The Porsche 911 is Germany's most sought-after sports-car object in the used market — and, in the 996 and 997.1 generations, simultaneously one of the riskiest vehicles you can buy without an independent expert inspection. checkdenwagen.de is an independent provider of on-site used-car inspections operating across Germany, based in Berlin with a network of inspectors throughout the country. Our inspector comes directly to the vehicle's location — no towing, no workshop appointment, no sales pressure — and assesses your prospective 911 for about 1.5 hours against an inspection catalogue of over 100 points. The decisive risk when buying a 911 lies in the M96 and M97 flat-six engine of the 996 (1997-2005) and 997.1 (2004-2008) series: the intermediate shaft bearing — known in the community as the IMS bearing — can fail without any warning and in doing so trigger engine damage that is economically equivalent to a total loss. Closely linked to this is bore scoring: wear of the cylinder bores caused by gaps in oil supply at a low oil level under load — subtle, costly and not directly visible without an endoscopy. On top of this come track-day detection, clutch condition, PDK mechatronics (from the 997.2), PCCB brakes and the assessment of the Porsche service history for gaps and originality. Our USP: independent of the seller, transparent in price, on-site across Germany. Phone: 030 301 32 327.
Have a used Porsche 911 inspected: on-site used-car inspection, from €289
A Porsche 911 with 70,000 km, a complete service book and a flawless listing can have an intermediate shaft bearing that is about to burst. On the 996 and early 997.1 with the M96/M97 flat-six engine, the IMS bearing is the most expensive and most dangerous weak point in the entire Porsche used market — and for a layperson without equipment it is simply invisible. On top of that come bore scoring in the cylinder bores, track-day history, the clutch and the PDK. Our inspector comes directly to the vehicle, checks over 100 points with an explicit 911 focus and delivers a digital photo report to you within 24 hours. From 289 euros incl. VAT and travel.
Porsche 911 inspection: what our appraiser checks
Over 100 inspection points — 911-specific
Our inspection catalogue is tailored to the generation of your 911: the IMS bearing and bore scoring on the 996/997.1, PDK mechatronics from the 997.2, track-day indicators and a complete Porsche service history are the focus.
Report within 24 hours
Digital photo report by email within 24 hours of the on-site inspection — annotated findings, paint thicknesses, OBD readout of all control units, photos of every anomaly.
From 289 euros incl. VAT
Fixed price from 289 euros (Standard) or 339 euros (Premium), each incl. VAT and travel. Transparent cost statement before booking — no hourly rate, no fine print.
Independent of the seller
No interest in closing the sale, no commission, no closeness to dealer or private seller. Our inspector works exclusively for you — that is the foundation of the independent inspection.
Porsche 911 generations: 996, 997, 991, 992 — four risk profiles compared
Since 1997 the Porsche 911 has gone through four major water-cooled generations that differ fundamentally in their weak-point profile. On top of these comes the world of the air-cooled cars before 1998 — mentioned briefly from a collector's perspective. Porsche 911 (Type 996, 1997-2005, M96 engine): The 996 was the first water-cooled 911 — a cultural break that split the purist community, but technically created a solid base. The weak point is the M96 flat-six engine with its IMS bearing (Intermediate Shaft Bearing): a rolling-element bearing in the centre of the engine that can break without warning when the bearing shell is worn. On top of this comes bore scoring in the cylinder bores — a problem whose cause lies in gaps in oil supply at a low oil level under cornering lateral acceleration. The combination of IMS and bore scoring makes the 996 the most demanding inspection object in the entire Porsche used market. Even so: a well-kept 996 with an IMS conversion (preventive replacement with a roller bearing) and good oil-history proof is an excellent car with an outstanding price/performance ratio. Porsche 911 (Type 997.1, 2004-2008, M96/M97 engine): The early 997 shares the M96/M97 flat-six with the 996 — and with it the IMS bearing problem. Early 997.1 engines have the same IMS risk as the 996; later 997.1 examples (from around 2006) had the bearing modified at the factory, but the risk persists. Bore scoring is a topic on the 997.1 with intake-manifold injection; the 3.8 DFI (direct injection, from the 997.2) has noticeably fewer problems. The 997.1 is a blueprint for the 'demanding but attainable' 911 purchase. Porsche 911 (Type 997.2, 2008-2012, MA1/direct injection