I was completing some General Maintenance on my ml this weekend, Air filters, Oil change, Cabin Air filter & the following day after about 50-60k of driving my Engine light came on showing a P20BE code. I cleared the code & immediately received a Check add blue on the display, Ad Blue was low, so I added . Code came back a few km later. Searching the forum it looks like this code is related to the reductant heater for the add blue, but I also see a couple people who also have pump and processor failure. One post noted this code started after change the Air filters / Cabin air filter, which I also just changed... not sure if this is just a coincidence.......
Is there some way to test the reductant heater to ensure that is the only issue before I purchase the rebuild kit?
Thanks in advance!!
Is there some way to test the reductant heater to ensure that is the only issue before I purchase the rebuild kit?
Thanks in advance!!