OBD-II code · Powertrain (generic)
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.
Is it safe to drive with P0559?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyIntermittent contact at connector
- Less likelyConnector with intermittent contact under vibration
- Less likelyHarness routed against vibrating component
Symptoms
- Check engine light on
- Significant power loss / limp mode
- Possible blue or black smoke from exhaust
- Whistling or hissing sound from intake
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.4–1.4 h
- Emissions test
- Usually unaffected
- Parts involved
- Brake Booster Pressure Sensor, Brake Booster Wiring
Related codes
- P0556Brake Booster Pressure Sensor Circuit Range or Performance
- P0557Brake Booster Pressure Sensor Circuit Low
- P0558Brake Booster Pressure Sensor Circuit High
- P055AEngine Oil Pressure Sensor or Switch B Circuit
- P055BEngine Oil Pressure Sensor or Switch B Range or Performance
- P055CEngine Oil Pressure Sensor or Switch B Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.