This ignition coil is a replacement for OE 31358940. It generates the high-voltage energy required to ignite the air-fuel mixture in 4-cylinder turbocharged engines, ensuring smooth power delivery and fuel efficiency. The copper winding and iron core design maintain voltage stability under temperature fluctuations, while the resin body protects against heat and vibration. Installation is straightforward — simply remove the old coil, connect the new one, and secure it to the original mounting point. Please make sure to confirm the OE number before purchasing.