Mercedes-Benz R23 Oxygen Sensor OZA603-MB6 A0085423318 Stable Exhaust Monitoring

When your Mercedes-Benz R23 shows idle instability, weak acceleration, noticeably higher fuel consumption, or frequent MIL illumination, the likely cause is aging O2 sensor causing inaccurate exhaust monitoring. This sensor continuously monitors exhaust oxygen and feeds ECU to adjust the air-fuel ratio for efficient combustion and reduced emissions. OEM number OZA603-MB6 (corresponding to A0085423318) fits Mercedes-Benz R23. Install only with the engine cold to avoid scalding; use a dedicated socket to tighten to the specified torque to prevent thread stripping or sensor damage.