Porsche 991 Years To Avoid PORSCHE 911 Coupe (991) (12.2011 - ...)

In fact, the Porsche 991 does not have any widely known "bad" years of production, it is a very reliable model.
Nuances by phases:
991.1 (2012-2016) with naturally aspirated engines: Generally reliable. Occasionally - cooling valve failures, water pump wear, minor electrical "glitches". (Engine problems with the GT3 991.1 do not affect regular Carrera).
991.2 (2017-2019) with turbocharged engines: Also very reliable. Less often - exhaust noise, theoretical problems with turbos with huge mileage.
Main advice: Instead of the year, look at the full service history and be sure to conduct a pre-purchase inspection with a Porsche specialist.

For the Porsche 991 (model years 2012–2016 for the 991.1 and 2016–2019 for the 991.2), here’s what you should know about which years or versions to be cautious about and general advice:

Years and Models to Be Wary Of
- The earlier 991.1 models (2012–2014) can have some issues such as faulty crank sensors, coil pack failures causing misfires or engine cut-outs, and stuck or corroded valves in the optional sports exhaust system. Cooling system sensors and valves may also cause warning lights.
- Some 991.1 cars have had problems with the belt tensioner, which is hydraulic and can leak and fail over time, affecting accessories like the alternator and power steering.
- Suspension components like worn bushes, top mounts, and leaking dampers are common wear items to check on 991.1 models.
- Brake rotors, especially the drilled ones on 991 models, can develop cracks between holes, which is a safety concern and costly to fix.
- Porsche Ceramic Composite Brakes (PCCB), an option on S, Turbo, and GT models, can be extremely expensive to replace if worn.

More Reliable Years and Versions
- The 2015 and 2016 991.1 models are generally considered safer and more trouble-free compared to earlier 991.1 years.
- The 991.2 models (2016–2019) are regarded as fairly reliable overall, with fewer major issues reported. Some owners have had minor electrical gremlins mostly related to battery wear.
- Regular maintenance and thorough service history are crucial. Porsche recommends servicing every two years or 20,000 miles for 991.1, though many owners prefer more frequent oil changes for peace of mind.

Important Buying Tips
- Get a full pre-purchase inspection (PPI) including checking the ECU for hidden fault codes and over-rev history (especially for manual gearbox cars).
- Check for any accident damage or poor repairs, including panel alignment and underbody condition.
-Verify the service history is comprehensive and done by a Porsche dealer or a reputable specialist familiar with 991s.

- Pay attention to wear items like suspension bushes, brake discs and pads, and clutch condition if manual.
- If the car has PCCB brakes, confirm the remaining life carefully due to high replacement costs.

Avoid the earliest 991.1 models (2012–2014) if possible, or ensure they have been thoroughly maintained and checked for common faults like coil packs, belt tensioners, and suspension wear. The 2015 and 2016 991.1 and all 991.2 models are generally more reliable choices. Always insist on a detailed service history and a professional inspection before purchase.

This approach will help you enjoy the Porsche 991 with fewer surprises and costly repairs.