O2 Sensor Wiring Diagram Internal. Engine performance chip ecu tuning for power and mpg. The broadband oxygen sensor is based on the 4 wire version of the zirconia oxygen sensor with a modification for measuring the actual oxygen concentration instead of only producing a signal for a too rich or too lean mixture.
Secondary o2 sensor at the o2 sensor connector from 99 gs r schematic. The lambda sensor is an electrical sensor mounted inside the exhaust system which can measure how well the combustion is occurring inside the engine. There are 4 wires coming out of the sensor 2 black 1 gray 1 white.
By looking at the wiring diagrams see figures 5 and 6 for wiring diagrams provided by mitchell 1 prodemand we can figure out which wires belong to the oxygen sensor heater circuit by simply matching wire colors.
A three wire oxygen sensor has one wire for the sensing element which goes to the powertrain control module pcm. You want to inspect the o2 sensors and make sure you have the pre and post cat sensors in the proper locations and label each o2 sensor connector. The lambda sensor is an electrical sensor mounted inside the exhaust system which can measure how well the combustion is occurring inside the engine. Squeeze to release and pull it out gently from the oxygeno2 sensors housing.