P0221: Throttle/Pedal Position Sensor/Switch B Circuit Range/Performance
Do not keep driving
Expect limp mode. Both sensors need to be evaluated together on live data, since the code identifies a disagreement rather than a culprit.
What this code means
Sensor B is electrically valid but disagrees with sensor A about where the throttle or pedal actually is. This correlation check is the whole reason the second sensor exists, and a disagreement is exactly what it is designed to catch. Note that the code names sensor B while the fault may lie with either sensor — the module can detect that they differ, not which one is lying.
Likely causes
Start here
- Faulty accelerator pedal position sensor · moderate
- Worn throttle position sensor track · moderate
- Carbon deposits in the throttle body · easy
Less common
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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