engine): With the 997.2, the classic IMS bearing left the high-risk zone. The new DFI engine has a different drivetrain and less well-known bearing weaknesses. PDK was introduced — the mechatronics are a new inspection point. Bore scoring is less documented on the 997.2. The 997.2 is regarded as the 'sweet spot' of many 911 connoisseurs: plenty of sports-car DNA, a noticeably lower risk profile, still the classic 997 line. Porsche 911 (Type 991, 2011-2019): The 991 brought cylinder deactivation (VarioCam Plus), a turbo-engine option (Carrera S with turbo from the 991.2) and largely revised electronics. The IMS problem is history; the weak points shift to PDK mechatronics, turbo-connection topics and individual gearbox history. The 991 is the technically mature, modern, manageable 911 for buyers who are not looking for the collector's patina of a 996/997. Porsche 911 (Type 992, from 2019): As the youngest model, the lowest risk profile — but also the highest used prices. Here the focus is on accident history, OBD fault-memory integrity and service history. Track-day detection is relevant on the 992 too. Air-cooled 911 (up to Type 993, until 1998): The air-cooled series — 911 F, G, 964, 993 — are collector's items today with their own assessment criteria: bonnet panel gaps, originality, restoration history, rust spots in defined places. If you want to buy an air-cooled 911, you should indicate that during the booking process.
Porsche 911 weak points: what our inspection deliberately looks for
IMS bearing (intermediate shaft bearing) — 996 and 997.1
The intermediate shaft bearing — Intermediate Shaft Bearing, IMS for short — is the best-known and most expensive single weak point in the entire Porsche used market. In the M96 and M97 flat-six engine of the 996 (1997-2005) and the early 997.1 (2004-2008), this rolling-element bearing sits on the intermediate shaft in the rear of the engine. As it wears, the bearing race disintegrates into the oil circuit — metal particles circulate through the engine and lead to a total loss within a short time. The failure almost always comes without warning. Our inspector checks the engine oil for metallic debris, assesses the service history for a preventive IMS replacement, and provides a risk rating based on mileage and oil history.
Bore scoring — cylinder-bore wear in the flat-six
Bore scoring describes wear of the cylinder bores in the M96/M97 flat-six — triggered by gaps in oil supply that arise when the engine is run at a low oil level under high lateral acceleration. Porsche flat-six engines are more susceptible than inline engines, because the horizontal cylinder layout briefly leaves the oil pump without delivery in certain lateral-acceleration situations. The symptoms are subtle: minimally increased oil consumption, slight ticking on cold start, rough running. An endoscopic look into the cylinders is the gold standard — our inspector assesses the available indicators and recommends an endoscopy as the next step if the risk picture suggests it.
Service history and Porsche originality
On a Porsche 911, the service history is not an accessory but a value factor and safety indicator at the same time. Gaps in the service book, stamps from non-authorised businesses or missing workshop invoices are warning signs — especially on the 996/997.1, where proof of a preventive IMS replacement is decisive for the risk assessment. Originality of the vehicle numbers (VIN, type plate, engine identification) is a mandatory check on high-value 911 purchases. Our inspector compares mileage, service intervals and vehicle age for plausibility and documents every discrepancy.
Track-day detection — uncovering racetrack history
The Porsche 911 is the most popular track-day vehicle on German racetracks — the Nordschleife, Hockenheim, the Red Bull Ring. Track use is not automatically problematic if the vehicle was consistently serviced afterwards. It becomes problematic when it has been concealed and the wear left unaddressed. Our inspector searches deliberately: asymmetric tyre wear, scorched brake discs with characteristic heat zones, OBD entries for driving-dynamics system deactivations, traces of helmet rests or harness installations in the interior, remnants of taped number plates on the front end.
PDK mechatronics — 997.2 and later
With the 997.2 (2008), the PDK dual-clutch transmission entered the 911 — a highly sophisticated unit that depends on regular oil changes. Although Porsche officially spoke of a 'lifetime fill', experienced Porsche workshops recommend a change every 40,000 to 60,000 km with sporty use. Worn PDK mechatronics manifest as shift jerking, delayed take-off and gearbox-overheating warnings. Our inspector checks every gear range on the test drive and reads out the transmission control unit via OBD.
