Black smoke:
If the oxygen sensor is faulty, the balance between air and fuel in the engine will be disrupted because the equipment responsible for regulating air and fuel transport will no longer function properly. Ultimately, this imbalance will negatively affect combustion efficiency, resulting in unburned fuel, ignition issues, or smoke-like emissions from the vehicle exhaust. This situation requires timely replacement.
Oxygen sensor poisoning:
In vehicles frequently fueled with leaded gasoline, even slight lead poisoning can affect the oxygen sensor. Using a tank of unleaded gasoline can help remove surface lead from the oxygen sensor, restoring normal function. However, due to high exhaust temperatures, lead can penetrate the interior of the sensor, hindering the diffusion of oxygen ions and causing sensor failure. In such cases, replacement is necessary.
Carbon accumulation:
Poor engine combustion or the accumulation of carbon or deposits such as oil or dust can enter the oxygen sensor, obstructing or blocking the flow of external air and gas into the sensor. This results in inaccurate output signals from the oxygen sensor. Carbon accumulation significantly increases fuel consumption and emissions concentration. Owners should promptly clean the deposits to restore normal sensor function.