Powertrain
generic / SAE
P2594
Turbocharger Speed Sensor B Circuit Range/Performance
Turbo speed sensor B is electrically intact, but the speed reading does not match the boost or air-mass model — same failure mode as sensor A performance fault, applied to the second turbo.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number5 / 94
Possible causes
- Oil-contaminated sensor tip high
- Sensor element aged beyond calibration window low
- Sensor mounting loose - signal damping 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 b
- Component: turbocharger
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012