Used Porsche 911 991 Gen (2012-2019): Buyer's Guide

Rennlist has a single forum thread on 991.1 bore scoring with owners posting failure mileages as low as 16,000 miles. Same generation, same basic 911 shape as the car that replaced it, and a real engine risk that mostly disappeared the moment Porsche switched to turbocharging in 2017. That's the whole story of the 991: two very different ownership experiences wearing one chassis code.

This guide splits the 991 by sub-generation and by engine, because that's how the risk actually breaks down. A 2015 Carrera S and a 2018 Carrera S share a name, a silhouette, and almost nothing else under the engine cover.

This Generation at a Glance

The 991 is the seventh generation of the 911, an entirely new platform (only the third since 1963) that replaced the 997 for the 2012 model year. It splits cleanly into two phases. The 991.1 (2012-2016) runs naturally aspirated flat-six engines: a 3.4L in the base Carrera, a 3.8L in the Carrera S. The 991.2 (2017-2019) is the mid-cycle overhaul that turbocharged the entire Carrera range down to a 3.0L twin-turbo six, while the GT3 and GT3 RS stayed naturally aspirated throughout. Porsche's infotainment also jumped from PCM 3.1 to PCM 4.0 (with CarPlay) as part of the 991.2 switch, a real daily-usability difference that has nothing to do with the engine.

Current pricing and inventory: Porsche 911 market data, with per-year pages for 2014, 2015, 2017, 2018, and 2019.

Powertrain & Trim Breakdown

991.1 Carrera and Carrera S, naturally aspirated (2012-2016)

This is the engine the bore scoring conversation is about. The 9A1/MA1 flat-six (3.4L in Carrera, 3.8L in Carrera S) uses direct injection with tight factory piston-to-bore clearances, and Rennlist's dedicated bore scoring thread, LN Engineering's technical writeups, and a Porsche Club of America article all treat it as a real, named risk rather than internet noise. Forum consensus points at the 3.8L Carrera S as more affected than the 3.4L base engine. Proposed causes include cold-start clearance stress, thin factory-spec 0W-40 oil combined with long OEM drain intervals, and in some documented cases faulty fuel injectors damaging a cylinder wall directly. Reported failure mileages start as low as 16,000 to 18,000 miles. Symptoms are consistent across sources: a ticking or knocking noise, rising oil consumption, misfires, and fouled spark plugs or oxygen sensors. Whether Porsche's warranty covers a given case is inconsistent; some owners got a CPO-covered engine replacement, others paid out of pocket after the warranty lapsed. There is no confirmed blanket factory campaign for bore scoring specifically, so budget for the possibility rather than expecting coverage. Porsche's real fix arrived with the 991.2: a plasma-transfer wire arc (PTWA) cylinder coating that replaced the older Alusil block lining starting in the 2017 model year.

The good news: the IMS bearing, the failure mode that defines older water-cooled 911 shopping, does not exist on this engine at all. It was eliminated with the 9A1 architecture back in the 2009-model-year 997.2, and the 991 carries that forward. If a seller or a forum post brings up IMS risk on a 991, that's a mismatched conversation from an earlier generation.

A separate, lower-stakes 991.1 quirk: the plastic coolant housings use rubber hoses clamped to an aluminum insert bonded in with adhesive, and that bond degrades with heat cycles, producing a slow coolant leak at the hose union rather than a catastrophic failure. Porsche's updated part uses a screw-in insert instead of a glued one. It's an easy PPI check: look for coolant staining near hose unions under the car.

991.1 Turbo, Turbo S, GT3, and GT3 RS (2013-2016)

The Turbo and Turbo S run a 3.8L twin-turbo six shared with the GT3 lineage rather than the Carrera's naturally aspirated engine, and neither the bore scoring pattern nor IMS risk applies here. PDK is the only gearbox offered on Turbo, Turbo S, GT3, and GT3 RS in this phase; the manual didn't return to the GT3 until the 991.2 refresh. The single biggest documented issue for this window is narrow in scope but serious: NHTSA campaign 14V090000 covers 209 units of the 2014 model-year GT3 built between October 19, 2013, and January 16, 2014. A piston connecting rod bolt could loosen, damage the crankcase, and leak oil onto hot engine components with a real fire risk; Porsche told owners not to drive affected cars and replaced the entire engine free of charge. That recall is specific to that narrow build window on the GT3, not the broader Carrera or Turbo lineup. Beyond that, PDK reliability across this whole naturally-aspirated-and-Turbo group is reported as strong by Rennlist long-running threads, with failures concentrated in the hydraulic control section and sensors rather than the clutch packs, and cited failure rates under 1% before 100,000 miles. When PDK does fail, dealers typically default to a full remanufactured unit rather than a repair, with owner-reported quotes around $20,000.

