NGK 90911 Spark Plug
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NGK
 Laser Iridium High Ignitability Spark Plug

NGK 90911 Spark Plug

Brand NGK 90911
Resistance 5000
Ground Electrode Tip Design Tip
Ground Configuration Dfe
Ground Electrode Core Material Nickel
Electrical Terminal Type Stud
Center Electrode Core Material Copper
Center Electrode Tip Material Iridium
Pre-Gap Size 0.031
Ground Electrode Quantity 1
Hex Size 0.6299212598
Insulator Height 50.50
Manufacturer Heat Range 5
Seat Type Flat
Reach 0.75
Thread Diameter 14.00
Part Number Difr5c
Stock Number 90911
Product line Laser Iridium High Ignitability Spark Plug
Fits Toyota · 8 vehicles

Laser iridium design. Delivers precise ignition and dependable performance.

Copper core. Helps promote efficient heat transfer.

OE supplier heritage. Built by NGK, a long-time spark plug manufacturer.

Cross-references NGK 90911 for the same application. See all 1.

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NGK Laser Iridium Spark Plug for Prius C

The NGK 90911 Laser Iridium High Ignitability Spark Plug is built for drivers who need OE-style ignition performance and consistent combustion control. It is a direct-fit spark plug for 2012-2019 Toyota Prius C applications and is specified as a high ignitability design for this vehicle platform.

Key Features

  • Laser Iridium center electrode tip for stable spark performance
  • High ignitability design for OE-equivalent ignition characteristics
  • 5000 ohm resistor for ignition noise suppression
  • 0.031 in pre-gap size
  • 14 mm thread diameter, 0.75 in reach, flat seat
  • Nickel ground electrode with single-ground configuration
  • Copper core center electrode for heat transfer
  • NGK part number 90911 / DIFR5C

Product Details

NGK’s Laser Iridium High Ignitability line is engineered around original equipment requirements, with a focus on dependable spark delivery and long-term service consistency. This spark plug uses an iridium center electrode tip, nickel ground electrode construction, and a flat-seat design to match the specified OE-style application for the Toyota Prius C. The 2012-2019 Toyota Prius C, N/A fitment notes call for a high ignitability spark plug, and NGK 90911 is listed for that exact use case. This part cross-references NGK (e.g., 90911) for the same application.

What It Helps Address

  • Rough idle caused by worn spark plugs
  • Hard starting from weak ignition output
  • Misfire conditions related to plug wear or gap drift
  • Reduced throttle response from inconsistent spark delivery
  • Fuel economy loss tied to inefficient combustion

Installation Notes and Tips

Verify the application before installation and confirm the specified gap for your vehicle. For 2012-2019 Toyota Prius C models, the fitment notes list a 0.032 in gap requirement, while the plug is supplied with a 0.031 in pre-gap size. Use proper spark plug service procedures, inspect coil boots and ignition components during replacement, and torque to the vehicle manufacturer’s specification.

Quality Assurance

NGK is a major OE spark plug supplier in North America with decades of automotive manufacturing experience. The brand’s OE-focused production standards and broad vehicle coverage support consistent quality for ignition service parts such as the NGK 90911 spark plug.

Related reading

This part fits 8 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
2019ToyotaPrius C1.5LL4N/AOE Spark Plug Is High Ignitability. For Optimal Performance, Replace With High Ignitability Spark Plugs.; Gap 0.032"; OE Equivalent Design; Laser Iridium High Ignitability Spark Plug
2018ToyotaPrius C1.5LL4N/AOE Spark Plug Is High Ignitability. For Optimal Performance, Replace With High Ignitability Spark Plugs.; Gap 0.032"; OE Equivalent Design; Laser Iridium High Ignitability Spark Plug
2017ToyotaPrius C1.5LL4N/AOE Spark Plug Is High Ignitability. For Optimal Performance, Replace With High Ignitability Spark Plugs.; Gap 0.032"; OE Equivalent Design; Laser Iridium High Ignitability Spark Plug
2016ToyotaPrius C1.5LL4N/AOE Spark Plug Is High Ignitability. For Optimal Performance, Replace With High Ignitability Spark Plugs.; Gap 0.032"; OE Equivalent Design; Laser Iridium High Ignitability Spark Plug
2015ToyotaPrius C1.5LL4N/AOE Spark Plug Is High Ignitability. For Optimal Performance, Replace With High Ignitability Spark Plugs.; Gap 0.032"; OE Equivalent Design; Laser Iridium High Ignitability Spark Plug
2014ToyotaPrius C1.5LL4N/AOE Spark Plug Is High Ignitability. For Optimal Performance, Replace With High Ignitability Spark Plugs.; Gap 0.032"; OE Equivalent Design; Laser Iridium High Ignitability Spark Plug
2013ToyotaPrius C1.5LL4N/AOE Spark Plug Is High Ignitability. For Optimal Performance, Replace With High Ignitability Spark Plugs.; Gap 0.032"; OE Equivalent Design; Laser Iridium High Ignitability Spark Plug
2012ToyotaPrius C1.5LL4N/AOE Spark Plug Is High Ignitability. For Optimal Performance, Replace With High Ignitability Spark Plugs.; Gap 0.032"; OE Equivalent Design; Laser Iridium High Ignitability Spark Plug
Directly replaces or cross-references 1 part number
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
NGK — 90911