz C-Klasse
Model-specific weak spots & inspection for the Mercedes-Benz C-Klasse.
Learn moreMercedes-Benz E-Klasse
Model-specific weak spots & inspection for the Mercedes-Benz E-Klasse.
Learn moreMercedes-Benz A-Klasse
Model-specific weak spots & inspection for the Mercedes-Benz A-Klasse.
Learn moreMercedes-Benz GLC
Model-specific weak spots & inspection for the Mercedes-Benz GLC.
Learn moreMercedes-Benz GLE
Model-specific weak spots & inspection for the Mercedes-Benz GLE.
Learn moreMercedes-Benz S-Klasse
Model-specific weak spots & inspection for the Mercedes-Benz S-Klasse.
Learn moreMercedes-Benz GLA
Model-specific weak spots & inspection for the Mercedes-Benz GLA.
Learn moreHow your Mercedes inspection works
Book online — the listing link is enough
Tell us the vehicle's location (postcode) and the link to the listing. The travel fee is shown to you transparently right away — before you pay. No call needed, no hidden costs.
Inspector drives straight to the Mercedes
An experienced automotive appraiser from our network coordinates the appointment directly with the seller. They inspect your chosen Mercedes on site for around 1.5 hours — systematically, with their own measuring equipment, free of sales pressure. You don't have to be present.
Digital report within 24 hours
You receive the full inspection report by email: a paint-thickness heatmap, OBD findings, photos of every defect and an overall rating for each inspection category. Clearly structured and ready to use in negotiation.
Which package suits your Mercedes-Benz?
Standard Check
Travel included
- Certified experts
- Engine check
- Transmission check
- OBD fault readout
- Brake inspection
- Paint thickness measurement
- Accident check
- Visual bodywork inspection
- Tire tread check
- Visual interior inspection
- Electronics function test
- Vehicle document check
- Photo documentation
- Seller rating
- Market price assessment
- Vehicle price comparison
- Repair cost estimate
- VIN lookup
Premium Check
Travel included
- Certified experts
- Engine check
- Transmission check
- OBD fault readout
- Brake inspection
- Paint thickness measurement
- Accident check
- Visual bodywork inspection
- Tire tread check
- Visual interior inspection
- Electronics function test
- Vehicle document check
- Photo documentation
- Seller rating
- Market price assessment
- Vehicle price comparison
- Repair cost estimate
- VIN lookup
- Everything in Standard plus market value, repair cost estimate, seller rating & VIN lookup.
What our customers say
“I had my 5 Series inspected before buying — the report was very detailed and made my purchase decision so much easier.”
Emre E.
Berlin
“When the vehicle wasn't available for the viewing after all, the refund was completely hassle-free. Very fair and transparent.”
Bartosz K.
Hamburg
“The Premium package gave me a clear overview of the expected repair and maintenance costs. Exactly what I needed.”
Amir O.
Munich
“Excellent knowledge of the German car market, the dealer landscape and price ranges. Highly recommended.”
Denis B.
Cologne
Mercedes-Benz check in your city
Berlin
On-site used-car inspection in Berlin.
Learn moreHamburg
On-site used-car inspection in Hamburg.
Learn moreMünchen
On-site used-car inspection in München.
Learn moreKöln
On-site used-car inspection in Köln.
Learn moreFrankfurt am Main
On-site used-car inspection in Frankfurt am Main.
Learn moreStuttgart
On-site used-car inspection in Stuttgart.
Learn moreFrequently asked questions about the Mercedes used-car inspection
The Standard inspection costs from €289 incl. VAT, the Premium package from €339 incl. VAT. On top comes a travel fee that depends on the postcode of the vehicle's location and is shown to you transparently at booking — before you pay. There is no hourly rate and no fine print.
Buy your Mercedes with facts, not gut feeling.
Airmatic damage, OM651 injectors, timing-chain sprockets and 7G-Tronic issues can quickly cost more than the asking price suggests. Our inspection gives you the facts — within 24 hours, from €289 incl. VAT & travel.