A 2001 Corolla showed P0171. At idle, long-term correction was high; while driving it often fell, but at roughly 2200–2500 rpm both correction values rose sharply and the code set.
What the report actually shows
The owner supplied actual trim readings rather than only the fault code. The intermittent road-speed spike makes a single stationary idle snapshot insufficient.
Reported outcome
No confirmed repair appears in the cited thread.
What to take from this case
Record fuel trim with engine load, speed and temperature at the point the code appears. Compare idle and driving conditions before replacing an airflow or oxygen sensor.
This is a reported experience and an educational reading of its evidence, not a diagnosis for another vehicle. The original discussion is linked below; AI4Car has not independently inspected the vehicle.
Sources and further reading
Community discussion · outcome not verified
For information, not a diagnosis or repair instruction. A reported result may not apply to your car. Consult the manufacturer's guidance and a qualified technician.
How to use this information
This is an editorial interpretation of a public discussion. Replies, votes and an accepted answer do not prove a diagnosis. An author-reported finding or repair has not been independently verified by AI4Car. Illustrations are conceptual. Read the content limitations.
Content and reuse
An AI-assisted educational explanation prepared for AI4Car. References provide factual context; linking to a publication does not grant a license to its text or images or imply its author’s endorsement. No Creative Commons license is asserted for those third-party materials.
Illustration: AI-generated for AI4Car; a generic conceptual view, not a photograph of the reported vehicle or a manufacturer’s diagram. Content and licensing policy.
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