rudolf_phoenix41
Mercedes M Klasse Engine Issues
Summary of the thread
A 2009 Mercedes M Klasse is experiencing engine issues, including a check engine light, jerking during acceleration, unusual noises, stalling, increased fuel consumption, and reduced power. The suspected cause is a faulty boost pressure sensor cable or plug. A similar case involved a loose hose connected to the intake manifold affecting the turbo system. The solution involved confirming and repairing a defective cable connection to the boost pressure sensor, resolving the problem.
Did this summary help you solve your problem?
4 comment(s)
rudolf_phoenix41 (community.author)
Thanks for the response. Could you elaborate on the specific location of the hose you are referring to? Was the hissing noise constant, or only present during acceleration?
jessicafuchs8
It was a while ago, so I don't remember the exact location. The hissing was pretty noticeable most of the time, especially when accelerating. I'd take it to a workshop to check the pressure sensor and hoses around the intake manifold to be safe.
rudolf_phoenix41 (community.author)
I consulted a mechanic who confirmed a faulty boost pressure sensor, specifically a defective cable connection as suspected. The repair cost 95€ including parts and labor. Thanks; your experience was helpful.
rmh_community_comment_box_header
community_crosslink_scanner_headline
community_crosslink_scanner_intro
community_crosslink_scanner_title
community_crosslink_scanner_price
community_crosslink_rmh_headline
community_crosslink_rmh_intro
community_crosslink_rmh_title
community_crosslink_rmh_subtitle
community_crosslink_rmh_brand
MERCEDES
community_crosslink_rmh_model
MKLASSE
jessicafuchs8
That sounds rough! I had similar issues with my M Klasse. Check engine light, choking feeling when accelerating, and a weird hissing noise. For me, it was a loose hose connected to the intake manifold, throwing off the turbo system. Worth a quick look before tearing things apart.