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Code P0420 Emissions system

Tiny
COUNTRYGIRL20053
  • MEMBER
  • 2016 CHEVROLET SONIC
  • 1.4L
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 90,000 MILES
We have replaced the fuel cap and have changed one purge value and after a couple of days the check engine light came back on. So, we put another purge value on it, and it didn't come back on in over a week, and this morning I used auto start and it came right on after I got in the car. Would there be a reason why it could be doing this or is there another reason why?
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Monday, November 29th, 2021 AT 11:28 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi,

The code, P0420, is related to a catalytic converter not operating properly. Is this the only code you have? I ask because it could be related to the heated oxygen sensor as well. However, if there is no code for the sensor, chances are the converter needs replaced.

Take a look at the pic below. It provides a basic inspection of the converter. Check through it and perform any of the steps you can and let me know the results.

Take care,

Joe

See pic below.
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Monday, November 29th, 2021 AT 6:35 PM

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