NGK 4912 Spark Plug

NGK Laser Iridium Spark Plug 4912 Overview

NGK Laser Iridium Spark Plug 4912 is an OE-style replacement spark plug built for precise ignition performance and long service life. It uses an iridium center electrode tip, a nickel ground electrode, and a 0.044 in. pre-gap to match the factory-style setup used in many Toyota, Lexus, Scion, and Pontiac applications.

For drivers searching for a spark plug for 2010-2014 Toyota Prius, 2009-2014 Toyota Corolla, or 2011-2014 Lexus CT200h, this NGK Laser Iridium design is a direct-fit service part for the listed applications.

Key Features

• Laser Iridium spark plug with iridium center electrode tip material
• 0.044 in. pre-gap for OE-equivalent service applications
• 5000 ohm resistance for ignition system compatibility
• Standard ground electrode design with nickel core material
• Copper center electrode core for stable conductivity
• Flat seat, 12 mm thread diameter, 14 mm hex size, and 26.5 reach
• Heat range 7 for the specified factory applications
• Non-removable nut terminal type

Product Details

NGK part number 4912, also identified as ILKAR7B11, is engineered for vehicles that call for a Laser Iridium spark plug with OE-equivalent dimensions and gap. NGK’s long history as an original equipment supplier is reflected in the plug’s factory-style construction, which supports consistent combustion and dependable ignition performance in the listed Toyota Prius, Toyota Corolla, Toyota Matrix, Scion xD, Scion iQ, Lexus CT200h, and Pontiac Vibe applications. This part cross-references Autolite APP5683 and XP5683 for the same application.

What This Spark Plug Helps Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from inconsistent spark delivery
• Misfire conditions related to aged ignition components
• Reduced throttle response from degraded plug performance
• Service intervals on vehicles specified for long-life iridium plugs

Installation Notes and Tips

Verify the vehicle’s engine code and service requirements before installation. Confirm the specified gap is 0.044 in. and inspect the ignition coil boots, threads, and sealing surfaces during service. Use the correct torque procedure for the flat-seat design to avoid thread damage or combustion sealing issues. Fits 2015 Lexus CT200h, N/A; Fits 2011-2014 Lexus CT200h, N/A; Fits 2015 Toyota Corolla, N/A; Fits 2009-2014 Toyota Corolla, N/A; Fits 2015 Toyota Prius, N/A; Fits 2013-2014 Toyota Prius, N/A; Fits 2010 Toyota Prius, N/A; Fits 2011-2012 Toyota Prius, N/A; Fits 2015 Toyota Prius Plug-In, N/A; Fits 2013-2014 Toyota Prius Plug-In, N/A; Fits 2012 Toyota Prius Plug-In, N/A; Fits 2015 Toyota Prius V, N/A; Fits 2013-2014 Toyota Prius V, N/A; Fits 2012 Toyota Prius V, N/A; Fits 2014 Scion iQ, N/A; Fits 2012-2013 Scion iQ, N/A; Fits 2008-2014 Scion xD, N/A; Fits 2009-2010 Pontiac Vibe, N/A; Fits 2009-2014 Toyota Matrix, N/A.

Quality Assurance

NGK manufactures spark plugs for a wide range of domestic and import vehicles and supplies original equipment-level ignition components for North American applications. Part number 4912 is built to the listed OE-equivalent specifications for the covered vehicles.