Quote:
Originally Posted by some_other_dave
You have two of them most likely because you have two banks of cylinders.
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What vehicle is this on? I would expect the fiesta would have 1 pre-cat o2 sensor and 1 post-cat o2 sensor. Perhaps the app you're using mislabeled the o2 sensor? On a vehicle with a V engine and a pre-cat o2 sensor on each bank, I would expect to see 4 fuel trims: bank 1 short term, bank 2 short term, bank 1 long term, bank 2 long term