Code P0171, rough engine operation after warming up?

2010 HONDA CRV
213,000 MILES • 2.4L • 4 CYL • 2WD • AUTOMATIC
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RAYMOND777
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The vehicle listed above runs rough after a brief warm-up as if a spark plug was misfiring. It idles perfectly from a cold start for about 2-3 minutes.
Being in Florida it doesn't take long for an engine to warm up.

The OBD code is P0171 (system lean bank 1).

We bought this vehicle several months ago and do not have a maintenance history. It has been running perfectly until last week.

Please advise.
Aug 10, 2022 at 5:49 PM
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SQM
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Hello,

The code P0171 can get triggered due to a number of reasons.
It could be for having a vacuum leak, faulty mass air flow sensor, exhaust leak, worn spark plugs, bad oxygen sensor etc.

Take a look at this guide, it covers the basics of the code.

https://www.2carpros.com/articles/repair-lean-mixture-codes-p0171-or-p0174-on-some-manufacturers

I have attached the troubleshooting guide for the code P0171 below for your reference.

Let me know of any questions.
Thank you.
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Aug 10, 2022 at 8:17 PM