C4 MK2 C139D

[K_gopsill]

Hi all, new to the group, just bought an accident damaged c4, it needed a new ABS pump, swapped that over with a 2nd hand one with all the same numbers, bled it all and all is fine. Only problem i have now is error code C139D, longitudinal acceleration sensor, won't go away, anybody had any issues with this? Is it a case of swapping the sensor? Thanks

[GiveMeABreak]

It means the longitudinal acceleration sensor needs calibrating using Lexia / Diagbox.

Fault Code:	C139D
Description of Fault:	Longitudinal acceleration sensor calibration fault: Calibration. The time of appearance of the fault code varies from 100 to 640 milliseconds following the calibration of the sensor. Possibility 1 Gyrometer/accelerometer sensor calibration problem (Offset on the longitudinal acceleration) Possibility 2 Problem with identification of the gyrometer/accelerometer sensor Conditions of activation of the diagnostics: Calibration of the gyrometer/accelerometer sensor
Conditions for Fault to clear:	Gyrometer/accelerometer sensor (Calibrated)
Downgrade Modes whilst Fault is active:	All of the regulation functions are inactive: Hill start assistance function inactive Switching of the electric parking brake to manual mode Switching on of the warning lamp and/or warning message Warning lamp ESP/ASR Electric parking brake automatic functions deactivation warning light "SERVICE" warning lamp
Symptoms:	Lighting of the ABS and ESP warning lamps
Suspect Areas:	Electrical harness Gyrometer/accelerometer sensor ESP ECU Connectors

[K_gopsill]

Thanks Marc, I have a foxwell diagnostic, can it be calibrated using this or is it Lexia only? Thanks

[GiveMeABreak]

I really can't advise on this I'm afraid, as I can only advise on the capabilities of Lexia / Diagbox which is what the dealerships use. I really depends on the diagnostic tool's capabilities and you'd have to confirm this with the manufacturer.

[K_gopsill]

No worries, thanks for your help, is there a list of people that could help who does have Lexia, i'm Birmingham/Solihull based. Thanks

[myglaren]

There is a list of members with diagnostic equipment here and at the foot of the list a link to a map of their locations.