<h2>Direct-Fit Ignition Coil and Iridium Spark Plug Service Kit for 2015-2018 BMW X4</h2> <p><strong>What it Does:</strong> Restores factory ignition energy, resolves high-boost misfires, and stabilizes idle by replacing aged coil packs and worn spark plugs in direct-injected 2.0L engines.</p> <h3>The Stock N20 Ignition Breakdown</h3> <p>Factory ignition coils on the turbocharged N20 engine face severe thermal degradation inside the tight F26 engine bay. Over continuous heat cycles, stock epoxy insulation micro-cracks, causing high-voltage dielectric breakdown and internal resistance spikes. Combined with direct-injection electrode erosion on standard plugs, this leads to spark blowout under peak boost, cylinder misfires (DME fault codes 140010/140001), rough cold starts, and reduced fuel efficiency.</p> <h3>The Engineering Solution</h3> <p>This comprehensive ignition service kit features four upgraded coil-on-plug assemblies paired with four fine-wire iridium spark plugs. The coils utilize high-grade internal copper windings and reinforced thermoplastic housings to deliver consistent, high-voltage secondary output under high cylinder pressures. The matching iridium plugs feature laser-welded fine-wire center electrodes and thermal-shock-resistant ceramic insulators, ensuring lower required firing voltage, precise flame kernel propagation, and extended service life.</p> <h3>Technical Specifications</h3> <table width="100%" style="border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px;"> <tr style="background-color: #f9f9f9;"> <td style="padding:8px;"><strong>Fitment</strong></td> <td style="padding:8px;">2015-2018 BMW X4</td> </tr> <tr> <td style="padding:8px;"><strong>Engine / Chassis</strong></td> <td style="padding:8px;">2.0L Turbo I4 (N20B20) / F26</td> </tr> <tr style="background-color: #f9f9f9;"> <td style="padding:8px;"><strong>Stock Output</strong></td> <td style="padding:8px;">240 hp / 258 lb-ft (Approx)</td> </tr> <tr> <td style="padding:8px;"><strong>Part Number</strong></td> <td style="padding:8px;">UF667, UF-667</td> </tr> </table> <h3>Compatibility</h3> <ul> <li>2015 BMW X4 xDrive28i (2.0L L4 Turbo - N20B20)</li> <li>2016 BMW X4 xDrive28i (2.0L L4 Turbo - N20B20)</li> <li>2017 BMW X4 xDrive28i (2.0L L4 Turbo - N20B20)</li> <li>2018 BMW X4 xDrive28i (2.0L L4 Turbo - N20B20)</li> </ul> <h3>The BMW Precision Standard</h3> <p>Engineered to meet rigorous European diagnostic standards, this direct-replacement kit delivers clean combustion cycles to prevent shadow codes, protect catalytic converters, and maintain true German drivability without triggering check engine lights.</p>