Basically there are two types of after market oxygen sensors, Direct Fit and Universal Oxygen Sensors. The difference is, the Direct Fit Sensor has the matching OE connecting clip that mates the sensor with the vehicles wiring harness. 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 vehicle so wires can be exposed so they now may be joined with the universal sensor. This 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.

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