fits e.g. Mercedes-Benz M-Class (W164) (please check exact vehicle application) HELLA exhaust gas temperature sensors use NTC thermistor technology to deliver accurate temperature data to the ECU, helping control emissions and prevent overheating. Supports lower emissions, improved efficiency, and optimized engine performance-resulting in better fuel economy and increased power. Built to meet or exceed OEM specifications, with a robust design for long service life and consistent reliability. Check OEM number to ensure proper fit and compatibility with your vehicle. Resistant to vibration, moisture, and dirt, HELLA sensors allow long-lasting, precise performance in harsh exhaust environments.