Oxygen Sensor 4016021

This oxygen sensor measures 46.5 cm in length, 4.0 cm in width, and 20.0 cm in height, and weighs 0.046 kg. It is packaged in a box that is 46.5 cm × 15.0 cm × 5.0 cm and weighs 0.049 kg. The applicable replacement part numbers are 4016021 and 4013979.

The sensor monitors the oxygen level in the exhaust gases to maintain the correct air‑fuel mixture. When it fails, the engine may run too rich, producing black smoke, increased carbon monoxide, higher fuel consumption, unstable idle speed, reduced power, and premature damage to the catalytic converter. Prompt diagnosis and replacement restore normal engine performance, improve fuel efficiency, and lower harmful emissions.