The way to check the oxygen sensor is really easy, you only need a multi -control or multimeter, without disconnecting the harness of the oxygen sensor and with the engine on at normal operating temperature, it turns on the multiprovator and place it in the direct or continuous voltage range, if it is digital in author and but select to the low range of 200 volts, the black tip is put to a good earth without a good earth without a good ground Disconnect the harnes and one of the rear parts of the Czech harness each tip and where you see that it marks you of a range of approx. From .200 a .850 volts approx. Czech that the voltage varies constantly in that range, if it is fixed and there is no variation the sensor does not work.
Note: If the fixed reading is left in a low range it is too poor mixing and if it stays in a high range it is too rich mix. Remember you must be varying the voltage constantly, if it is a and does not stop the sensor is in good condition and the only thing you must do is remove it to clean it. Good luck and if you have doubts, do not hesitate to ask me.
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