Mercedes-Benz W164 boost pressure actuator and power limitation (limp mode)
My W164 CDI goes into limp mode and power is limited, which boost pressure fault is it?
The most common cause is the turbo boost pressure actuator, the unit that controls the turbo. Fault code 2510 points to the actuator, not the sensor, and 2359 indicates too low a boost pressure. In limp mode the engine may not rev above about 3000 rpm.
Does the W164 boost pressure actuator need calibration after replacement?
The diagnostic tool has no calibration function for the actuator. The only adjustment is the length of the actuator link rod, which is mechanical and usually does not need adjusting. The movement of the link rod can be checked by hand after removing the actuator. Replacement is about a 30-minute job.
What else can cause boost pressure codes and power limitation in the W164?
An actuator fault is easily confused with other faults. Similar codes can also be caused by the exhaust back pressure sensor (code 2616-2) or a blown engine control fuse. Limp mode can be cleared by switching the engine off and restarting, but the cause should be found.