Check engine light again
Thread Starter
Newbie
Joined: Feb 2010
Posts: 9
Likes: 1
From: Rhode Island
190d
Check engine light again
Good evening,
My wife has a 2008 R350 4matic with 162,500 miles one of the coils went and I replaced all of the coils and plugs car was back to normal running beautifully cleared the codes and drove it for a couple of days when the engine light came back on crazy thing is the car is idling and running perfectly, I apologize I should have the codes but wasn't planning on jumping on here, basically its telling me the left bank is running lean. I don't have a clue as to what to check or change so I guess what I am asking for are the possibles. MAF sensor seems to be okay....per benz mechanic what else could it be? Any ideas are greatly appreciated, car needs to get inspected asap.
Thank you for reading my post.
My wife has a 2008 R350 4matic with 162,500 miles one of the coils went and I replaced all of the coils and plugs car was back to normal running beautifully cleared the codes and drove it for a couple of days when the engine light came back on crazy thing is the car is idling and running perfectly, I apologize I should have the codes but wasn't planning on jumping on here, basically its telling me the left bank is running lean. I don't have a clue as to what to check or change so I guess what I am asking for are the possibles. MAF sensor seems to be okay....per benz mechanic what else could it be? Any ideas are greatly appreciated, car needs to get inspected asap.
Thank you for reading my post.
Super Member
Joined: Nov 2011
Posts: 973
Likes: 376
From: Austin, TX
2013 SL550 BiTurbo
Have you checked/replaced the up-stream O2 sensors? Misfires can burn them up sometimes...If they've not been replaced, with your mileage, I'd start there.
Also could be an intake leak from a bad gasket or broken manifold. A smoke machine would be your friend on that one...
Also could be an intake leak from a bad gasket or broken manifold. A smoke machine would be your friend on that one...
Last edited by nota_amg; Oct 17, 2018 at 10:36 AM.
Super Member
Joined: Jul 2009
Posts: 938
Likes: 53
From: Montreal, Canada
2005 C240 2011 R350
here you go...
https://www.autocodes.com/p0171_mercedes-benz.html
https://www.autocodes.com/p0171_mercedes-benz.html
