Porsche 911 Problem Reports
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Various fuel trim and oxygen sensor limit fault codes can be traced to an internal vacuum leak at the oil separator.
The front hood and rear deck lid support struts may fail; replacement is required.
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 low stored hydraulic pressure due to a failed high pressure accumulator.
An external fluid leak may develop at the pressure switch; fluid will be evident in the trunk and the reservoir level will drop.
The ignition distributor's internal drive belt can fail and cause misfires and performance problems. After being updated, the distributor belt requires regular inspection.
If the engine won't turn over or cuts out at seemingly random times, it may be a failing relay for the DME system.
If engine misfiring, rough running, or fuel consumption issues are not resolved quickly, the catalytic converter can overheat and fail.
Fluid leaks at the right rear corner can often be traced to the radial seal at the power steering pump.
Various repairs and adjustments to the drive mechanism (including cables) are commonly needed on the Cabriolet tops.
The hydraulic pump relay can fail, causing the pump to run continuously, which leads to hydraulic pump failure due to overheating. Incorrect pressures will cause a low brake pedal or a high pedal effort with the possibility of other strange symptoms.
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. Aged brake fluid can cause numerous problems, including "waxy" buildup visible in the reservoir, so replace the brake fluid regularly. Special procedures are required to bleed/flush ABS pump.
Engine issues related to valve guide wear are common. Oil consumption, smoking at first startup, and valve train noise are all symptomatic of loose guides and worn valve stems. The valve train is complex and should be thoroughly inspected if a problem arises.
Pay close attention to secondary ignition system components (distributor caps, rotors, cables, and connectors).
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.
A failing cylinder head temperature sensor can cause erratic running or the engine to cut out entirely.