I have a 96 E320 (W210) that has been acting funny.

I had a Check Engine light that came on about 2 months ago. At the time, I called my mechanic who told me that I can ignored it and so I drove my car for 2 months without any problems.
Well, since then After about 20 mins of driving, when the car is idling (600 - 700 RPMs), the engine will stutter. As soon as I press on the gas, it will be ok.

I took the car in to my mechanic and he hooked it up to a computer that showed a O2 sensor error. He reset the car and told me not to worry about it. Well, I asked if resetting the car will make my stuttering problem go away, he said it should but if not, bring the car back in and we will replace the entire electrical harness. I thought this was a bit drastic so I am here to ask for a second advice.

Question:

Do you guys think that this stuttering problem is connected to the O2 sensor? if so just where is the sensor located on my car? I have no idea what it even looks like. (if you have a picture or a diagram, I would appreciate a copy)

If not, what else could it be?

Thank you in advance.

Help, anyone?

Your engine is designated by the MB code M104. Do a search on M104 AND oxygen sensor and you'll find a bunch of stuff instantly. Also search for M104 AND wiring harness, and m104 AND idle.

Sorry I don't have the answers but you will soon. Welcome to MercedesShop.com!

In case you did not know you can buy the PARTS you need from this site at great prices, click on fastlane and find them. If you are lucky, there will be a pic of the O2 sensor. If it is not listed call Phil at the 800# and he will get you the info quick.

-Tom

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RIP "Betsy" (Oo=*=oO)
'96 E 3 2 0 (W 2 1 0) M 1 0 4 (Totalled)
Spaces in sig so as not to screw up the SEARCH; every time someone searches for that MB they don't want my sig!

2004 Audi A8L
'98 VW Passat 1.8T 5M
'87 Alfa Romeo Milano 2.5L 5M
'67 Impala convertible, 327cid

If the O2 sensor fails, the system thinks the engine is lean and tries to richen it. This could cause the engine to stutter, but so could a lot of other things. Vacuum leaks, bad sensors, weak injectors ... I wouldn't jump to a wiring harness without an orderly diagnostic process.

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe

Thanks Guys,

Yes, I am new to this forum but it seems like a great place to find info for the do it yourselfer.