NGK 49423 Ignition Coil

NGK COP Ignition Coil for Toyota and Lexus

The NGK COP (Pencil Type) Ignition Coil Multi-Pack is a standard replacement ignition coil built for distributorless ignition systems. It is engineered to meet or exceed OE standards for durability and consistent spark delivery, making it a direct-fit service part for late-model Toyota, Lexus, Scion, and Pontiac applications.

Use NGK part number 49423 when replacing a worn coil on vehicles such as the Toyota Corolla, Toyota Prius, and Lexus CT200h. This NGK COP ignition coil line is developed and tested in an ISO 17025 accredited lab to verify performance under demanding conditions.

Key Features

• COP (pencil type) ignition coil for distributorless ignition systems
• 12.0-volt standard replacement design
• Blade terminal type with 4 terminals and 1 connector
• Bolt-on mount type with 1 mounting hole
• Female connector gender and male terminal gender
• Black housing for OE-style service replacement
• Oil-filled: No
• NGK part number 49423 / U5145-4

Detailed Description

NGK 49423 is a COP ignition coil designed for vehicles that use pencil-style coils mounted directly over the spark plug. It supports OE-level fit and function for a wide range of import and domestic applications, including Toyota Corolla, Toyota Prius, Toyota C-HR, Lexus CT200h, Scion xD, and Pontiac Vibe. The coil is built for distributorless ignition systems and is intended to restore stable ignition performance when an original coil begins to fail.

NGK’s ignition coil program is backed by long-term OE experience and global manufacturing support. The brand’s coil designs are validated in controlled test environments to confirm durability and operational consistency across demanding conditions. This part cross-references DENSO Auto Parts 673-1310 for the same application.

What It Helps Fix

• Engine misfire caused by a weak or failing ignition coil
• Rough idle during cold start or at stoplights
• Hard starting related to inconsistent spark output
• Loss of acceleration response under load
• Check engine light conditions tied to ignition performance

Installation Notes and Tips

Verify connector style, terminal count, and mounting style before installation. This coil uses a bolt-on mount and a female connector, so the original electrical plug and mounting point should match the vehicle’s OE configuration. Inspect the spark plug well, connector terminals, and nearby wiring for heat damage or corrosion before installing the replacement coil.

For best results, replace any worn spark plugs and clear diagnostic trouble codes after repair. Confirm vehicle-specific fitment for 2008-2022 Toyota, Lexus, Scion, and Pontiac applications listed for this part number 49423.

Quality Assurance

NGK ignition coils are manufactured to meet or exceed OE standards and are tested under extreme conditions in an ISO 17025 accredited laboratory. That quality focus supports consistent performance for service work on Toyota Corolla, Toyota Prius, and related fitments covered by NGK part number 49423.