Powertrain
generic / SAE
P0559
Brake Booster Pressure Sensor Circuit Intermittent
Same as P0555 with intermittent or erratic signal. Boost control tracks commanded vs. actual manifold pressure; persistent deviation means wastegate, vanes, hose or actuator are not delivering the requested pressure.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number5 / 59
Possible causes
- Intermittent contact at connector high
- Connector with intermittent contact under vibration low
- Harness routed against vibrating component 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: easy
- DIY: possible
- Estimated cost: 80–320 €
- Estimated time: 0.4–1.4 h
- Component: brake booster pressure sensor
- Component: brake booster wiring
- MIL / check engine light
Sources
References
sae:J2012