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Welcome dear vister

In Oxygen sensor there comes four wires
Two are black, one is blue and other is black

check oxygen sensor with multimeter
if there is connectivity in both black heater wires then
sensor is okay otherwise replace the sensor

many of times people wash the the sensor and re-install that again and
do not get any benefit

so first check the continuty of both black wires
if that have contibuty then clean that and re-install
you will get result


For more to know see below video






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