Turbocharger/Supercharger Speed Sensor A Circuit Range/Performance
Turbo speed sensor A is electrically intact, but the speed reading does not match the model — for example a speed that does not climb when boost rises, drifts away from the air-mass-flow estimate, or jumps. Often blade-fouling, a contaminated sensor tip or aged element.
Affected components
- Turbo speed sensor a
- Turbocharger
Common causes
- High likelihood: Oil-contaminated sensor tip
- Medium likelihood: Aged Hall element
- Low likelihood: Sensor element aged beyond calibration window
Possible symptoms
- Check engine light on
- Significant power loss / limp mode
- Possible blue or black smoke from exhaust
- Whistling or hissing sound from intake
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.