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Porsche 911 Problems

Find the most common issues based on Porsche 911 owner complaints.
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Most Common Porsche 911 Problems

Smoke, oil consumption, and fuel trim issues with various fault codes can be traced to an internal leak at the oil separator.
A small leak in the coolant reservoir can cause persistent coolant loss. To ensure engine longevity, coolant loss and overheating issues need to be resolved. Out technicians tell us the proper ...
Engine oil leaks can occur at the rear main seal and/or intermediate support cover o-ring; a revised seal is available. A careful diagnosis with proper tools is necessary to verify dimensiona...
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6 Known Porsche 911 Brakes Problems

Pay close attention to warning lights and have the brakes inspected regularly—immediately address any brake problems. Hard driving habits will cause excessive brake pad and rotor wear.
The accumulation of moisture at major connectors and control units can cause various ABS/PDAS faults due to corrosion.
The brake warning display and warning gong can activate, typically after the first start of the day. The warning light/gong might stop after idling for a short time. This fault is usually caused by...

10 Known Porsche 911 Drive Train Problems

An internal transmission problem can cause difficulty engaging or downshifting from second gear. Improved parts are available as of the 1997 model year.
Ring and pinion failure can occur on 4WD versions.
The spur gear drive area is prone to leaks; the seals/gaskets can be replaced without removing the transmission.

4 Known Porsche 911 Electrical & Lights Problems

The vehicle central warning display can be sensitive to interference from vehicle ignition faults such as high voltage arcing anywhere in system. Battery capacity must be adequate to avoid electric...
A normal operating clock may cause the airbag warning lamp to illuminate or a chronic dead battery.
Using the wrong battery or the failure of a climate control module may cause a chronic dead battery after the vehicle has not been used for a while.

16 Known Porsche 911 Engine Problems

Smoke, oil consumption, and fuel trim issues with various fault codes can be traced to an internal leak at the oil separator.
Engine oil leaks can occur at the rear main seal and/or intermediate support cover o-ring; a revised seal is available. A careful diagnosis with proper tools is necessary to verify dimensiona...
A small leak in the coolant reservoir can cause persistent coolant loss. To ensure engine longevity, coolant loss and overheating issues need to be resolved. Out technicians tell us the proper ...

5 Known Porsche 911 Exhaust & Emissions Problems

Due to air leaks at various locations, the Check Engine Light may illuminate.
Check Engine Light illumination and performance issues can be caused by oxygen sensor faults.
Various fuel trim and oxygen sensor limit fault codes can be traced to an internal vacuum leak at the oil separator.

1 Known Porsche 911 Heating & Air Conditioning Problem

Climate control modules can be problematic. Symptoms vary but include failure or persistent dead battery after not using the vehicle for a while.

0 Known Porsche 911 Maintenance Problems

4 Known Porsche 911 Miscellaneous Problems

The front hood and rear deck lid support struts may fail; replacement is required.
Wind noise at the front of the car and water leaks at the vent wing are typical problems on Targa models.
Creaking noises while driving over bumps and when cornering may be difficult to diagnose, but are usually caused by the windshield at the body/seal area. The latest version seal and/or lubricant ca...

4 Known Porsche 911 Suspension & Steering Problems

Fluid leaks at the right rear corner can often be traced to the radial seal at the power steering pump.
In order to avoid ABS, Tiptronic, or intermediate differential faults/warning lights, correct tire profile and wear must be maintained.
The front control arms should be regularly inspected for wear at the ball joints and bushings. Ball joint boot cracks/tears can lead to ball joint wear and failure.

50
Known Porsche 911 Problems & Complaints

Wind noise at the front of the car and water leaks at the vent wing are typical problems on Targa models.
Issues with the air flow meter flap or calibration can cause fuel mixture control problems.
Moisture accumulation within instruments can be traced to small leaks at the windshield and can usually be resolved without removing the glass.
The vehicle central warning display can be sensitive to interference from vehicle ignition faults such as high voltage arcing anywhere in system. Battery capacity must be adequate to avoid electric...
Using the wrong battery or the failure of a climate control module may cause a chronic dead battery after the vehicle has not been used for a while.
The spur gear drive area is prone to leaks; the seals/gaskets can be replaced without removing the transmission.
The hydraulic components for the clutch release mechanism at the clutch pedal can fail and cause a low, limp pedal feel.
Tire wear (especially in the rear tires) can be rapid and handling will suffer if the problem is not addressed.
Fluid leaks at the right rear corner can often be traced to the radial seal at the power steering pump.
The front control arms should be regularly inspected for wear at the ball joints and bushings. Ball joint boot cracks/tears can lead to ball joint wear and failure.
In order to avoid ABS, Tiptronic, or intermediate differential faults/warning lights, correct tire profile and wear must be maintained.
A failing cylinder head temperature sensor can cause erratic running or the engine to cut out entirely.
If the engine won't turn over or cuts out at seemingly random times, it may be a failing relay for the DME system.
In early models, the alternator/fan belts and bearing at the pulley must be correct. Updated parts are required for the alternator/fan pulley, as well as the belt tension monitor.
Pay close attention to secondary ignition system components (distributor caps, rotors, cables, and connectors).
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