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post #1 of 3 (permalink) Old 12-30-2011, 11:19 PM Thread Starter
BenzWorld Junior Member
Date registered: Dec 2011
Vehicle: 2001 Mercedes E320 4 MATIC
Location: Montreal, Canada
Posts: 9
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(Thread Starter)
Need Help

Hi There,
I have a 2001 E320 4MATIC with roughly 113000 km. The other day I went to start my car and I had to turn the key twice for the car to start, once the engine was running it sounded "rough". I thought that it might have been due to the fact that the car was outside in temperature of -15 celsius( i live in Montreal). The car was not accelerating smoothly and seemed luggish. At a stop light while idling, the car was vibrating and the check engine light came on. I drove it slowly back home and after parking it decided to wait a bit before trying to restart it. After roughly 3 hours I tried to restart it and with the key in position 1, a humming sound seemed to be coming from the right side of the engine, I turn the key and the car won't start, I turn the key a second time and it starts. I drove a bit and it seemed to be driving ok but the check engine light was still on. I spoke to a mechanic friend of mine and he said that it might be a Air flow sensor or an ignition coil, but to be more sure he would have to plug in a scanner to see what fault codes he gets. I've been reading posts of people who've had similar problems and said that it was a faulty k40 module. Anyone here had similar problems?
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post #2 of 3 (permalink) Old 12-31-2011, 01:02 AM
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Date registered: Mar 2005
Vehicle: '01-E320 & 02-ST2
Location: John 15:18-19
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Welcome. Please click user cp and edit details to add your vehicle and location to your profile, it's often helpful information when you're seeking assistance.

You posted into the general forum, which as the name suggests is generic information across all models. There is a forum specific to your car, the W210. If you scroll down the main forum page you'll find it in the sedans section.

However, the first/best thing to do is have the codes read. There are lots and lots of possibilities, and that's what the codes are for. Otherwise you are just guessing and that can get very expensive and frustrating very quickly. If you haven't done plugs, you're due for them, and worn plugs could cause this, as could a vacuum leak, bad wires, plugged cats, bad MAF, bad coil....etc. (Again...getting the codes will narrow this down.)

The K40 relay has rarely been an issue in the W210, though.

Some auto parts stores here will read them for free, call a few around you, or you can buy a basic code reader on amazon for US$30.

Once you get the codes, you can look them up on the list that is posted in the W210 forum stickies.

Good luck and Happy New Year.

Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; its inherent virtue is the equal sharing of misery. (Winston Churchill)
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post #3 of 3 (permalink) Old 01-03-2012, 11:20 AM Thread Starter
BenzWorld Junior Member
Date registered: Dec 2011
Vehicle: 2001 Mercedes E320 4 MATIC
Location: Montreal, Canada
Posts: 9
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
Thanks for the reply. I went to see a mechanic and after scanning he got a P0300 code, that read as a misfire, he told me that it was probably coil# 4. I was wondering if it is something that i would be able to change myself, and if so, does anyone know where I can find a diagram or pictures of which coil it is. i managed to find an oem part onliine for $77 delivered. thanks
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