991.2 Carrera, Carrera S, and GTS, turbocharged (2017-2019)

The headline change: every Carrera-line 991.2 gets a 3.0L twin-turbo flat-six instead of the old naturally aspirated engines, with the GTS trim tuned to roughly 450 hp. Forum threads on 911uk, PistonHeads, and Rennlist repeatedly point at the factory turbo oil-feed line as a real weak point on these engines, with reported symptoms of white smoke on cold start from oil pooling in the turbo housing, and outright turbo failure in some cases (one reported at roughly 7,000 miles). Porsche's fix is a redesigned oil-feed line installed at the time of turbo replacement rather than a proactive recall. Sentiment in the same threads is mixed rather than universal: plenty of owners report trouble-free turbo Carreras, and the failure pattern is discussed mostly on the Carrera/Carrera S/GTS line rather than the Turbo model. On carbon buildup, the 9A1 direct-injection design sprays fuel to help wash the intake valve backside, and forum and mechanic reports (including one 35,000-mile inspection that found none) suggest it's less severe here than on some rival turbo engines, though walnut blasting is still the standard remedy when it shows up. A separate coolant/water-pump issue affected some 2017-2018-built cars at the plastic pipe-to-pump-housing joint; Porsche responded by extending the water pump warranty to 10 years in North America for affected builds. PDK in this generation carries the same strong reputation as 991.1, and the widely reported "clunk" on a 2-1 downshift is normal DCT behavior, not a fault, according to owner and dealer accounts.

991.2 Turbo, Turbo S, GT3, GT3 RS, GT2 RS, and Speedster (2017-2019)

The Turbo and Turbo S carry over a version of the 3.8L twin-turbo six, now making 540-580 hp, and share the same water-pump coolant concern as the Carrera line on 2017-2018 builds. The 991.2 GT3 (2018-2019) brought back a manual gearbox alongside PDK, a genuine change from the 991.1 GT3's PDK-only setup, and Rennlist's GT3-specific thread reports no repeat of the 991.1 GT3's connecting-rod issue, with only minor complaints like an oil tank pipe leak and loose exhaust valve tubing. Track use can trigger a PDK over-temperature fault if clutch fluid runs past spec on these cars, which owners describe as an expected limit rather than a defect. The GT2 RS (2018-2019) is the most powerful 911 built to that point at roughly 690 hp from a twin-turbo 3.8L, with no non-RS GT2 offered in this generation; public ownership data on it is thin simply because so few exist, so lean on a specialist PPI over forum research for this specific trim. The 2019 Speedster, based on GT3.2 architecture, closed out the 991 as a limited-run open-top halo car.

Targa 4 and Targa 4S, both phases

The Targa's retractable roof mechanism, a full fabric-and-glass assembly that stows behind the rear seats, is its own inspection category regardless of engine. Check that the roof cycles smoothly through a full open-and-close operation during any test drive and listen for grinding or hesitation. Because the Targa is always all-wheel drive and shares its engine with the equivalent Carrera 4 or 4S of the same phase, every mechanical item covered above for the 991.1 or 991.2 Carrera applies here too. The extra weight and complexity of the roof mechanism adds one more moving system to a PPI that a standard coupe or cabriolet doesn't have.

GT3 versus GT3 RS: what the extra cost actually buys

Owners comparing the two on Rennlist consistently frame the RS as a track-focused evolution rather than simply a more powerful GT3: wider bodywork, more aggressive aero, a fixed rear wing over the GT3's active one, and, on 991.2 cars, PDK-only versus the GT3's choice of manual or PDK. The RS commands a real resale premium tied to that track focus and lower production numbers, so buyers cross-shopping the two should weigh how much of the RS's added capability they'll actually use on the street.

Trim Levels

The Sport Chrono package is worth having on almost any trim: it sharpens throttle response and PDK shift speed and adds a lap timer. Rear-axle steering, standard or optional depending on trim and year, gets an explicit "if it's offered, get it" endorsement from Porsche Club of America's own tech-tip content, with the caveat from owner threads that its benefit is most obvious at a spirited driving pace rather than daily commuting. PDCC (Porsche Dynamic Chassis Control) is more contested: several owner threads describe it as less pleasant to live with on rough street pavement than the base suspension, so treat it as discretionary rather than a must-have.

PCCB ceramic brakes, standard on Turbo models and optional elsewhere, are the single biggest trim-specific cost risk in this lineup. Owner-reported replacement quotes range from roughly $8,000 for a refurbished set to $14,000-$26,000 for full new rotors, and cracking is a documented risk if a previous owner ran non-Porsche-spec pads against the discs. Any PCCB-equipped car needs those discs inspected before you agree on a price, full stop.

Which Model Years to Target Within This Gen

The 2014 GT3-only connecting rod recall (campaign 14V090000) applies strictly to 209 cars built between October 19, 2013, and January 16, 2014, not the broader Carrera or Turbo line that year. The 2016-2017 airbag ECU capacitor recall (19V533000) is the largest by volume in this generation at roughly 7,500 units. None of the other campaigns clear even a few hundred vehicles, so treat every recall in this table as a VIN-specific check rather than a reason to avoid a whole model year.

