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Re: Oxygen sensor
That's what they want, they want you to pay them to replace all of the sensors so they can make money off you. If they know a sensor is not taking a reading, then they will be able to narrow it down and tell you which one it is.
The sensors on the engine side of the catalytic converter take oxygen readings for the engine to run from, and the sensors on the exhaust side of the catalytic converter take oxygen readings to be able to tell the computer whether or not the cat is doing its job. If they can't get a reading from one of these sensors, they can certainly tell you which one has malfunctioned.
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