Clutch on the manual — wear and sporting use
The Porsche 911 with a six-speed manual has a clutch whose replacement, depending on model and workshop, costs several thousand euros. Vehicles used sportingly or on the racetrack wear the clutch out considerably faster than everyday cars. Our inspector checks the clutch engagement point, slip behaviour under load and acoustic anomalies when engaging gears — and compares the clutch behaviour with the details in the service history.
Brakes and PCCB — wear and racetrack detection
Porsche 911 models with the optional carbon-ceramic composite brakes (PCCB) are technically impressive, but extremely expensive when worn: a complete PCCB disc set reaches costs in the five-figure range. Glazed, cracked or unevenly worn ceramic discs are an immediate replacement case. Even steel brakes on sportingly used 911s show heat patterns, scoring and uneven pad wear as evidence of racetrack operation. Our inspector documents the condition of the brake discs and pads photographically at all four wheel wells.
Cooling system — 996 radiator clogging and thermostat
Unlike earlier air-cooled 911s, the water-cooled flat-six of the 996/997 depends on a functioning cooling system. The front water radiators of the 996 are prone to fouling from leaves and insects in the fin grille — with reduced cooling performance, the engine can hit its thermal protection under sporting operation. The thermostat and water pump are known wear parts. Our inspector checks the coolant level and quality, observes the temperature behaviour via OBD and visually inspects the radiator fronts.
Engine oil consumption — indicator for bore scoring and IMS
Increased oil consumption is an important early indicator on the M96/M97 flat-six — for incipient bore scoring as much as for advanced IMS wear. A healthy M96 consumes less than half a litre per 1,000 km; a vehicle that is noticeably topped up between inspections should be examined more closely. Our inspector records the current oil level, the oil colour and quality, and systematically asks about top-up needs between service intervals — often a more revealing piece of information than the fault memory.
Convertible top and interior — Cabrio and Targa
On the Porsche 911 Cabriolet and 911 Targa, the convertible-top mechanism and weather-tightness are inspection points in their own right. A faulty top — sticking, leaking, with a worn hydraulic cylinder — costs several thousand euros depending on the model. Air-conditioning compressors on rarely used sports cars can develop early sealing weaknesses through sporadic use. Our inspector checks the top mechanism, weather-tightness and the air conditioning for cooling performance and compressor operation.
Turbo topics — 991.2 Carrera and Turbo models
From the 991.2 Carrera (2016), standard turbo engines came to all 911 Carrera variants — a paradigm shift that brought new inspection points: turbocharger condition, charge-air piping for leaks, intercooler condition and the response of the turbo control. On the 911 Turbo and Turbo S of all generations, turbocharger condition is generally a mandatory inspection point. Our inspector reads out turbo-specific fault codes and assesses boost-pressure behaviour on the test drive.
Suspension, dampers and PASM — sporting-use wear
Porsche Active Suspension Management (PASM) is fitted from certain equipment levels — an active suspension that becomes costly if the actuator units fail. Dampers on sportingly used 911s show early wear at higher mileage, which makes itself felt in body movements and altered handling. Vehicles with a sports suspension or lowered ride heights should be checked for body grounding and damper leakage.
M96, M97, MA1, DFI, Turbo: which Porsche 911 engine suits your purchase goal?
Choosing the engine when buying a 911 is not just a question of model year — it defines the entire risk profile and determines where the inspection places its emphasis. M96 (996, 1997-2005): The M96 is the first water-cooled 911 flat-six — 3.4 or 3.6 litres, intake-manifold injection, 300-320 hp depending on the variant. Its risk profile is the highest of all 911 generations: the IMS bearing and bore scoring are real, expensive threats. An M96 without a documented preventive IMS replacement and with gaps in the service book is a high-risk vehicle. An M96 with an IMS roller-bearing upgrade, a short oil-change interval and a 911-experienced workshop in the service book, by contrast, is an excellent car at a price that reflects the 996's risk image. M97 (997.1, 2004-2008): The M97 is technically closely related to the M96 — the same IMS issue, but with modifications late in the production run. Early 997.1 units (up to around 2006) have the same IMS risk as the 996; from around 2007 the bearing was modified at the factory. Bore scoring is also a topic on the M97, especially on vehicles with poor low-oil-level management. The M97 Carrera S (3.8 litres) is considered the more emotional engine; the 3.6 the more easygoing one. MA1 / DFI (997.2, 2008-2012): The 997.2 brought direct injection — a technological leap that dramatically reduced bore scoring. The IMS bearing in its critical form is no longer fitted. The PDK gearbox was introduced. For many, the 997.2 offers the best price/performance/risk ratio in the entire 911 market. 991 generations (2011-2019): Largely revised flat-six engines, no IMS issue, the first standard turbocharging from the 991.2 Carrera. A noticeably better reliability image. Weak points are model-specific (turbo bearings, PDK) and far less often structural. 992 (from 2019): The latest generation, the lowest risk profile, the highest prices. Here the focus of the inspection is on accident history, fault-memory integrity and track use.
