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You now need to drill a hole in one of the non-fouler's. Using a 1/2" drill bit. When finished this is what it will look like

0xygen Sensor Inserted in the Modified non-fouler

The Second unmodified non-fouler now installed on modified non-fouler, Then threaded into down pipe, (Or the Oxygen Sensor that goes toward back of the car) (The last one)

P0420 Code
Catalyst Below Threshold
(Bank 1)

And Code

P0171 Code
System to lean
(Bank 1)

Mazda Protégé 2000 How to Fix the P0420 Code:

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Make sure it says 18 Gauge on the Package

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