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The 2013 GMC Terrain is equipped with two oxygen sensors, commonly referred to as O2 sensors. These sensors are located at the back of your vehicle, positioned both before and after the catalytic converter. The converter sits near the evap canister, situated above the muffler towards the rear of the exhaust system. If you need to replace the O2 sensor or sensors, the cost will be approximately $90 to $130 for both.
The o2 sensors in a 2013 GMC Terrain are found within the exhaust system, with some vehicles having as many as five of these sensors.