SKU: NGKU5251
UPC: 087295488560
MPN: U5251
The NGK U5251 (48856) is a coil-on-plug ignition coil built to original equipment specifications for engines running a one-coil-per-cylinder setup. It mounts directly over the spark plug, eliminating plug wires and the voltage loss that comes with them. NGK supplies ignition components to factory production lines, and this part carries the same engineering standard. It ships as a single unit, so buyers replacing a full bank should order one per cylinder. For anyone tracking down a misfire or refreshing a high-mileage ignition system, this is a direct-fit replacement, not a generic substitute. Browse the full ignitions and electrical lineup for matching components.
This is a pencil-type coil-on-plug unit in a black housing, sold as each. The pencil-type body inserts deep into the spark plug well, placing the coil close to the plug and delivering a clean, consistent spark with minimal energy loss. NGK builds these coils to match factory output curves, so dwell timing and spark energy stay within the parameters the engine control unit expects. The MPN is U5251, NGK stock number 48856, with a UPC of 087295488560. Shipping weight is roughly 0.68 lbs. Because it follows the original equipment design, it drops into the factory mounting location and connector without adapters or rewiring. Pair it with a fresh NGK spark plug for the best ignition results.
Reach for the U5251 when you're chasing a cylinder-specific misfire, a rough idle, or a check-engine code pointing at a failing coil. Coils degrade with heat and age, and replacing one weak unit often restores smooth running across the whole engine. Many technicians replace the coil and plug together since both wear over the same service intervals. Order one per affected cylinder, or a full set if you're refreshing the entire ignition system at once. For related ignition hardware, check out our coil harness options and the broader ignitions and electrical category.
The NGK stock number 48856 corresponds to part number U5251. Both identifiers reference the same coil-on-plug ignition coil. When ordering or cross-referencing, either the 48856 stock number or the U5251 MPN points to this single black pencil-type coil built to original equipment specifications.
The U5251 ships as a single unit, one coil per package. Engines that use one coil per cylinder will need a matching quantity, so order the number that fits your application. If you're refreshing an entire ignition system, buy a coil for each cylinder.
No. Because the U5251 is built to original equipment specifications, it drops into the factory mounting location and mates with the existing connector. No adapters, harness changes, or rewiring are needed for a direct-fit application.
Many technicians replace the spark plug and coil together since both wear over similar service intervals. A worn plug raises the load on the coil, so installing a fresh plug alongside the U5251 helps the new coil deliver consistent spark and a clean burn.
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