Porsche 911 used market price: what determines the value of a 911?
The used market for the Porsche 911 is one of the most liquid and at the same time most error-prone sports-car markets in Germany — with enormous spread depending on generation, condition, documentation and optional equipment. 996 (1997-2005): For a long time, the 996 was under price pressure because of its IMS image. Well-documented, IMS-rectified examples with a roller-bearing upgrade now once again achieve prices that match their actual condition level. A 996 without IMS proof and with a patchy service book trades considerably cheaper than a comparable rectified example. The price/risk ratio is therefore most pronounced on the 996. 997.1 (2004-2008): Strong on price, strongly in demand. The spread between patchily and fully documented examples is considerable — a 997.1 with IMS proof, a short oil-change interval and Porsche-workshop stamps is worth substantially more than an identical vehicle without that documentation. 997.2 (2008-2012): The market recognises the better risk profile of the 997.2 — prices are correspondingly higher than on the 997.1. The PDK vs. manual ratio affects value: connoisseurs pay a premium for rare manual examples. 991 and 992: Price correlates strongly with mileage, optional equipment and service history. Turbo and GTS command substantial premiums; accident vehicles suffer larger deductions than the average car. In every case the rule holds: a detailed inspection report — especially in the Premium package with a market-price classification — gives you a well-founded negotiating basis that, when buying a 911, can make a difference of several thousand euros.
How your Porsche 911 inspection works
Book online — in five minutes
Tell us the vehicle location (postcode) and the listing link. Travel is included in the fixed price — no hidden costs. No phone call needed.
Inspector drives to the 911 — about 1.5 hours
An experienced vehicle appraiser from our Germany-wide network arranges the appointment directly with the seller. They inspect your prospective 911 on-site for about 1.5 hours: cold-start listening (IMS, valvetrain), OBD readout of all control units, paint-thickness measurement, track-day indicators, suspension, clutch or PDK test drive and service-history assessment. You don't have to be present.
Digital report within 24 hours
You receive the full inspection report by email: paint-thickness heatmap, OBD findings explained, photos of every anomaly, IMS risk assessment, a track-day indicator summary and an overall rating per category. Clearly structured, plainly worded — ready to use in price negotiations.
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
Porsche 911 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 moreMore Porsche models
Porsche Cayenne
Weak points & inspection for the Porsche Cayenne.
Learn morePorsche Macan
Weak points & inspection for the Porsche Macan.
Learn morePorsche Panamera
Weak points & inspection for the Porsche Panamera.
Learn morePorsche Boxster
Weak points & inspection for the Porsche Boxster.
Learn morePorsche Cayman
Weak points & inspection for the Porsche Cayman.
Learn moreFrequently asked questions about the Porsche 911 inspection
The IMS bearing — Intermediate Shaft Bearing — is a rolling-element bearing in the rear section of the M96 and M97 flat-six engine fitted to the Porsche 911 Type 996 (1997-2005) and 997.1 (2004-2008). This bearing sits on the intermediate shaft that drives the camshaft timing. As it wears — accelerated by long oil-change intervals, the wrong oil grade or high mileage without a preventive replacement — the bearing race breaks apart and sends metal fragments into the oil circuit. The result is usually an economic total loss of the engine, because the metal debris damages every bearing surface in the engine within a short time. The failure almost always comes without warning. Our inspector assesses the engine oil for debris, the service history for an IMS replacement, and provides a risk rating by model year and mileage.
Buy your Porsche 911 on facts, not gut feeling.
IMS bearing failure, bore scoring, undisclosed track use — the most expensive problems when buying a 911 are invisible. Our inspection gives you the facts. From 289 euros incl. VAT and travel.