Hello,
There are a few different reasons why you will get the rich/lean codes.
It could be due to the MAF sensor, fuel pressure regulator, it can even be due to a cracked EVAP canister.
I have attached the trouble shooting guide for the Codes P0171 and P0172 below.
Go through those steps, as it can help you determine the issue.
Please let me know if you have any questions.
Thank you.
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Sunday, January 30th, 2022 AT 6:29 PM