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1999 ML320 O2 Sensor

 
Old 06-14-2005, 10:33 AM
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1999 ML320 O2 Sensor

I have my check engine light on (1999 ML320) and I did the emission test the same day that found the O2 sensor (bank1 sensor2) failed. Where is this located? With an average technical knowledge, can I replace this myself? The dealer said it would cost around $500 including a diagnostic check, and I think that is a rip off.

Also, if I replace this myself, how do I reset the check engine light? I don't want to disconnect the battery because I don't think I have the radio code.
Thanks in advance!
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Old 06-14-2005, 11:08 AM
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i have no idea by bank 1 sensor 2....is it the left or right side? before or after the cat. if it is the rear o2 those are very simple to replace with a 7/8 wrench. the fronts are a little more difficult to get to but do able
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Old 06-14-2005, 11:12 AM
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1967 Morris Cooper "S", 1983 911SC, 1997 Toyota Tacoma, 1999 HD FXSTB, 1998 C43
Source for 02 sensor

For future reference:

Not sure location of which sensor is your problematic one, but here's a possible source for your replacement.

www.oxygen-sensor-warehouse.com
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Old 06-14-2005, 11:25 AM
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Thanks..how do I reset the check engine light without disconnecting battery?
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Old 06-14-2005, 11:47 AM
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Originally Posted by my_mclass
Thanks..how do I reset the check engine light without disconnecting battery?
Disconnecting the battery wont erase the code. you need a scan tool to erase it
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Old 06-14-2005, 01:00 PM
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By the way, the fault codes are P0136 and P0141 - does this say what side O2 sensor and before/after cat?

What is a reasonably priced scan tool that will work with 1999 ML320?

Thanks a lot again,
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Old 06-14-2005, 01:32 PM
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2000 ML 430
take it to AutoZone (or any other store that has the obd scanner) and ask them to erase the code.
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Old 06-14-2005, 02:14 PM
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99 ML 320, 97 Porsche 993 C2S, 92 300E
Bank 1 sensor 2 is a fault with the O2 sensor after the CAT, on the passengers side. I don't think that affects the performance of the vehicle at all. If it's the O2 sensor that failed you don't need to change it it you don't want to. As I understand it the sensor behind the Cat just confirms that the CAT is working properly, it's an emissions thing.

I had code P0156 which is Bank 2 sensor 2, i.e., the O2 sensor after the CAT on the drivers side. I had the code cleared a couple of times and it's not come back since.


Link to Thread on my O2 sensor issure.
http://www.mercedesshop.com/shopforu...ghlight=sensor

Last edited by Ron in SC; 06-14-2005 at 02:16 PM.
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Old 06-14-2005, 04:21 PM
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Alright! I think I've got all my questions answered here. This is a great site, thanks everyone for your input.

"I just saved a bunch of money on my car repair"
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Old 06-15-2005, 12:07 PM
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I just found out the hardway the bank 1 sensor 2 is the driver side after-cat sensor.
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Old 06-16-2005, 12:08 AM
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Originally Posted by my_mclass
By the way, the fault codes are P0136 and P0141 - does this say what side O2 sensor and before/after cat?

What is a reasonably priced scan tool that will work with 1999 ML320?

Thanks a lot again,
I have a 99 and had the same codes. I figured it out to be the Passenger side 02 sensors. I replaced the 02 sensor before the cat and intended to replace the one in the rear but the rear 02 i had was the wrong part number. anyhow, its an ez job to do and I have not had the CEL come on since i changed the 02 before the cat.
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Old 07-11-2009, 12:05 AM
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Mercedes Benz ML320
Hi Everybody,

My ML320 1999 failed the California emission test and the report says: Functional OBD II test completed: Faults detected. P0130-02 Senson fault(bank1 Senson1)

Cab someone help me as to what needs to be done as I am a layman and this is my first ML320

Thanks.
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Old 07-12-2009, 02:09 PM
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Mercedes ML270 cdi
Exclamation ML270 CDI PLEASE HELP !!

I've recently bought a ML270 CDI 52 PLATE and when you put the gear lever into drive it stays in 1st gear. When you shift over to manual mode the icon on the dashboard doesnt tell you anything and stays in 'D'. Therefore it stays in first gear. Please please help me
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Old 12-17-2018, 02:23 PM
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Mercedes 2001 ML320
ML320 2001 bank 2 sensor 1

I need help with instructions of how to replace the upstream oxygen sensor, bank 2 sensor 1, for my ML320. Do I need to remove any engine cover under the car? Can you please tell me how to reach it? Thank you so much.
Originally Posted by ML God View Post
i have no idea by bank 1 sensor 2....is it the left or right side? before or after the cat. if it is the rear o2 those are very simple to replace with a 7/8 wrench. the fronts are a little more difficult to get to but do able
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Old 12-17-2018, 03:07 PM
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2002 ML 320 & 2006 ML500
Bank 2 is the driver's side and you would have to remove the tire and the wheel well liner to gain access.

You will also need the proper wrench. Do not use and open end wrench.

Install the sensor and the CEL should go out. Drive the truck and see if the code returns.

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