Limp mode - W211 Y27/9 EGR positioner

[Pauljames]

Have a 2007 E220CDI - gone into limp mode.

Fault code is Y27/9 Left EGR positioner internal fault. Ran a dynamic test on the EGR valve which can back as working fine... anyone point me at what to try next....

 

[Botus]

similar to this one I expect

https://forums.mercedesclub.org.uk/index.php?threads/management-light.178432/