scsea1

We have a 2001 E320 4-Matic (130K Miles). Recently, it has developed a serious problem. Every now and then, when I come to a stop (e.g., at a red light), the car would shake/vibrate significantly. Even more importantly, the car seems to lose acceleration suddenly and unpredictably (not necessarily correlated with vibration at the stop). The latter problem goes away “for the moment” by switching off the engine and then restarting it. The Check Engine light has come on as well. The codes that are diagnosed are P2001, P2003, P200F, P2082, P2050, P20151, P2055, and P2053.

While there are several issues with the car, I am most concerned now with the two issues I highlighted above – sudden loss of acceleration and the vibration while stopped (both happening unpredictably). I took the car to two mechanics. The two mechanics seem to sharply differ on how to resolve the “sudden and unpredictable loss of acceleration” issue. One mechanic (Mercedes dealer) attributes the problem to issues with EGR valve and claims replacing that will fix the problem. The other mechanic attributes the problem to the Catalytic Converter which he says is broken and is causing sudden loss of acceleration (and yes, there was a rattle some time ago). The second mechanic does not disagree that the EGR valve (and the secondary air injection system) has issues but he says it is the Catalytic Converter which is causing the core problem of sudden loss of acceleration (and yes, there was a rattle some time ago).

Each of these are expensive repairs but what is worse is that the two mechanics don’t agree on the root cause. I would really appreciate any advice/thoughts from all of you. Thanks in advance

AZN Optics

Welcome to MBWorld

First issue kind of sounds like the motor mount needs to be replaced, but hard to remote diagnose.

Should try posting on the w210 subforum though to get more model specific feedback.

scsea1

Thanks, Michael for your input.Will try posting there.