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Johnny Grama

P055600 - Pressure sender for brake booster implausible signal

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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 .

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Was that code setting before replacement of the vacuum pump? Probably a good idea to smoke test the intake and see if/what's leaking vacuum. Or is the sensor wiring good, fully seated connector etc. 

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