1974 - 1977
911 & 911S
- Prone to oil leakage
- Cylinder head studs pulling out of the engine case
- Cylinder head studs breaking
- Timing chain tensioner failures
- Transmission synchronizers wearing out causing poor shifting
- Shifter bushings wearing out
- Fuel injection components wear out causing poor starting
- Prone to rust damage
1978 - 1983
911 SC
- Cylinder head studs breaking
- Timing chain tensioner failure
- Prone to oil leakage
- Fuel injection components wear causing poor starting
- Air conditioning system work poorly
- Rust damage in the battery area
- Fuel injection air box failure
- Suspension bushings wearing out
1984 - 1989
Carrera
- DME (engine control unit) relay failure
- Replacement of cylinder head temperature sending unit with single wire
- External oil lines to the front mount cooler being crushed
- External oil lines leaking
1989 - 1994
Porsche 964
- Prone to oil leakage
- The AC system lacks a filter, causing the evaporator to become clogged with debris
- External oil lines leaking
- Rust under the windshield on the cowl
- The most expensive Porsche 911 to service
- Air bag system
- Battery draw problems
- Cabriolet top drive cable and motors
- Four wheel drive components
- Fuel lines on the engine
- Power steering lines and steering rack
1995 - 1998
Porsche 993
- Check engine light malfunction
- The air injection ports become clogged with carbon
- Power steering lines and steering rack
- External oil lines leak oil
- Cabriolet drive cables and motors
- Power seat switches
1996 - 1997
Porsche 993 Turbo
- Problems with the scavenge pump oil lines
- Smoking on startup
- Steering rack leaking
- External oil lines leaking
- Engine oil leaks
1999 - 2005
Porsche 996
- Water pump leakage
- Intermediate Shaft failure (IMS failure)
- Door window dip feature issues
- Coolant reservoir leakage
- Serpentine belt, tensioner, and pulley issues after 60,000 miles
- Ignition switch failure
- Air-oil separator problems
- Starter and starter cable. Transmission mounts. Ignition coils.
2001 - 2005
Porsche 996 Turbo
- Coolant pipe failure
- 6-speed transmission pops out of second gear under deceleration at low RPMs
- The hydraulic rams on the rear wing prone to leakage
- Coolant reservoir leakage
- Clutch pressure accumulator
- Boost diverter valves fail
- Serpentine belt and pulley issues after 60,000 miles
- Transmission mount problems
- Water pump leakage
2005 - 2013
Porsche 997
- Prone to intermediate shaft failure (IMS failure)
- Water pump leakage
- Starter and starter cable problems
- Serpentine belt and pulley issues after 60,000 plus miles
- Coolant reservoir leakage
- Driver and passenger side window dip feature issues
- Ignition coils problems
- Air-oil separator problems
2007-2013
Porsche 997 Turbo
- Coolant pipe failure
- Water pump leakage
- Rear wing hydraulic ram problems
- Coolant reservoir leakage
- Carbon fiber interior parts delaminating