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Hi Guys, Can someone please help me out ? I recently purchase 2011 Porsche cayenne S Hybrid and already had to change the Vacuum pump, after the installation we got this error P055600 . The error stands for " Pressure sender for brake booster implausible signal ". We changed the Sensor and we after we reset the code disappear . Took the car for road test for 10 min , when we park the car in front of the garage and brake, the error code came back .