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What is the function of o2 sensor?


tobye

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My mechanic says that the O2 sensors on the exhaust pipe need to be changed but i dont know why when i just went for getting the fuel filter changed as the car was giving bad fuel efficiency . My question is if i change the o2 sensors do all of them get changed and what are their functions.

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The thread has been created long ago, but I will give my inputs on this anyway. If there is no Check Engine Light (CEL) then the O2 sensors are probably working fine. A CEL doesnt always mean that O2 sensors need to be changed. You should hook up a diagnostic tool to the OBDII port and get the DTCs and then troubleshoot and solve the error. Would have saved you $$$.

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