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  #1  
Old 09-06-2017, 08:39 PM
ROLLGUY's Avatar
ROLLGUY
 
Join Date: Oct 2007
Posts: 7,229
'07 W211 E320- P0544 code

My friend just got an '07 E320 (replacement for identical crashed car), and it threw a P0544 code= Bank one sensor circuit exhaust gas temperature sensor. Anyone know where that is located on this car? Is it something that can be cleaned? The car has a warranty, but was purchased out of state. It may be more of a hassle to deal with the warranty if it is something simple or inexpensive to fix. I have not checked to see if it has the famous "oil cooler seal" leak (80,000 miles on the car), but if it does, it will be under warranty. If so, the sensor problem will get fixed at the same time......Rich

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  #2  
Old 09-06-2017, 09:37 PM
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Control Freak
 
Join Date: Oct 2011
Location: Columbia, SC
Posts: 3,941
EGT sensors are under the car with the cat. Easy to get to once it's up in the air.

There are two temperature sensors and a differential pressure sensor. The temperature sensors thread into the pipe ahead of the cat, and the cat body itself. The delta P has two hoses on two pipe stubs to a module tucked away near the cat.

When ours went out (threw the same code IIRC) on the 08 I just went ahead and replaced both, since I wasn't sure, despite having WIS, which one it was. I did not have my Star computer at that time. I figured that if one died, the other was about to follow.

I think the sensors ran about $100 each.

I hit the nuts with a little AeroKroil and they backed right out. Easy Peasy. The wires are permanently attached to the sensor, and the other end goes to a harness plug tucked away near the engine.

The wiring was a little fussy getting it routed and clipped back into position but other than that, took me about an hour.

Pro tip - that cat gets HOT and stays HOT for a long time...
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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech
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  #3  
Old 09-06-2017, 10:25 PM
jay_bob's Avatar
Control Freak
 
Join Date: Oct 2011
Location: Columbia, SC
Posts: 3,941
One more thing that should be done on principle to a 10 year old OM642:

http://www.peachparts.com/shopforum/diesel-discussion/378195-om-642-camshaft-position-sensor-replacement.html

Simple to change but if it fails you are dead in the water.

__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech
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