If you are considering buying a used Porsche Cayman, there are several major reliability issues worth knowing about first. Our garage database tracks 2 known faults for this model, 2 of them rated high severity. Every one below is a repair bill a seller has good reason not to mention.
Found a Porsche Cayman for sale?
Paste the advert and we read it against its known faults, its MOT history and the DVLA record, and tell you what the seller has not. Free, about a minute, no card.
Check a Porsche Cayman advert (free) →One owner each, in their own words rewritten as a line, and not counted in our risk scoring. A fault joins the list above once a second report or an editorial source backs it.
Sellers rarely admit these faults outright
We track 4 specific phrases sellers use in adverts to soft-pedal these exact issues. Paste any Porsche Cayman advert and we check it in seconds.
Check an advert now (free) →An overdue cambelt is the most expensive thing a seller can fail to mention on a used Cayman. These are the figures UK specialists work to.
The M96/M97 engines use timing chains. However, the far bigger concern is the Intermediate Shaft (IMS) bearing which drives the chains. This bearing can fail catastrophically and should be proactively upgraded.
Always confirm against the vehicle handbook. Intervals vary by engine, and several manufacturers revised theirs after failures in service.
The Porsche Cayman has 2 known faults in our database, 2 of them rated high severity. The most serious are engine (intermediate Shaft (IMS) bearing failure causing catastrophic engine destruction without) and engine (cylinder bore scoring causing piston slap, high oil consumption). None of them makes the car a bad buy on its own; the risk is a seller who knows and says nothing.
No Porsche Cayman year is a write-off, but the 996 / 986 / Early 997 / Early 987 (1998 to 2008) carries the most serious faults: engine. Year matters less than whether the specific car has had the known fixes, so check the history for them.
Ask the seller about the engine faults on this page and whether they have been fixed, with invoices. On the test drive watch for metallic debris in the oil filter during servicing and ticking or tapping noise from the engine (piston slap). Read the MOT history for repeat advisories, then paste the advert into the free check, which reads it against its known faults before you travel. Check a Porsche Cayman advert →
Owners report 27.6 mpg on average across the Porsche Cayman engines with data, about 91% of the official combined figure. The gap between official and real-world economy varies a lot by engine, so the Real MPG page lists every engine and generation separately, from 115 owner submissions. Porsche Cayman Real MPG by engine →
Looking at a Porsche Cayman right now? Check the advert before you go and see it.
If you used to check the Honest John “Good & Bad” section before the site closed in 2026, this page is where that information now lives. We rebuilt the Porsche Cayman owner-report history from the archived Honest John dataset, added our own research, specialist and owner-club sources and DVSA recall data, and we keep it free. Each fault above is badged with its source. The same data feeds our free advert check, which reads a listing against every known fault for the exact engine and year.
CarAdCheck is not affiliated with Honest John or Volkswagen Financial Services. What happened to Honest John, and where each feature lives now.
Knowing what a Porsche Cayman goes wrong with is half of it. The rest is reading the advert and checking the car's history before you hand any money over.