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#1
08-11-2011, 07:18 PM
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New O2 Sensor -- Code 12 on DM -- Defective?
Car: 1995 E320 / M104.992
Had an O2 sensor installed a few weeks ago. Was an aftermarket,no specific brand purchased on eBay. Got a CEL today with a code 12 on the DM: 12 Heated oxygen sensor heater circuit open or circuit short Is it a faulty sensor or something else?
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2008 E350 4matic / Black/Anthracite ------------------------------------ Gone but not Forgotten: 2001 E430 4matic, 206,xxx miles, Black/Charcoal 1995 E320, 252,xxx miles, Black/Grey 1989 260E, 223,00 miles, Black/Black 
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#2
08-11-2011, 07:35 PM
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Also -- does anyone know which generic Bosch 4-wire sensors are suitable replacement for an 95E320/M104.992 engine? I am doing emissions/safety this weekend and thus have to buy retail (and don't want to get dealer-gouged).
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2008 E350 4matic / Black/Anthracite ------------------------------------ Gone but not Forgotten: 2001 E430 4matic, 206,xxx miles, Black/Charcoal 1995 E320, 252,xxx miles, Black/Grey 1989 260E, 223,00 miles, Black/Black
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#3
08-12-2011, 12:37 AM
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I tried a generic one time on my 91 300CE and the installation with the 4-wire splicing kit was a pain. I didn't do the best job splicing and the connection failed after being contaminated with ATF.
The cost of a generic vs. OEM Bosch seems to have narrowed so the OEM is well worth the small additional cost. It is the correct length and has the rubber stopper.
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#4
08-12-2011, 01:45 AM
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I am seeing Bosch direct fit/non-generic for about $118, only a $30 to $40 premium over the generics, so I agree it is worth the additional cost.
Word to the wise: There is no way a $50, no-brand, eBay sensor is a quality part. (Lesson learned.) 
__________________
2008 E350 4matic / Black/Anthracite ------------------------------------ Gone but not Forgotten: 2001 E430 4matic, 206,xxx miles, Black/Charcoal 1995 E320, 252,xxx miles, Black/Grey 1989 260E, 223,00 miles, Black/Black
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#5
08-12-2011, 01:58 AM
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I see the Bosch OEM at $97 and the Bosch Universal 4 wire and (lame) splicing kit at $82.
From what I have read, oxygen sensors are sensitive to small variations in voltage, so if you use the universal, you have to make a very good splice. BTDT with ebay parts. Can't count the hours I have wasted with ebay parts.
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#6
08-12-2011, 08:51 AM
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I definitely will not be splicing -- and am considering have it installed by a local shop for $50, since I do not want the "seized bolt" syndrome I always encounter with every DIY job. (However, because this sensor is only 3 weeks old, removing it should not be too troublesome, despite it not having anti-seize paste pre-installed.)
I checked the wires for corrosion or defects and found none, although the signal wire connector seemed loose and disconnected without being pulled. The connectors were also not replaced securely into the bracket by the installer but I don't know if that amounts to much. Hopefully it is just a faulty sensor and nothing else.
__________________
2008 E350 4matic / Black/Anthracite ------------------------------------ Gone but not Forgotten: 2001 E430 4matic, 206,xxx miles, Black/Charcoal 1995 E320, 252,xxx miles, Black/Grey 1989 260E, 223,00 miles, Black/Black
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