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mybenz | mysatisfaction Forum Index
   W203 C Class
     C Class Wiring Harnesses
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Posted on: 2008/5/14 20:03
Certified Benzitos
Joined: 2008/1/29
From: Ampang
Posts: 274
Benz Model: w203 c200k
C Class Wiring Harnesses
I came across the following article from another MB forum, and it especially applies those models with M111 engine.

"The camshaft adjuster leaks oil internally and this goes into the wiring loom (harness). The oil travels along the loom and usually ends up at the lamda sensor (O2) on the exhaust. If you're unlucky, it goes into the engine ECU...more money! This can be avoided by fitting an in-line loom mod bit, which is about 6" long and is designed to absorb oil and not let it pass through to the loom... The problem is only on later M111 engines - very last of the 202 c class, early 203 c class & 208 clks...Part number for the mod is 2711502733 - 14.36+vat. I would recommend anyone who has an early 203 4 cylinder with engine number starting M111 buys this part. It is an easy DIY fit. Remove front engine cover trim & plug new loom between cam adjuster & old loom. This may save you 1000+"

I would like to hear if any of our MyBenz members have experienced such situation with your O2 sensor or ECU drenched with oil. Is this loom/harness readily available in our local market?

Dalam zaman harga barang naik ni, I guess a little bit of preventive job will go a long way. As the saying goes, prevention is better than cure.


Posted on: 2008/5/14 21:51
Promo Masta
Joined: 2007/4/30
From: J.Bahru
Posts: 1139
Benz Model:
Re: C Class Wiring Harnesses

TQ for sharing the good info bro.
Later, need to check my engine.

Posted on: 2008/5/14 22:05
Certified Benzitos
Joined: 2007/11/29
Posts: 42
Benz Model:
Re: C Class Wiring Harnesses
Dear Bro Pemam4,
I think the article is valid,as it happened to my W203.I also
believed that this requirement is not limited to only M111
engine,as mine is M271.As such,it is also advisable for W211 (E200K) which has the same engine to have this harness installed.Even the code no for this part starts with 271.Fortunately in my case,it only affacted power supply to O2 sensor which triggers 'Engine Check' light.The O2 sensor is still usable though.I was advised by my tech advisor at C&C to install this harness and it cost RM480 per pair,minus labour.
Hope this will help u.
Posted on: 2008/5/14 22:08
Master Techie
Joined: 2005/12/1
From: Somewhere in Sg Buluh Selangor
Posts: 2608
Benz Model: W210 E230
Re: C Class Wiring Harnesses
Hello Bro

Again, not only to W202 only, also apply to W210 but to the TCU from gearbox. I did cleaned mine 3 months ago...1/2 kotak tisu habis la dibuat nya.....kene tukar oil seal kat connector kat gearbox....



Posted on: 2008/5/14 23:34
Re: C Class Wiring Harnesses

I think Coolmerc had this problem on his W210. However, he managed to get it sorted out at MM Shah Alam. He did mentioned something about a mod done to the wirings. His ride is a post-mod W210. Try PM-ing him. He may have the answer. Or better, contact Adi of MM.

Posted on: 2008/5/14 23:37
Certified Benzitos
Joined: 2008/4/6
From: KL
Posts: 1868
Benz Model: W124 230E
Re: C Class Wiring Harnesses
I was at MB service about a month ago talking about common problems with mercs and the service guy did mention this ECU oil flooding problem with the Peanut-eyed C-Class (W203). The workshop have had a few incidents where they've had to replace the ECU


Posted on: 2008/5/14 23:41
Re: C Class Wiring Harnesses

hoggies wrote:
I was at MB service about a month ago talking about common problems with mercs and the service guy did mention this ECU oil flooding problem with the Peanut-eyed C-Class (W203). The workshop have had a few incidents where they've had to replace the ECU

Waaah.....I seriously hope that MB shall bear the cost. Otherwise, I may have to sell my oil wells to pay for it!....he he he!

Posted on: 2008/5/15 0:38
Certified Benzitos
Joined: 2005/9/25
Posts: 65
Benz Model: C200K
Re: C Class Wiring Harnesses
This is a must for all W203 owner. It cost about RM120 for this extension loom wire (original mb part)

My first set of extension loom wire flooded with oil! Don't want to take any risk, hence,replaced with another new set of extension loom wire.

U'll be surprised with the oil that accumulated in the "extension loom wire"!
Posted on: 2008/5/15 10:37
Certified Benzitos
Joined: 2006/2/3
From: Kuala Lumpur
Posts: 71
Benz Model: W208 CLK 200K
Re: C Class Wiring Harnesses
Hello Benzers !

This problem occured to my W208. I did came up with a thread about it in 2006. Tried to find and paste it here but failed.

Anyway, did the whole replacement thing (ie: changed the Wiring Harness and the stopper at the camshaft)

The Wiring Harness alone cost RM$2300

Labour cost to fix it : RM$600

I think it's still a reasonable price to pay rather than changing to a new ECU!

Life is short . . .
So be quick !

Posted on: 2008/5/15 18:46
Certified Benzitos
Joined: 2007/8/27
From: Shah Alam
Posts: 1338
Benz Model: 190e
Re: C Class Wiring Harnesses
I heard about this issue sometime.. As for me its worth fixing this preventive gadget.. It will cost u a bomb if u wait till the issue happen to your car.. Dont let it happen guys.. Preventive maintenance is important.. eventhough u can afford to repair it if it happen, I bet you can't even afford to loose the time if it is stalled..

Happy Benzing..

Membership Number: 2051

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