Walker Product's Oxygen Sensors are precision made for outstanding performance and manufactured to meet or exceed all manufacturers original equipment specifications and test requirements.
The oxygen sensor or sensors are located at points in the exhaust system stream, either in front of
(pre-cat) or behind (post-cat) the catalytic converter. Their function is to determine the amount of free oxygen present in the vehicles exhaust gases. The amount of oxygen shown in a vehicles exhaust is a good indictor of the combustion efficiency and is also the best place to monitor the air fuel ratio.
There are basically two types of after market oxygen sensors, Direct Fit and Universal Oxygen Sensors. The difference being is the Direct Fit Sensor has the OE matching connecting clip that couples the sensor with the vehicles wiring harness. It is a male female type relationship and fits together just like the OE sensor. A Universal oxygen sensor has bare wires that must physically soldered into the wiring harness of the vehicle. This requires the removal of the receiving clip on the vehicles harness so as to expose wires that they then may be joined with the universal sensor. The connection cannot be taped or twisted together...it must be soldered to negate any future problems. Shown here are two examples of Direct Fit Sensors and below is an image of a universal oxygen sensor.
Universal sensors are a little less expensive than their Direct Fit counter parts, but keep in mind O2 sensors read the content of exhaust gases and they operate in the milli volt range. While reading the composition of the exhaust gasses they send information constantly to the vehicles on board computer for processing. If the data is skewed in any way or the voltage is out of range it will trigger a trouble code and a check engine light will light. Since universal sensors must be spliced into the vehicles wiring stream, this many times will cause resistance at the splice point. To repeat, an oxygen sensor processes in milli volts so it takes very little resistance for it to feed bad information to the on board computer. Discount Converter, Ltd. sells only Direct Fit oxygen sensors which use the factory socket connector to mate with the snap connector on the vehicle, thus eliminating any chance for resistance and the transmission of bad information!
If you are purchasing a new catalytic converter we strongly urge you taking a close look at the condition of the O2 sensors. The primary reason for the failure of a catalytic converter is usually a bad O2 sensor. If the O2 sensors on your vehicle are still original and a new cat is being installed...REPLACE THE SENSORS! A bad O2 sensor can destroy your new catalytic converter in just weeks! The bad information it transmits causes the on board computer to adjust either a too rich or too lean fuel mixture, which in turn can create a melt down of the converters substrate or inner ceramic core. Once this happens your new converter is toast! The maximum life of most original equipment O2 sensors is 60,000 miles. If you would like to speak with us further about O2 Sensors or any other emission problem you may be having, please give us a call.