I have 62,000 miles on a 1994 car.
Should the oxygen sensor be changed?
Is there any way to check if it is working fine or not?

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Smoke Silver 1994 E220 Coupe Automatic
0 kilometers 6 September 1994
100,635 kilometers - 6 September 2010

O2 sensors are voltage generators. The test is to hook a voltmeter and take readings. The FSM contains the specs you'll be looking for.

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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't

Yep,

You can check it.. does your mileage seem low? I'd guess it's useful life is closer to 100k miles. But I think I did mine about 70-80k as it had seen lots of short commuting trips.


Michael

My mileage seems ok, averaging about 23mpg.
To be honest I don't know if this is good or bad for an E220C

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Smoke Silver 1994 E220 Coupe Automatic
0 kilometers 6 September 1994
100,635 kilometers - 6 September 2010

1994 was on the line between 60k mile and 100k mile sensors. It looks like yours is a 60k mile so it would be time to replace it. In kilometers Bosch calls it good for 100,000, so you are right there. Page 84 here:

http://www.bosch.com.au/content/language1/downloads/Oxgen_Sensor__Cat_WEB.pdf

How can I tell which 02 sensor is there? The car was delivered in September 1994, but was special ordered earlier in 1994 (due to specific color, trim, extras combo)

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Smoke Silver 1994 E220 Coupe Automatic
0 kilometers 6 September 1994
100,635 kilometers - 6 September 2010

The date doesn't matter - all the same, 320 for the direct fit and 506 for the universal. See page 27.

i have a 1989 300ce.my mechanic told me at 65,000 miles the o2 sensor needed to be replaced,even though it was not sending the check engine light on,the car now has 68,000 miles on it so im just about to replace it. i found a cheap bosch sensor on ebay for about $42.00.

Can you let us know if you notice any difference after replacing it?
I assume though the 02 sensor should be tested before replacing it?

What else may need replacing at 100,000km?

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Smoke Silver 1994 E220 Coupe Automatic
0 kilometers 6 September 1994
100,635 kilometers - 6 September 2010