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'04 G55 '80 280GE '99 S420 '98 E320 2011 E350 2016 GLA250
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3,093 Posts
Discussion Starter #1
Reading a post below, asking about Upstream O2 Sensor Location... It reminded me to write up my job I did a while back.


During my quest to resolve my occasional rough idle, and rare P0410 code... I was advised I should change my original 160,000 old O2 sensors, since Rough idle and P0410 "CAN" be associated with both, even though it does not trigger a O2 sensor fault code.

After going to my friendly local dealership.... I needed a clean set of Undies after seeing the prices. Since I KNOW the MB part is a Bosch origin, I thought I would cut out the middle-man.

I am embarrassed to admit it... but THEEEE cheapest Sensors I found were on Amazon.com!! Quick easy free shipping. The Sensors came Pre-Lubed with the High temp Paste.

Although I have posted a Left-Rear DIY, that is easy-schmeeezy. The front ones were a bit of a challenge.

REMEMBER- THIS POST IS FOR A 1999 S420!! Obviously, double-check the correct part number for your Model/Year.
 

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1997 S420
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341 Posts
I know this thread is old- but I think you mixed up the pictures of the connectors for the LEFT FRONT and LEFT REAR. My LEFT FRONT was plugged in to the connector coming out of the body in post #1 Picture #5. My LEFT REAR was connected in the junction shown on post #2 Picture #6.
 

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1998 S320LWB
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654 Posts
Is it correct that the front O2 sensor is the important one to be changed as that is the sensor which provided signal to the ECU. Whereas, the rear sensor (after the CAT) would only be used to trigger the check engine light. Based upon that logic I changed my front sensor at 110K miles but my rear sensor is original at 172K miles. Sound reasonable?

Shim
 

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1997 S420
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341 Posts
Is it correct that the front O2 sensor is the important one to be changed as that is the sensor which provided signal to the ECU. Whereas, the rear sensor (after the CAT) would only be used to trigger the check engine light. Based upon that logic I changed my front sensor at 110K miles but my rear sensor is original at 172K miles. Sound reasonable?

Shim
I just fixed my CE light. I had P0135 (Bank 1 Sensor 1) Which is the FRONT LEFT (Before CAT), P0150 (Bank 2 sensor 1) (Sensor malfunction- the PO has the sensor unplugged the whole time :p) FRONT RIGHT (Before CAT) and P0155 (Bank 2 sensor 1) FRONT RIGHT (Before CAT). From what I heard, the front two sensors (Before CAT) adjust the air/fuel ratio in the ECU. I replaced both before CAT sensors and my check engine light went away.
 

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'04 G55 '80 280GE '99 S420 '98 E320 2011 E350 2016 GLA250
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3,093 Posts
Discussion Starter #9
I know this thread is old- but I think you mixed up the pictures of the connectors for the LEFT FRONT and LEFT REAR. My LEFT FRONT was plugged in to the connector coming out of the body in post #1 Picture #5. My LEFT REAR was connected in the junction shown on post #2 Picture #6.
No, everything is posted correctly.
 

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'04 G55 '80 280GE '99 S420 '98 E320 2011 E350 2016 GLA250
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3,093 Posts
Discussion Starter #12
G,

What is the Mercedes special tool number for that Hazet 4680-2 socket?

Although Hazet Designed 4680-2 to be used on MB, there is No M-B part number for it.
 

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1996 S500 Sedan with 250,000 KM badge! 2007 CKL350 Triple-black cabriolet
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38 Posts
Sorry to add a BUMP after so long, but :
1) Thanks for the photo DIY!
2) and what Einstein at MB came up with the placement of the Front Right sensor?!?!?! 30 degrees left or right would have made it a simple fix... as is, O...M...G....
3) Best to let people know "LONG" extension means 24-30"!!! And a swivel joint and a few varying lengths are highly advised, as too long and you bump the lip of the engine compartment above, and too short and it doesn't reach!! Two people saves 30 minutes of jumping above/below/above/below to get the $%@@$##! socket on!
4) And not every Hazel/Crow's foot wrench will work either: you need a very slim, vertical one! I got one and sure enough: it was 1/4" too wide to fit in the most awkwardly designed space on the whole car.

This one is honestly enough to make me suggest paying a shop to do it and save your back/arms/sanity! :p
 

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1996 S500 Sedan with 250,000 KM badge! 2007 CKL350 Triple-black cabriolet
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38 Posts
Had to share this - after 2 days working on this job... but I did it!!! :)
 

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