DTC P0557-00: Brake Booster Pressure Sensor Circuit Low: General Description

Idle Stop & Go (ISG) function automatically switches off the engine when the car is at a standstill and the clutch is not operated and starts it again as soon as the clutch is operated. This not only reduces fuel consumption, it also lowers emissions. ISG function also has a built-in sensitivity to driving safety and comfort.

The engine is not switched off if certain conditions relating to safety and comfort have not been fulfilled (For example, when the engine oil is still cold, when the battery is running low or when the outside temperature is below 3°C (37.4°F)). It can be deactivated by pressing the ISG OFF switch on the crash pad lower panel.

In order to ensure adequate brake power assistance in every situation, the brake booster is equipped with a partial vacuum sensor. The Brake Vaccum Sensor (BVS) is located beside the brake booster.