Fixed! 3rd Gen Honda Pilot LX EX EXL Elite AWD DTC P0420 Engine Emission System Problem Error Code 

Fixed! 3rd Gen Honda Pilot LX EX EXL Elite AWD DTC P0420 Engine Emission System Problem Error Code
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P0420 code definition:
Catalyst System Efficiency Below Threshold (Bank 1)
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What the P0420 code means:
A P0420 code indicates a problem with the catalytic converter. The purpose of the catalytic converter is to break down harmful pollutants created during the combustion cycle. By using fine platinum and gold meshes to filter exhaust fumes, the catalytic converter is able to reduce the emissions expelled from the exhaust pipe.
The catalytic converter has two oxygen sensors. One oxygen sensor is positioned in front (upstream) of the catalytic converter and the other O2 sensor is positioned at the rear (downstream).
If the upstream oxygen sensor is working properly, its readings should fluctuate from when the car is at operating temperature and when running in a closed loop. If the downstream oxygen sensor is working properly, and there isn't an issue with the catalytic converter, its readings should remain steady.
When the oxygen sensors have similar readings to each other, it indicates that the catalytic converter is not working as intended. If the voltage of the downstream oxygen sensor decreases and begins to fluctuate like the upstream oxygen sensor, it means the oxygen levels are too high and the Powertrain Control Module (PCM) will store the P0420 trouble code and turn on the check engine light.
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Common causes of the P0420 code:
Damaged muffler or leaks in the muffler.
Damaged exhaust manifold or leaks in the exhaust manifold.
Damaged exhaust pipe or exhaust pipe leaks.
A misfire in the engine.
Oil contamination in catalytic converter.
Faulty catalytic converter (most common).
Faulty engine coolant temperature sensor.
Faulty front oxygen sensor.
Faulty rear oxygen sensor.
Damaged oxygen sensor wiring.
Oxygen sensor wiring that is not properly connected.
Damaged oxygen sensor connectors
A leaking fuel injector.
High fuel pressure.
Use of the wrong kind of fuel (using leaded fuel instead of unleaded fuel)
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4 Common symptoms of a P0420 code:
Though there are often no noticeable symptoms of a failure within the catalyst system, including drivability problems, there are 4 common indicators of the P0420 code:
1. Check Engine Light is on. Many things can trigger the check engine light to turn on. A mechanic will need to use a diagnostic tool to read the code and pinpoint the exact cause of the problem.
2. Lack of power after vehicle warms up. The engine will not run as well and may not provide enough power for acceleration.
3. Speed of vehicle may not exceed 30-40 mph. This may cause issues when driving along highways and freeways with higher speed limits, though you may not notice the symptom if you drive slower through mostly-residential areas.
4. Rotten egg smell coming from the exhaust pipe. This smell occurs from the incorrect amount of oxygen in the catalytic converter, which leads to excess sulfur in the fuel tank, creating the odor from the exhaust system.
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