My buddy was talking about this yesterday, been seeing social media posts about how some stations are diluting fuel.
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2016 Chrysler 200, P0420 code
- Thread starter Stone Mountain Arms
- Start date
Reset and buy better fuel.
Definitely. Thanks for pointing me in the right direction.
Check for vacuum or exhaust leaks before the cat. If no leak is found then 
Most of the time P0420 pops up is when the downstream 02 sensor detects more fuel fumes getting past the catalytic converter. TL;DR the converter is not doing its job as efficiently as it should as it’s failing.
2 ways around the problem.. replace the cat or add a spacer on the downstream 02 sensor and ride it out..
Most of the time P0420 pops up is when the downstream 02 sensor detects more fuel fumes getting past the catalytic converter. TL;DR the converter is not doing its job as efficiently as it should as it’s failing.
2 ways around the problem.. replace the cat or add a spacer on the downstream 02 sensor and ride it out..
Ultimately you’ll end up replacing the cat. You can install a O2 sensor extender to trick the sensor for a while, repeatedly reset the code, or ignore the check engine light.
The sensitivity of a O2 sensor is pretty amazing, but when the sensor is in the hot exhaust airflow it converts whatever black magic into a voltage from .1 to .9 volts. When you either increase the efficiency of the cat by cleaning it, installing a spacer to reduce its sensitivity, ultimately you will end up replacing the cat.
You can push that off by a year or so by cleaning it or installing a spacer.
The sensitivity of a O2 sensor is pretty amazing, but when the sensor is in the hot exhaust airflow it converts whatever black magic into a voltage from .1 to .9 volts. When you either increase the efficiency of the cat by cleaning it, installing a spacer to reduce its sensitivity, ultimately you will end up replacing the cat.
You can push that off by a year or so by cleaning it or installing a spacer.
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