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Porsche 911 Problems

RepairPal has identified the most common problems with the Porsche 911 based on complaints from actual vehicle owners. We'll tell you what the problem is and what it'll take to fix it.

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50
Known Problems

The constant velocity (CV) boots and CV joints should be inspected at each service. Servicing the torn CV boots early can prevent the need to replace the CV half shaft or CV joint.

Over time, the engine can leak oil at various locations. Early-production vehicles require engine disassembly and modification to resolve leaks at the cylinder heads, oil return tubes, valve covers, timing cover, chain housings, case through bolts, and lines to/from the oil cooler.

Cam tensioner/cam timing issues can cause the Check Engine Light to illuminate.

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.

The accumulation of moisture at major connectors and control units can cause various ABS/PDAS faults due to corrosion.

Smoke, oil consumption, and fuel trim issues with various fault codes can be traced to an internal leak at the oil separator.

Valve cover leaks are common.

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 dimensional accuracy of the crankshaft to engine block.

A failing mass air flow sensor or EVAP purge valve can cause misfire issues.

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 coolant fill procedure must be followed when refiling the cooling system.

Various fuel trim and oxygen sensor limit fault codes can be traced to an internal vacuum leak at the oil separator.

 

The release mechanism for the clutch (including the release arm bearings and shaft) can fail and cause stiff, binding, and possibly noisy pedal operation.
The clutch release on early-production vehicles requires modification to make it compatible with newer repair parts.
The hydraulic fluid for the clutch system may be overlooked; the fluid should be replaced regularly during brake fluid service.