my_mclass

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!

ML God

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

StapleGun

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

my_mclass

Thanks..how do I reset the check engine light without disconnecting battery?

ML God

Disconnecting the battery wont erase the code. you need a scan tool to erase it

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,

Radomir

take it to AutoZone (or any other store that has the obd scanner) and ask them to erase the code.

Ron in SC

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

my_mclass

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"

my_mclass

I just found out the hardway the bank 1 sensor 2 is the driver side after-cat sensor.

gshock

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.

monysingh

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.

Luis21

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

farmersgroup

Maj. Dundee

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.