1999 jeep grand cherokee 4.0 gas tank removel

The Oxygen Sensors (O2S) are attached to, and protrude into the vehicle exhaust system. Grand Cherokee oxygen sensor locations for 4.0 and 4.7 engines Input circuit from the sensor back to the PCM to detect sensor operation.Low-noise sensor return circuit to the PCM.12–volt feed circuit for the sensor heating element.Current O2 sensors receive their fresh oxygen (outside air) supply through the O2 sensor case housing.įour wires (circuits) are used on each O2 sensor: The O2 sensor must have a source of oxygen from outside of the exhaust stream for comparison. The PCM uses this information to adjust injector pulse-width to achieve the 14.7–to–1 air/fuel ratio necessary for proper engine operation and to control emissions. In other words, if the oxygen content is low, the voltage output is high if the oxygen content is high the output voltage is low. Is something incorrect or missing? Please get in touch with us and we’ll fix it!Īn O2 sensor is a galvanic battery that provides the PCM with a voltage signal (0-1 volt) inversely proportional to the amount of oxygen in the exhaust. We have organized as much information as we could find into a helpful article below. Welcome to the in-depth page on WJ Generation Jeep Grand Cherokee oxygen sensors.

1999 jeep grand cherokee 4.0 gas tank removel