Powertrain
generic / SAE
P2579
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.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number5 / 79
Possible causes
- Oil-contaminated sensor tip high
- Aged Hall element medium
- Sensor element aged beyond calibration window low
Symptoms
- Check engine light on
- Significant power loss / limp mode
- Possible blue or black smoke from exhaust
- Whistling or hissing sound from intake
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 200–1000 €
- Estimated time: 0.6–2.5 h
- Component: turbo speed sensor a
- Component: turbocharger
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012