P254000 Fault Code Help
Thread Starter
Junior Member
Joined: Feb 2011
Posts: 36
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CLS400 (218.365)
P254000 Fault Code Help
Hi guys, my car was diagnosed with Xentry and there was a F code with current and stored marked.
The problem was in FSCU07 control unit 'Fuel Pump' dignosis identifier P254000 "the signal for the pressure sensor of the low pressure fuel circuit is implaussible"
I have sent it to MB authorized service center, they found a small leak at the top of the fuel tank because my O ring seal not elastic anymore then they change it to the new one and clean the pressure sensor with contact cleaner.
They have tried to change the fuel pump pressure sensor and the F code gone then they tried to change it back with my old fuel pump pressure sensor which has already cleaned and there is no issue too.
I got back my car from workshop, use it for 1 day then i check again with xentry the F code return.
Anyone has this experience before?
How to solve it? do i have to change the fuel pump pressure sensor or the fuel pump itself?
Thanks
The problem was in FSCU07 control unit 'Fuel Pump' dignosis identifier P254000 "the signal for the pressure sensor of the low pressure fuel circuit is implaussible"
I have sent it to MB authorized service center, they found a small leak at the top of the fuel tank because my O ring seal not elastic anymore then they change it to the new one and clean the pressure sensor with contact cleaner.
They have tried to change the fuel pump pressure sensor and the F code gone then they tried to change it back with my old fuel pump pressure sensor which has already cleaned and there is no issue too.
I got back my car from workshop, use it for 1 day then i check again with xentry the F code return.
Anyone has this experience before?
How to solve it? do i have to change the fuel pump pressure sensor or the fuel pump itself?
Thanks
Thread Starter
Junior Member
Joined: Feb 2011
Posts: 36
Likes: 0
CLS400 (218.365)
or maybe should i change the new fuel pressure sensor because they just clean the sensor with cleaner.
Thanks
Thread Starter
Junior Member
Joined: Feb 2011
Posts: 36
Likes: 0
CLS400 (218.365)
update here.
i have change the fuel pressure sensor but the Fault code back again.
actually no real problem happen regarding this Fault, it only can be detected when we scan the car with xentry.
i still figure out what hardware i should change, some told me its a control unit fuel pump and others told me its a fuel pump.
or maybe better i wait until something real affect my car performance?
i have change the fuel pressure sensor but the Fault code back again.
actually no real problem happen regarding this Fault, it only can be detected when we scan the car with xentry.
i still figure out what hardware i should change, some told me its a control unit fuel pump and others told me its a fuel pump.
or maybe better i wait until something real affect my car performance?
Senior Member
Joined: Jul 2019
Posts: 488
Likes: 122
C63 Vert
update here.
i have change the fuel pressure sensor but the Fault code back again.
actually no real problem happen regarding this Fault, it only can be detected when we scan the car with xentry.
i still figure out what hardware i should change, some told me its a control unit fuel pump and others told me its a fuel pump.
or maybe better i wait until something real affect my car performance?
i have change the fuel pressure sensor but the Fault code back again.
actually no real problem happen regarding this Fault, it only can be detected when we scan the car with xentry.
i still figure out what hardware i should change, some told me its a control unit fuel pump and others told me its a fuel pump.
or maybe better i wait until something real affect my car performance?
