Oxygen Sensor - Mercedes-Benz Forum

 
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post #1 of 8 (permalink) Old 07-25-2007, 08:23 PM Thread Starter
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Vehicle: Mercedes E200 kompressor, Engine size 1998cc, 96,000 KM
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Cool Oxygen Sensor

I had my Mercedes 2001 E200 W10 serviced recently 94,000kms. The emission indicator light had come on and my mechanic told me that my front 02 sensor was gone. This was replaced and the fault reset, the emission indicator came on about a week after again. He seems to think that the rear one is now gone. To say the least he charging me a small fortune. Is this a straight forward process to change? or is there another problem with the emission indicator being on.

Appreciate any thoughts
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post #2 of 8 (permalink) Old 07-25-2007, 08:40 PM
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Hi, portman, welcome to the forum.

When you have a second, please complete your user profile to include your car and locale, that can be quite useful.

Also, you've posted in the general forum, if you scroll down you'll find that there is a forum specific to your car, the W210 forum. Posting in there for questions about your particular car typically yields much more useful information.

The E320 V6 has four oxygen sensors, two on each bank. Typically when the CEL comes on and the codes are read, there are actually four different codes for the front and rear sensors on each bank. The complete set of four is about $420 at discounted online prices, so they're not exactly cheap anyway (that's a small fortune to me, even without labor to install them). If you purchase a tool (oxygen sensor socket) and do it when it's cool they are not that difficult and you can buy them at places such as Auto Parts at AutohausAZ - OEM Auto Parts - Discount Replacement Parts, Resources and Car Care Tips

Assuming your mechanic didn't misread the code, then he is probably right. If the light had come on and you (ahem) ignored it for long enough, that could be enough to damage the other sensor on that bank. On the other hand some folks say they're only good for about 75,000 miles anyways. The real question is whether you trust him, if so and you don't want to bother with it yourself, have him change it.

Take care and enjoy the ride,
Greg

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post #3 of 8 (permalink) Old 07-25-2007, 09:12 PM
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I am not familiar with your exact model, but oxygen sensors are usually pretty easy to change. Take a look at the one that need changing and decide for yourself. With some simple hand tools you might want to tackle it on your own. I'll second greg on Autohaus AZ.

Mike
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post #4 of 8 (permalink) Old 07-25-2007, 09:26 PM
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Quote:
Originally Posted by gregs210
The E320 V6 has four oxygen sensors, two on each bank. Typically when the CEL comes on and the codes are read, there are actually four different codes for the front and rear sensors on each bank. The complete set of four is about $420 at discounted online prices, so they're not exactly cheap anyway (that's a small fortune to me, even without labor to install them).
Even more after you add international shipping charges and duties.

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post #5 of 8 (permalink) Old 07-26-2007, 09:42 AM
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^^^ True...we can only guess at the location based on the km reference...

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post #6 of 8 (permalink) Old 07-26-2007, 09:44 AM
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^ "E200". Definitely not local.

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post #7 of 8 (permalink) Old 07-26-2007, 09:49 AM
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Originally Posted by GermanStar
^ "E200". Definitely not local.
Ah, good point, another clue. Well, if he's in Europe parts are supposed to be cheaper there, what? Now if there was just a germanstar.de ...

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post #8 of 8 (permalink) Old 07-26-2007, 10:57 AM
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Quote:
Originally Posted by portman2003
I had my Mercedes 2001 E200 W10 serviced recently 94,000kms. The emission indicator light had come on and my mechanic told me that my front 02 sensor was gone. This was replaced and the fault reset, the emission indicator came on about a week after again. He seems to think that the rear one is now gone. To say the least he charging me a small fortune. Is this a straight forward process to change? or is there another problem with the emission indicator being on.

Appreciate any thoughts
I'm not sure what you mean by "emission indicator," but I'm guessing you mean the Check Engine Light. Although that CEL might have something to do w/ your oxygen sensor, it could also be many other things, and unless that "mechanic" is MB certified I'd not waste any more money on him. My CEL used to come on and go out for a time and then come back on. I was told it was my gas cap but, but in the end it had nothing at all to do w/ that. As I recall it was my MAF sensor or catalytic converter or something. CEL's are very complicated indicators and can indicate many many problems; and it would be my recommendation that you take your car to the dealer and have the problem properly assessed and repaired.

Here's a little primer on CELs and MAFs:

Check Engine Light

mass flow sensor: Information from Answers.com

Don't believe everything you think
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