I have a badd O2 sensor but don’t know which one and the dealer is telling me I have to bring it in for them to scan and blah blah blah but you all know how they do. I know it’s the sensor but don’t know which one.
You have two sensors under your car. One before your catalytic and one after it. Go to Auto Zone and they will scan you for free. Then they will tell you which one is bad. Don’t buy an aftermarket sensor. Buy it at your local dealer.you can change it by yourself.
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2. You have one "pre" cat and one "post" cat o2 sensors. Look on the Look on the estimate sheet they gave you. "cat" refers to catalytic converter.
References :
You have two sensors under your car. One before your catalytic and one after it. Go to Auto Zone and they will scan you for free. Then they will tell you which one is bad. Don’t buy an aftermarket sensor. Buy it at your local dealer.you can change it by yourself.
References :
work on vw’s