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How do you tell if an oxgyen sensor is bad?



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Best way is to hook up an osiliscope and see the wave pattern Some of the scanners will do this also. Check the price of a new DIRECT FIT sensor first before getting this done as most shops charge for the diagnostic time and if you know which sensor is suspect it might just be cheaper to just change it and be done with it. If you don't know for sure TEST DON'T GUESS, you can spend a lot of money guessing at fixes...