Need some help!
Thread Starter
Junior Member
Joined: Mar 2014
Posts: 61
Likes: 16
From: NYC
Current: 2007 ML63, 2008 CLK63 AMG Black Series
Need some help!
As i was driving back from work today, my check engine light came on. The car continued to run well and i just had done an oil change the day before. I looked up the codes and it came up with P0161 and P3699. ran some tests and this is what came up. i attached the full report if anyone was interested.
MID:$7e TID:$33 - Max: 817.70001g Min: 5,543.2002g Test result value: 6,552.30029g FAIL ---- MID:$81 TID:$3b - Fuel System Monitor Bank 1 Max: -2,457.6001 Min: 2,667.19995 Test result value: 1,561.59998 FAIL ---- MID:$81 TID:$40 - Fuel System Monitor Bank 1 Max: -2,457.6001 Min: 1,028.80005 Test result value: 1,561.59998 FAIL
from my understanding it might be a fuel pump issue from what my mechanic told me, but i think it might be a fuel filter problem.
Has anyone had this issue before?
MID:$7e TID:$33 - Max: 817.70001g Min: 5,543.2002g Test result value: 6,552.30029g FAIL ---- MID:$81 TID:$3b - Fuel System Monitor Bank 1 Max: -2,457.6001 Min: 2,667.19995 Test result value: 1,561.59998 FAIL ---- MID:$81 TID:$40 - Fuel System Monitor Bank 1 Max: -2,457.6001 Min: 1,028.80005 Test result value: 1,561.59998 FAIL
from my understanding it might be a fuel pump issue from what my mechanic told me, but i think it might be a fuel filter problem.
Has anyone had this issue before?
Member
Joined: Apr 2004
Posts: 108
Likes: 1
From: Ashburn, VA
2008 CLK63 Black Series
Your mechanic is right it is the Auxiliary Fuel pump. I had the same 3699 code before, and my mechanic replaced the pump and fuel pressure sensor on the rail due to fluctuating fuel pressure.
