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P0121 describes a throttle-position range or performance issue

The observed throttle signal did not match the expected relationship or range.

September 25, 20261 min read
AI4Car quick readA short, original guide from the AI4Car knowledge library.

Check related throttle and pedal codes, connector condition, and live position data. Electronic throttle systems need the manufacturer’s test and relearn procedures.

Quick educational note

For information, not a diagnosis or repair instruction. Vehicle-specific checks are still required. Consult the manufacturer's guidance and a qualified technician.

How to use this information

This article explains general principles and does not establish what is wrong with your vehicle. Read the content limitations.

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P0121 describes a throttle-position range or performance issue | AI4Car