Pre-Purchase Inspection Checklist

For any 991.1 Carrera or Carrera S: get a borescope inspection of all six cylinders for bore scoring, ideally alongside a used-oil analysis for elevated wear metals. Listen for a ticking or knocking noise at cold start and check for oil consumption beyond what the seller discloses.

For any 991.1 Turbo, GT3, or GT3 RS: confirm whether the car falls inside the connecting rod recall build window (October 19, 2013 through January 16, 2014) and, if so, verify the engine was replaced. Ask if the transmission recall or any other open campaign was completed; run the VIN through the recall lookup tool rather than taking a seller's word for it.

For any 991.2 Carrera, Carrera S, or GTS: check for white smoke at cold start, a sign of oil pooling in the turbo housing that forum reports tie to the factory oil-feed line design. Inspect for coolant seepage at the water pump housing on 2017-2018-built cars specifically.

For any PDK car regardless of generation: pull the transmission's fault code history and confirm current software, and ask for PDK service records; a full remanufactured unit runs around $20,000 if it fails outside warranty.

For any PCCB-equipped car: inspect the ceramic discs directly for cracking, and ask what brake pads have been run against them.

For every 911 in this generation: review the DME over-rev report via a Porsche-capable scan tool to check for money-shifting, and confirm the car's full Porsche service history rather than relying on a general mechanical inspection alone.

Running Costs

PDK fluid and filter service runs roughly $850 to $1,900 at an independent shop; a full clutch pack replacement, when needed, runs $3,000 to $6,000. PCCB replacement, covered above under trim levels, is the standout expensive-repair category on ceramic-brake cars. Insurance for the 911 as a nameplate sits in the pricier quartile of vehicles to cover, with reported full-coverage ranges roughly $3,500 to $5,200 a year depending heavily on trim, location, and driver history; a Turbo S costs meaningfully more to insure than a base Carrera. Staggered tire setups, wider in the rear across every 991 trim, are a real recurring cost that a typical daily driver doesn't carry, and dealer service for routine work commonly runs several times what an independent Porsche specialist charges for the same job.

Every engine in this generation, naturally aspirated or turbocharged, requires premium fuel; running lower octane isn't a real cost-saving option. Non-PCCB cars use conventional iron brake rotors that run a fraction of PCCB replacement cost, another reason a buyer priced out of the ceramic-brake repair scenario might specifically seek out a car without that option. Independent Porsche specialists, rather than the dealer network, are where most of the maintenance-cost figures above come from; a dealer quote for the same service commonly runs 30 to 50 percent higher.

FAQ

Is the 991 Porsche 911 reliable? It depends on which sub-generation. The 991.1's naturally aspirated engines carry a documented bore scoring risk, most reported on the 3.8L Carrera S. The 991.2's turbocharged engines trade that risk for a different one: reported turbo oil-feed issues on some Carrera-line cars.

What year 991 911 should I avoid? No year is a hard pass, but 2012-2013 cars have thin used-market data on this site, and any 991.1 Carrera or Carrera S deserves a borescope inspection regardless of year given the documented bore scoring pattern.

Is the 991.1 or 991.2 a better buy? The 991.2 fixed bore scoring with a new cylinder coating and added power via turbocharging, but introduced its own reported turbo oil-feed concern. The 991.1 costs less to buy and keeps the naturally aspirated engine character many owners prefer, at the cost of a real, documented engine risk that needs checking before purchase.

Does the 991 911 have IMS bearing problems? No. The IMS bearing was eliminated starting with the 9A1 engine architecture in the 2009-model-year 997.2 and never returned. Every 991, in both phases, is free of this specific failure mode.

How many miles does a 991 911 last? Well-maintained examples with clean service records and no bore scoring symptoms regularly reach well past 100,000 miles. Service history and a PPI matter far more for this generation than the odometer reading alone.

Bottom Line

Get a borescope inspection and oil analysis on any 991.1 Carrera or Carrera S before you buy, and check turbo oil-feed history on any 991.2 Carrera-line car. The 2018-2019 window is the strongest overall pick in this generation: mature 991.2 turbo engines, a returned manual GT3 option, and no bore scoring exposure at all. Run every VIN through the recall lookup tool before you commit, and check the 911 market data for a sense of where current pricing sits. CarScout members can set a scout on a specific 991 trim and year range and get a daily email the moment a matching listing shows up.

Data sourced from NHTSA recall campaigns 14V090000, 14V698000, 16V946000, 17V134000, 17V135000, 19V533000, 19V179000, and 21V201000, EPA fuel economy data, and owner experience compiled from Rennlist, 911uk.com, PistonHeads, Porsche Club of America, and LN Engineering's technical guides.