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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:
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- Porsche 944 2.5L 8V 1982-87
- Porsche 944 2.7L 8V 1988-89
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
- Porsche 944 Turbo 2.5L 8V 1985-88
- Porsche 944 Turbo 2.5L 8V 1989-91
- Porsche 944 Turbo S 2.5L 8V 1988
- Porsche 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 968 CS 3.0L 1993-95
- Porsche 968 Turbo S 3.0L 1993-94
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
The OE Match (Bosch style) ignition coil (Bosch MPN 0221118322, Porsche OEM 944.602.115.00 / 944.602.115.01) sold as the direct replacement coil, It’s the high-voltage transformer that converts 12–14 V battery energy into the high voltage a spark plug needs to ignite the air/fuel mix. Please note the Bosch product is no longer available so this is one of the only alternatives.
Fits:
Porsche 911 1984 - 1989 (not Turbo)
Porsche 924S 1986 - 1988
Porsche 944 1982 - 1991
Porsche 964 C2 / C4 1989 - 1994
Porsche 968 1992 - 1995
Porsche 928 Cars Up to 1988 *2 Ignition Coils Per Car
Replace the coil when any of the following apply:
• Out-of-spec resistance on primary or secondary (measured with DVM). If primary > ~1 Ω or secondary well outside the 5–9 kΩ region.
• Intermittent misfire(s), rough idle, loss of power, or poor fuel economy that follow coil diagnostics. Ignition coils degrade and can produce weak/inconsistent sparks before total failure.
• Check Engine Light with misfire codes (P0300–P030x) that point to a particular cylinder and a coil swap test proves the coil is at fault.
• Visible damage (cracked housing, carbon tracking/arcing, oil contamination of electrical terminals, corroded connectors). These are signs of imminent failure or arcing that can damage plugs/caps.
• Age / preventive maintenance: rubber seals, insulation and internal windings deteriorate with heat and time; on older cars it’s common to replace coils as part of ignition refresh.
Common failure modes / symptoms
• Cylinder misfires / rough running (single cylinder or random).
• Hard starts or no-start if coil output falls below what’s needed to light the plug.
• Check Engine Light with misfire codes (P0300, P0301… etc).
• Intermittent stalling or power loss under load (coil heating causes intermittent fault).
• Arcing / carbon tracking visible on coil body or cap — can cause cross-firing or misfires.
• Failed connectors / harness corrosion causing poor coil drive — sometimes harness/connectors are the root cause rather than the coil itself.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94460211501
The product you are viewing cross references to these numbers
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- Porsche 944 2.5L 8V 1982-87
- Porsche 944 2.7L 8V 1988-89
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
- Porsche 944 Turbo 2.5L 8V 1985-88
- Porsche 944 Turbo 2.5L 8V 1989-91
- Porsche 944 Turbo S 2.5L 8V 1988
- Porsche 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 968 CS 3.0L 1993-95
- Porsche 968 Turbo S 3.0L 1993-94
Fits:
Porsche 911 1984-89 (not Turbo)
Porsche 924S 1986-88
Porsche 944 1982-91
Porsche 964 C2 / C4 1989-94
Porsche 964 Carrera RS 1992
Porsche 964 C2 Tiptronic 1990-94
Porsche 968 1992-95
Click "Zoom In" for large parts diagram.
Diagram ref no 2.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94460280100
The product you are viewing cross references to these numbers
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
Fits:
Porsche 993 C2 / C4 / RS 1994-98
This product supersedes Porsche's old part numbers:
- 99360270600
Click 'Zoom in' for large parts diagram.
Diagram ref no 8
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99360270601
The product you are viewing cross references to these numbers