The O2 sensors in your van perform diverse duties.Most modern O2 sensors have an electrical heating circuit built into the sensor. If the electrical heating circuit malfunctions or fails, it is not uncommon for the entire oxygen sensor to fail.
No motorcar part is built to last forever, and that is true for oxygen sensors extremely. Over time, normal wear and tear can cause your oxygen sensor to fail. Common causes include the gases from engine emissions and buildup of naturally occurring engine deposits.
Chemicals
Oxygen sensors can be damaged by bad gas, leaded gas, internal coolant leaks, burnt oil and even products that have been applied to other parts of the engine to fix problems, such as gasket sealers. Oxygen sensors are really only meant to be exposed to good quality fuel, so other additives or chemicals can cause them to stop functioning properly.
Heating Circuit
Their influential servicing is to scanner and adjust your vehicle's fuel alloy so that it gets the first-class credible fuel milage while emitting the least magnitude of poisonous emissions. Most vehicles compass diverse O2 sensors installed throughout the fuel manner and engine, so the duration "bank one" or "bank two" is used to distinguish the residence of the sensor.
