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Old 11-21-2001, 12:47 PM
Fred Zimmer
Posts: n/a
Question '95 C280 Oxygen Sensor

I just picked up a Bosch # 13427 (0258003427009) Oxygen Sensor to
satisfy my check engine light. I checked the Bosch site and it appears
to be the right one.
I can't identify or locate the existing one based on the part I bought.
Can some one tell me where it is located and installs? Or is this the
wrong part?
thank you
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Old 11-21-2001, 08:07 PM
David C Klasse's Avatar
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Join Date: Jan 2001
Location: Mission Hills in the City of San Diego
Posts: 2,352
Which O2 sensor? IS your problem with the front (main), or the rear (downstream) 02 sensor?

Did you have the codes read to find out which 02 sensor is faulty?
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Old 11-21-2001, 09:48 PM
Registered User
Join Date: Dec 2000
Posts: 368
You need to have the codes read in order to know exactly which O2 is faulty, just as Dave mentioned. However, I could tell you which one you purchased just by the length of the wire. The main O2 has a very short wire about 20cm. The secondary O2 has a very long wire probably double in length or more.
You better hope that the main is faulty because the secondary is a pain in the *** to change.

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Old 11-22-2001, 08:02 AM
Registered User
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,784
A Check Engine light is an emmission system fault warning.
There are approx. 60 faults that will trip it.
There is a diagnostic module to retrieve the correct fault. Until you retrieve these codes, it's a crap shoot. Can be as simple as an unplugged sensor/vac hose.
At the price of parts, I would not change anything until you have read the diagnostic codes . That is why they are there.
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Old 11-22-2001, 08:39 AM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
The O2 sensors are in the exhaust, under the car. The mixture control one is in front of the cat and the cat testing sensor is at the rear.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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