Oxygen Sensor?

Question:
I recently went to Autozone to purchase an oxygen sensor for my 2000 Jetta, but the Customer Rep. asked me if it's the 1st(top) or 2nd(bottom) section that needs to be replaced. The only way I can find out is by taking it to Pep Boys but they're a rip-off. Does anyone know which section it is?

Answers:

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