Volkswagen Jetta Oxygen Sensor detects exhaust gases to assist the engine computer in maintaining the air-fuel ratio at the optimum point that ensures the engine produces power, consumes less fuel, and produces fewer emissions. It is similar to an electronic nose; a small zirconia or titania unit measures the amount of oxygen present in the hot exhaust against the outside air and transmits a voltage to the control unit to indicate whether the mixture is rich or lean and to make corrections to the fuel delivery in milliseconds. The fact that barometric pressure, temperature, and engine load constantly vary means that a healthy sensor will keep a Volkswagen Jetta running smoothly, avoiding slow acceleration, stalling, and unnecessary visits to the pump, as well as ensuring that emissions remain legally within the limits. Contemporary Volkswagen Jetta vehicles tend to have two Oxygen Sensor units; the upstream unit is in front of the catalytic converter and measures the raw gases passing through the engine, while the downstream unit is located after the converter and measures the performance of the converter in purifying pollutants. They are both sampling different data streams with the task being the same, but the computer can fine-tune the mixture and check the converter efficiency. P0130, P0141, or P0155 are trouble codes that warn drivers about a sensor that has gone out of range. Overlooking such warnings may result in higher fuel consumption and failure of the emissions test, and thus, by replacing a faulty Oxygen Sensor in good time, this will recover the performance of the Volkswagen and save the catalytic converter, making all Volkswagen Jettas efficient and clean.
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