Hesitation due to faulty oxygen sensor on Hyundai Veracruz

A hesitation on acceleration may be noted when the engine is warm. The Check Engine Light may or may not illuminate. The is commonly caused by a faulty oxygen (O2) sensor. An undated oxygen sensor is available to correct this issue.

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Average mileage: 95,899 (60,000–130,000)
2 model years affected: 2007, 2008
11 people reported this problem
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problem details
2007 Hyundai Veracruz 90,000 mi,
Has not been fixed yet, dealer said it could be one of for Co2 sensors.
2008 Hyundai Veracruz 100,105 mi,
Check engine light was flashing but car seemed to run fine. Needed both oxygen sensors replaced $670 at dealership.
2008 Hyundai Veracruz 60,000 mi,
The dealer told us the O2 sensor was bad. It fixed the problem for about a week. Light came back on and they said it was a different sensor. Asked them how many O2 sensors the Veracruz had and they said 4. We are 3 sensors in and the light has come on again. Does any one know how many O2 sensors a Veracruz really has?
2008 Hyundai Veracruz 61,000 mi,
Check engine light is on. Auto Zone diagnosis said P2271. Heated Oxygen Sensor.