Fault Codes.......

Trueblue1872

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Hello again folks,

after getting an intermittent engine management light on my w203 c180 Kompressor i decided to dive in at the deep end and purchase an OBD2 Scanner tool. i have been since still getting the intermittent light after clearing the codes. they are as follows:-

P0101- Mass/Volume air flow A circuit range performance
P0102- Mass/Volume air flow A circuit low
P0172- System too Rich Bank 1
P0171- System too Lean Bank 1

my question is this, all of my ideas point to a fault MAF sensor, but i was wondering could the problem be caused by an oil leak?

any info would be greatly appreciated.

thanks guys!!
 

Uncle Benz

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On an M271 I would be checking thoroughly for split or perished breather hoses first.
 
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Trueblue1872

Trueblue1872

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Ok so all the hoses should be checked and thats maybe causing an air leak
 

Uncle Benz

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Yup. The air mass will register as low if a leak exists downstream of the maf. Consequently the fuelling will all be to cock. Could still be a faulty maf, but eliminate the cheaper stuff first ;)
 

Uncle Benz

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You mention an oil leak... If you have a hole big enough it can also be letting air in via the breathers and messing it up the same
 
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Trueblue1872

Trueblue1872

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Ok well my fuel MPG is ridiculous and my shifting through the gears isnt very smooth at all.
 
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Trueblue1872

Trueblue1872

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Where the MAF is situated in the w203 c180 is a bit kf a pain to get to also
 
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Trueblue1872

Trueblue1872

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also with regards to the oil leak my suspicion is that it may be coming from the camshaft magnets located at the front of the engine
 

Oldspanners

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also with regards to the oil leak my suspicion is that it may be coming from the camshaft magnets located at the front of the engine
That could be the source of your problems if the oil is wicking into the wiring harness. Check the connector at the ECU and at the post CAT O2 sensor (the lowest point) for any oil contamination.
I chased a fault on mine for a few months with this.
 
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Trueblue1872

Trueblue1872

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Ye i think this is the problem becausr the area in and around the camshaft magnets is thick with oil.
 

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