NGK 4996 Spark Plug

NGK Laser Iridium Spark Plug 4996 Overview

NGK 4996 is a Laser Iridium spark plug built for OE-style ignition performance in a wide range of Toyota, Scion, Lexus, Pontiac, Chevrolet, Saturn, Geo, and Dodge applications. It uses an iridium center electrode, nickel ground electrode, and a 0.044 in pre-gap to support consistent firing and stable combustion.

The Laser Iridium Spark Plug line focuses on OE-equivalent fit and long service intervals, making this plug a direct-service choice for many Toyota Corolla, Toyota Prius, and Toyota Yaris applications. Part number 4996 is also referenced as IFR5T11.

Key Features

• Laser iridium center electrode for precise spark delivery
• Nickel ground electrode with standard tip and standard configuration
• 0.044 in pre-gap for listed applications
• 5,000 ohm resistance
• Flat seat design with 14 mm thread diameter and 5/8 in hex
• OE-equivalent design for many late-model Toyota and Scion vehicles
• Cross-reference: this part cross-references AMS Automotive 4701 for the same application.

Detailed Description

NGK 4996 is engineered as a Laser Iridium spark plug for vehicles that call for a 14 mm, flat-seat plug with a 0.044 in gap. The iridium center electrode helps maintain a focused spark point, while the copper core supports heat transfer and stable ignition performance. With NGK’s OE supplier background, this plug follows original-equipment standards used across many import and domestic applications.

Compatible With 2006-2019 Toyota Yaris, N/A; 2013-2015 Scion xB, N/A; 2005-2008 Toyota Corolla, N/A; 2007-2008 Toyota Prius, N/A; and 2003-2008 Pontiac Vibe, N/A. It also appears in fitment for Toyota Matrix, Toyota Celica, Toyota MR2 Spyder, Toyota Tacoma, Lexus SC300, Lexus GS300, and other listed applications. Part number 4996 is a practical OE-style replacement when the vehicle specification calls for IFR5T11 / NGK 4996.

Common Issues This Plug Can Address

• Rough idle caused by worn spark plug electrodes
• Hard starting from weak or inconsistent ignition output
• Misfire codes related to plug wear or incorrect gap
• Reduced fuel economy from degraded spark quality
• Loss of throttle response from aging secondary ignition components

Installation Notes and Tips

• Verify the engine’s required gap before installation; listed applications commonly use 0.044 in, while some Saturn and Geo applications specify different gaps.
• Confirm thread diameter, reach, seat type, and hex size match the engine specification.
• Use proper torque procedures for aluminum cylinder heads to avoid thread damage.
• Check the vehicle’s service information for emission-specific fitment notes, especially on Toyota 4Runner and Prius applications.

Quality Assurance

NGK manufactures spark plugs to OE standards and supplies ignition components for a broad range of domestic and import vehicles in North America. Part number 4996 reflects that OE-focused engineering approach, with coverage for many Toyota, Scion, Lexus, Pontiac, Chevrolet, Saturn, Geo, and Dodge applications.