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[Tavel]

Originally Posted by Sudhir

Should I replace both the sensors? Money is tight. Car is running fine, suggest something please.

Should I buy the O2 sensors with the connectors? And how much do mechanics usually charge changing them?

rule of thumb: the front O2 sensor controls fuel mixture, the rear sensor controls emmisions.

You can test the sensors instead of blindly replacing them, I'm not up on the procedure but you should be able to find it in a decent repair manual.