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- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT2 2007-09
Ignition Coil Set
Restore the performance and reliability of your Porsche
997.1 Turbo or GT2 with this Genuine Porsche Ignition Coil Set, containing the
correct factory combination of five standard ignition coils and one
shorter-profile ignition coil
Fits:
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT2 2007-09
Manufactured to Porsche's original equipment specification, these genuine ignition coils deliver the precise ignition performance required by the legendary 3.6ltr Mezger twin-turbo engine, ensuring smooth power delivery, reliable cold starting and maximum engine efficiency.
Why Does the 997.1 turbo Use Two Different Ignition Coils?
Unlike most Porsche flat-six engines, the 997.1 turbocharged engine uses two different ignition coil part numbers. This is not because cylinder 6 requires a different spark output, but purely due to packaging constraints around the turbocharger assembly.
The factory configuration consists of:
- 5 × Genuine Porsche Ignition Coils – 99760210405
- 1 × Genuine Porsche Ignition Coil – 99760210406 (Cylinder 6 only)
Cylinder 6 sits extremely close to the Variable Turbine Geometry (VTG) turbo actuator and surrounding turbocharger hardware. There simply isn't enough clearance for the standard ignition coil, so Porsche designed a shorter-profile housing specifically for this location.
Importantly, both coils produce identical ignition energy and electrical performance. The only difference is the physical housing design, allowing the cylinder 6 coil to fit safely without interfering with the turbocharger components.
This is why this Porsche ignition coil kit for the 997.1 turbo / GT2 includes five standard coils and one shorter cylinder 6 coil.
Why Do Ignition Coils Fail?
Ignition coils operate in one of the harshest environments on the engine, exposed to continuous heat cycles, vibration and moisture. On the turbocharged Mezger engine, the proximity of the exhaust manifolds and turbochargers subjects the coils to even greater thermal stress.
Over time the epoxy resin and insulation within the coil can deteriorate, while the outer plastic housing may become brittle and develop hairline cracks. Moisture entering these cracks can cause the electrical spark to track to earth instead of the spark plug, resulting in inconsistent ignition performance.
Although a single failed coil can cause noticeable running issues, the remaining coils are usually of a similar age and condition. Replacing the complete set ensures balanced ignition performance across all six cylinders and reduces the likelihood of future failures.
Common Signs of Failing Ignition Coils
Typical symptoms include:
- Engine misfire
- Rough or unstable idle
- Hesitation under acceleration
- Reduced engine performance
- Poor throttle response
- Increased fuel consumption
- Illuminated Check Engine Light (CEL)
- Fault codes relating to cylinder misfires
- Difficult cold starting
If left unresolved, persistent misfires can increase exhaust emissions and place unnecessary strain on the catalytic converters and oxygen sensors.
Why Replace the Complete Set?
Replacing all six ignition coils together is considered best practice, particularly on higher mileage vehicles or whenever the spark plugs are being renewed.
Benefits include:
- Restores smooth idle and power delivery
- Reliable ignition under boost
- Reduced risk of future coil failures
- Improved fuel efficiency
- Consistent spark energy across all cylinders
- Helps protect catalytic converters from damage caused by misfires
Kit Contents
- 5 × Genuine Porsche Ignition Coils – 99760210405
- 1 × Genuine Porsche Ignition Coil – 99760210406 (Cylinder 6)
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99760210405KIT
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
Electrical plug housing - multiple applications (see below).
Porsche 986 Boxster 1997-04
- Camshaft position sensor
- Throttle valve
- Ignition coil
Porsche 996 Carrera & GT3 1998-05
- Ignition coil
Porsche 964/993 Carrera & Turbo 1994-98
- Crankshaft position sensor
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99965291640
The product you are viewing cross references to these numbers
Electrical plug housing - multiple applications (see below).
Porsche 986 Boxster 1997-04
- Camshaft position sensor
- Throttle valve
- Ignition coil
Porsche 996 Carrera & GT3 1998-05
- Ignition coil
Porsche 964/993 Carrera & Turbo 1994-98
- Crankshaft position sensor
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99965291640
The product you are viewing cross references to these numbers