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The 2012 Chevy Equinox has two O2 sensors, or Oxygen sensors, mounted on the catalytic converter towards the passenger side of the car. These sensors are crucial for the car's operation as they are connected to the exhaust pipes of the converter. Even though you can technically drive with malfunctioning O2 sensors, it's recommended to have them fixed promptly. They are essential for fuel efficiency and ignoring them could result in higher fuel costs and potential damage to your vehicle.
In the 2012 Chevy Equinox, the downstream oxygen sensor is positioned after the catalytic converter, while the upstream sensor is situated before the catalytic converter.