Price from
18.70 EUR
18.70 EUR
TRW PHD941 Spark Plugs
Bolt / Nut Version: Hollow Screw - Length [mm]: 335 - Length 2 [mm]: 233 - Supplementary Article/Supplementary Info: with gaskets/seals - Thread Measurement 2: M12x1 - Thread Type: Inner Thread; Outer Thread - Thread Measurement 1: M10x1
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TRW PHD941 Spark Plugs
The TRW PHD941 Spark Plug is a high‑performance ignition component designed for modern gasoline engines that demand reliable spark delivery and durability under demanding operating conditions. This plug combines advanced materials, precise engineering, and rigorous testing to deliver consistent performance across a wide range of vehicle models.
Key Features
- Advanced Ceramic Insulator: The ceramic insulator provides superior heat resistance, allowing the spark plug to maintain optimal operating temperatures even under high load or prolonged idling conditions. This reduces the risk of overheating and extends the life of the plug.
- Precision Electrode Design: The center electrode is engineered with a fine tip that promotes efficient ionization of the air‑fuel mixture, ensuring a strong spark at low engine speeds while maintaining stability at high RPMs. The ground electrode spacing is calibrated to provide consistent spark energy across the entire operating range.
- Corrosion‑Resistant Coating: A proprietary coating protects the metal components from rust and corrosion, which can otherwise degrade performance over time. This coating also helps maintain a clean spark gap by resisting deposits that may form during combustion.
- Durable Threaded Shell: The threaded shell is machined to tight tolerances, ensuring a secure fit in the cylinder head. It resists loosening due to vibration and thermal expansion, which can otherwise lead to misfires or reduced engine performance.
- Wide Compatibility: The PHD941 plug is engineered to fit a broad range of engines across multiple manufacturers, including popular models from Volkswagen, Audi, Skoda, Seat, and others. Its design accommodates various compression ratios and fuel types, making it a versatile choice for both everyday driving and performance tuning.
Performance Benefits
The combination of high‑temperature ceramic insulation, precise electrode geometry, and corrosion protection translates into several tangible benefits:
- Improved Fuel Efficiency: A clean, consistent spark reduces incomplete combustion, allowing the engine to burn fuel more efficiently. Drivers may notice a modest increase in miles per gallon.
- Enhanced Power Output: The plug’s reliable spark delivery supports higher compression ratios and advanced ignition timing strategies, which can result in noticeable gains in horsepower and torque.
- Reduced Engine Wear: By maintaining optimal combustion temperatures, the PHD941 helps minimize piston and cylinder wear caused by excessive heat or misfires.
- Longer Service Life: The corrosion‑resistant coating and robust ceramic insulator extend the plug’s lifespan, reducing the frequency of replacement and associated maintenance costs.
Installation Guidelines
Installing the TRW PHD941 Spark Plug is straightforward for technicians familiar with standard spark plug procedures. Follow these steps to ensure optimal performance:
- Prepare the Engine: Allow the engine to cool completely before working on the ignition system. This prevents burns and ensures accurate gap measurements.
- Remove Old Plug: Use a spark plug socket and ratchet to carefully unscrew the existing plug. Inspect the old plug for signs of wear or damage that may indicate underlying engine issues.
- Check Spark Gap: Measure the spark gap with a gap gauge. The PHD941 typically comes pre‑set to the manufacturer’s recommended specification, but verify it matches your vehicle’s requirements.
- Screw in New Plug: Hand‑tighten the new plug into the cylinder head, then use a torque wrench to achieve the specified torque setting (usually between 18–22 ft‑lb for most gasoline engines). Over‑torquing can crack the ceramic insulator; under‑torquing may lead to loosening.
- Reconnect Ignition Wires: Attach the ignition coil or distributor cap wire securely, ensuring a good electrical connection. Check that the wire is not pinched or damaged during installation.
- Test Engine Performance: Start the engine and listen for smooth idle and consistent acceleration. If any irregularities arise, double‑check the spark plug seating and gap.
Maintenance Tips
- Inspect spark plugs every 30,000–50,000 miles or as recommended by your vehicle’s service schedule.
- Avoid using excessive force when removing plugs; a gentle twist and steady pressure prevent damage to the ceramic insulator.
- Keep the engine bay clean to reduce dust accumulation on spark plug contacts, which can affect ignition quality.
- If you notice fouling or deposits on the electrode, consider adjusting fuel mixture or checking for air intake issues.
Compatibility Overview
The TRW PHD941 Spark Plug is engineered to fit a wide array of engine configurations. Below are some common vehicle families and engine types where this plug has proven reliable:
- Volkswagen: Golf, Polo, Passat, New Beetle, Jetta, and other gasoline engines.
- Audi: A3, TT, S4, R8, and various inline‑four or V6 models.
- Skoda: Octavia, Rapid, Roomster, Superb, and other front‑engine gasoline units.
- Seat: Toledo, Leon, Ibiza, and similar compact cars.
- Engine types ranging from naturally aspirated inline‑four to turbocharged four‑stroke engines with compression ratios between 9.5:1 and 11.0:1.
Why Choose TRW PHD941?
The TRW brand is synonymous with quality in the automotive aftermarket, and the PHD941 Spark Plug exemplifies this reputation. Its blend of high‑temperature ceramic insulation, precise electrode geometry, and corrosion protection delivers:
- Consistent ignition performance across a wide temperature range.
- Reduced maintenance intervals due to extended plug life.
- Compatibility with both stock and aftermarket engine modifications.
- A proven track record of reliability in high‑performance and daily driving scenarios alike.
Whether you’re a professional mechanic, an enthusiast seeking performance gains, or a regular driver looking for dependable ignition components, the TRW PHD941 Spark Plug offers a reliable solution that balances durability, efficiency, and power delivery.
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Category
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- Spark Plugs for Cars |
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International
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 25.38 EUR  18.90 EUR  18.61 EUR  21.37 EUR  22.44 EUR  15.70 EUR |
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| Tags | Thread Measurement |
| Identifiers | |
| Brand |  TRW is a brand that produces automotive parts and safety systems. Some of their notable products include airbags, seatbelts, and braking systems. The company has a long history of producing quality products and is known for their innovation in the automotive industry. |
| MPN | TRW PHD941 |
| ID | 20028270 |
| Dimensions / Weight | |
| Key Features | |
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