4 error Codes Please Help - PeachParts Mercedes-Benz Forum

ismav · #1 03-01-2009, 03:04 PM

Guys,
I have the following error codes on my 1999 ML 320

PO170 Bank 1
PO172 Bank 2
PO700
PO720

I changed the MAF last November when it failed but havent changed the air filter (my bad) the airfilter is an K&N oil based performance filter

I think the MAF is blown again. Could you guys please help it the later 2 codes (po700 and po720) are because of the failed MAF ?/
Thanks in Advance
PS I have a strore All european Auto Supply Inc in Detroit(http://www.alleuro.com/) that seels the BOSC MAF ?? is it good for my Truck

Thanks
vamsi

DUTCH · #2 03-01-2009, 08:03 PM

Quote:

Originally Posted by ismav

Guys,

PS I have a strore All european Auto Supply Inc in Detroit(http://www.alleuro.com/) that seels the BOSC MAF ?? is it good for my Truck

Thanks
vamsi

The MB MAF is a Bosch unit.

Get rid of that K&N Oiled Air Filter if you don't want to have to change MAF's every few thousand miles.

ismav · #3 03-01-2009, 08:31 PM

Thanks Dutch
That will take care of my first 2 codes how about the other 2 (700 & 720)??

Thanks in advance

DUTCH · #4 03-01-2009, 08:40 PM

Quote:

Originally Posted by ismav

Thanks Dutch
That will take care of my first 2 codes how about the other 2 (700 & 720)??

Thanks in advance

Looks like they're transmission related. Generic Codes are as follows:

P0700 Transmission Control System Malfunction

P0720 Output Speed Sensor Circuit Malfunction

M.B. DOC can probably shed more MB specific light on these.

mbdoc · #5 03-02-2009, 08:21 AM

Common issue with the 722.6 trans.

There is a plastic plate ON the valve body that has the speed sensor embedded in it.

Called the conductor plate, MB part number 140-270-08-61 at MB list of $250.

Takes a good tech 1.5-2 hrs to install.