Which O2 Sensor is this?
Thread Starter
Newbie
Joined: Jul 2007
Posts: 12
Likes: 0
From: PHX, AZ USA
2003 C320 Sport
Which O2 Sensor is this?
Hello,
I've done a lot of searching and here is what I discovered so far. I have an error code of P0134 which I found to be:
O2 sensor circuit - No activity detected (Bank 1 Sensor 1)
What I can't find is which O2 sensor is this and where is it located? Plan to replace. I have an 03 C320. Thanks in advance!!
I've done a lot of searching and here is what I discovered so far. I have an error code of P0134 which I found to be:
O2 sensor circuit - No activity detected (Bank 1 Sensor 1)
What I can't find is which O2 sensor is this and where is it located? Plan to replace. I have an 03 C320. Thanks in advance!!
Senior Member
Joined: May 2007
Posts: 355
Likes: 0
From: Hong Kong/Charlotte
2010 C63
If no activity is detected, the sensor is likely disconnected or the wire has been cut or shorted. Look for the sensor with the loose / broken wire.
Sensors are numbered sequentially from the engine, so sensor 1 is closest to the engine, before the cat. Not sure if Bank 1 is the left or right side of the engine.
Sensors are numbered sequentially from the engine, so sensor 1 is closest to the engine, before the cat. Not sure if Bank 1 is the left or right side of the engine.
Super Moderator
Joined: Jun 2008
Posts: 19,942
Likes: 191
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Super Member
Joined: Aug 2009
Posts: 983
Likes: 2
From: USA
Marsaydees
Trending Topics
MB World Stories
The Best of Mercedes & AMG
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
Mercedes Teases Updated EQS With Steer-By-Wire and a Yoke
Verdad Gallardo
8 Mercedes Models With Poor Reliability Records
Verdad Gallardo
Super Moderator
Joined: Jun 2008
Posts: 19,942
Likes: 191
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Correct - but the passenger side does - see post 
I'm always amused at people saying I'm going to do something in the autumn or the summer - The autumn or the summer where? Northern or Southern hemisphere. I guess my global job made me picky.
I'm always amused at people saying I'm going to do something in the autumn or the summer - The autumn or the summer where? Northern or Southern hemisphere. I guess my global job made me picky.
Last edited by Glyn M Ruck; Aug 16, 2009 at 10:52 AM.
Thread Starter
Newbie
Joined: Jul 2007
Posts: 12
Likes: 0
From: PHX, AZ USA
2003 C320 Sport
Well, looks like wires and connecter are ok so I guess the O2 sensor is dead in the water. The car has almost 75k miles and sound like that is when they start going bad. Going to order one. One more question, Online part stores list the O2's right side and left side. I'm guessing left side is the passenger side?
Super Moderator
Joined: Jun 2008
Posts: 19,942
Likes: 191
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
LHS = Drivers side USA - and to confuse you here are the P/Ns as listed by Benz for C320
0015400717 001 L OXYGEN SENSOR LEFT,UPSTREAM CATALYTIC CONVERTER
0015408717 001 R OXYGEN SENSOR LEFT,UPSTREAM CATALYTIC CONVERTER
0015405017 001 OXYGEN SENSOR RIGHT,UPSTREAM CATALYTIC CONVERTER
0015404617 001 OXYGEN SENSOR LEFT,DOWNSTREAM CATALYTIC CONVERTER
0015404617 001 OXYGEN SENSOR RIGHT,DOWNSTREAM CATALYTIC CONVERTER
0015400717 001 L OXYGEN SENSOR LEFT,UPSTREAM CATALYTIC CONVERTER
0015408717 001 R OXYGEN SENSOR LEFT,UPSTREAM CATALYTIC CONVERTER
0015405017 001 OXYGEN SENSOR RIGHT,UPSTREAM CATALYTIC CONVERTER
0015404617 001 OXYGEN SENSOR LEFT,DOWNSTREAM CATALYTIC CONVERTER
0015404617 001 OXYGEN SENSOR RIGHT,DOWNSTREAM CATALYTIC CONVERTER
Super Moderator
Joined: Jun 2008
Posts: 19,942
Likes: 191
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
OBDII/CAN regime dictates that Bank 1 is always the bank that contains Cylinder 1.
The different sensors upstream for "L" & "R" denotes whether the car is Left Hand Drive or Right Hand Drive. I think the only difference in the sensors is the length of the pigtale to clear the steering column & plug into the engine harness.
The different sensors upstream for "L" & "R" denotes whether the car is Left Hand Drive or Right Hand Drive. I think the only difference in the sensors is the length of the pigtale to clear the steering column & plug into the engine harness.
Last edited by Glyn M Ruck; Aug 18, 2009 at 04:01 AM.
Senior Member
Joined: Aug 2002
Posts: 490
Likes: 1
From: Canada
05 CLK 500 cab
Lack of room? If so, this could be the moment to invest in a set of crowsfoot wrenches. A crowsfoot looks like an open-end wrench but is very short and fits on the end of a socket extension.
Thread Starter
Newbie
Joined: Jul 2007
Posts: 12
Likes: 0
From: PHX, AZ USA
2003 C320 Sport
Lack of room to get any strength on it plus it's on there tight!! Never heard of crowsfoot. Thinking of just finding a shop to do a quick swap for me. Probably still charge me a ton for 10 minutes of work.
Thread Starter
Newbie
Joined: Jul 2007
Posts: 12
Likes: 0
From: PHX, AZ USA
2003 C320 Sport
Thanks Lars and Glyn!! I would love to put a hammer to it but don’t even know how to hit it. What about a crowsfoot with about 3 feet of extension from up top? anybody try this? so close but yet so far!!!
Last edited by Scubbs; Aug 18, 2009 at 09:53 PM.
Super Moderator
Joined: Jun 2008
Posts: 19,942
Likes: 191
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
It's usually 22mm - measure your new one to check. Here is the Merc special tool for American 3/8 ? drives.
Edit - Costs about 20 bucks - available at many online specialty tool suppliers.
Edit - Costs about 20 bucks - available at many online specialty tool suppliers.
Last edited by Glyn M Ruck; Aug 19, 2009 at 07:12 AM.
Banned
Joined: Apr 2008
Posts: 910
Likes: 2
From: In Kush Land So cal
02 C320 Sedan
