2009 Porsche Boxster S Problems

RepairPal has identified the most common problems with the 2009 Porsche Boxster S as reported by actual vehicle owners. We'll tell you what the problem is and what it'll take to fix it.

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Known Problems

The drains in the Cabriolet top can clog, causing water to leak onto the carpets. Water can also accumulate in the doors, causing various electrical problems.

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

Engine vacuum leaks can develop from various locations resulting in illumination of the Check Engine Light.

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

Persistent coolant loss can be caused by a small leak at the coolant reservoir. Our technicians tell us the leak may not be visible due to the trunk carpet hiding the leak.

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


If the vehicle cannot return to run position after start or if the interior fan is not getting power, it may be the electrical portion of the ignition switch has become erratic or has failed. The entire switch assembly should be replaced.

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.

Electrical issues—windows lowering after locking or leaving the vehicle—can be caused by a defect in the window motors.

Depending on driving habits, brake pad and rotor wear can be excessive. Our technicians recommend regular brake inspection to avoid having the pads wear out and damage the rotors. 

Abnormal noise may be noted when shifting or reverse gear is selected in vehicles with a manual transmission. If this problem is encountered, proper operation of shift cables and clutch should be verified before any other repairs are attempted.

If the airbag warning light illuminates, it must be attended to quickly. Seat belt buckles, wiring updates/repairs, and airbag module faults may be the cause.

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

The power windows not lowering when the Cabriolet top latch and/or door handle is operated or lowering unexpectedly while driving can be caused by a failing Cabriolet top or door handle micro switch. Diagnoses will be required to determine which switch is at fault and will require replacement.

Windows and interior trim can be prone to squeaks and rattles. Numerous, small adjustments may resolve the issue. Additional creaks have been attributed to front and/or rear window fit as well.