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1992 300D 2.5T (124.128) 1999 S320 SWB (140.032) 1999 E320 4Matic (210.082) 1984 300CD (123.153)
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177 Posts
Discussion Starter #1
I have looked and cannot find any confirmation on this. I need to replace oxygen sensors in the E320, and I am new to this V6. Every Mercedes I have ever owned has had an in-line engine. It is very easy to tell which cylinder is number one on an in-line engine, and subsequently, there is only one cylinder bank so, no problems there.

On this V6 however, there are two cylinder banks, and I know that the number one cylinder is usually in bank 1, but I don't know which cylinder number one is (front left or front right)?? I need to replace my bank 1 sensor 1 and sensor 2. I have found that sensor 2 is the same for left and right, but sensor 1 is different per side. So, is bank 1 on the left (driver) side or right (passenger) side.

I say driver and passenger, but realize that I am in the US (left hand drive cars), so don't confuse me UK and Australia members :D
 

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2001 E430 4matic
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419 Posts
When you stand at the front of the car and looking at the engine, passenger side is bank1, driver side is bank 2.

The cyl 1 is on the bank 1 towards the front of the car, the next behind it is 2, and the one by the firewall is cyl 3.

The cyl 4 is on the bank 2 towards the front of the car(driver side), the next behind it is 5 and the one by the firewall is 6.
 

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Registered
1992 300D 2.5T (124.128) 1999 S320 SWB (140.032) 1999 E320 4Matic (210.082) 1984 300CD (123.153)
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177 Posts
Discussion Starter #3
Thank-you for the thorough response. Very helpful.
 

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'01-E320 & 02-ST2
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31,631 Posts
You'll find lots of great stuff if you take the time to read through the sticky topics. (Heck, there's even a picture of the Bank 2 Position 1 sensor in there.) ;)

BTW, you have four of those sensors, too.

Good luck.
 
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