rshelton

Bought a 2009 ML 320 a few weeks ago and recently got the glow plug controller CEL. While attempting to locate the controller, I came across this, not plugged in to anything, any ideas what it is? Or where it goes? Says "A 023 545 53 26" on it.

Thanks!

N_Jay

From a quick Google search, I bet it connects to the water sensor in the fuel filter,

06e320cdi

BTW, that fuel filter looks like its never been changed. S/B every 20K miles

jwong

While finishing up the oil cooler seal job on my 09 GL320 and I found a connector with the same part # "A 023 545 53 26" too. I spent about 45 minutes trying to figure out where it should be plugged into. I don't recall seeing it when I yanked the wire bundle off. I did a search and it lead me to this thread. Since N_jay mentioned about the water sensor in the fuel filter which reminded me the part guy at the dealer gave me a wrong filter at the counter and he asked me if mine had 2 or 3 wires. I think it is for the other filter with 3-wire connector. I just want to update this thread for someone who may have the same question. can we use the other filter...just curious

N_Jay

So, Are you saying the wiring harness (at least some) have connectors for either type of sensor?

jwong

Yes, it is exactly like the pic posted by the OP. I looked at my 07 E320 and I did not see one in there. Part guy at dealer told me MB use 2 different filters(2 or 3 wires). since it is near the filter and I assume it is for that filter.

N_Jay

So in this case the 2-pin is on the filter and the 3-pin hangs loose waiting??

jwong

I talked to the guy at MB parts dept again he said it was either 3 or 5 pins. google found 3 types of filter. Sorry, it was my mistake by saying it was 2-pin. I gave him the part # A 023 545 53 26 and he said it was a pressure connector housing. it doesn't indicate what pressure sensor it is for on the system. At the mean time I'll just let it dangling there until I finish my AC compressor installation this weekend and then hook it up to DAS to see what it would say.

jwong

Update: Just shove it aside...SDS did not see any fault code.