NGK COP Ignition Coil Stock # 48841

The NGK COP Ignition Coil Stock # 48841 is a coil-on-plug (COP) ignition system component engineered for vehicles using direct-coil technology. As a mechanic, you know that COP systems have replaced traditional distributor-based ignition in modern engines, delivering precise spark timing directly to each cylinder. This compact unit is essential for maintaining reliable cold starts, smooth idle, consistent fuel economy, and proper emissions performance—especially critical in turbocharged and high-compression engines where ignition timing tolerance is razor-thin.

NGK COP ignition coils use advanced ferrite core technology and precision copper windings to generate the 30,000+ volts required for reliable spark plug firing under extreme combustion pressures. Unlike older coil designs, COP units eliminate secondary wire resistance loss and radio frequency interference, resulting in cleaner ignition events and extended spark plug life. The compact form factor (3 x 2.9 x 8.4 inches, 0.55 lbs) allows mounting directly atop the spark plug, reducing circuit complexity and improving heat dissipation in tight engine bays. NGK's quality construction ensures consistent performance across the full RPM range, from idle stability to wide-open throttle response.

This NGK unit is ideal for owners experiencing misfire codes (P0300–P0308 range), rough idle, hesitation during acceleration, or failed spark tests on coil-dependent platforms. When replacing a worn or failed COP coil, always swap all units in a set to prevent uneven performance—mixing old and new coils creates timing inconsistencies that can trigger check-engine lights. Installation requires only a simple connector disconnect and coil removal; no special tools needed. Confirm your vehicle platform before purchase, as COP applications vary by manufacturer, model year, and engine displacement—cross-reference the MPN U5051 against your engine service manual or use a parts lookup tool for exact compatibility.