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Smoke in cabin and yellow engine warning light

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Hi guys,


This is actually an F01 but the same N57 engine so thought I'd ask here if anyone experienced similar...


Driving up the road the other day and started to smell smoke. Thought it was the car infront then further along I realised it was coming out of my circulation vents. I pulled over and popped the bonnet and it seems to be coming from the dip stick at the rear of the engine bay (passenger side). Taking the filler cap off showed some smoke coming out of that (white).  Not loads of it but enough to think, is that normal?


I then drove home.  Performance is as normal and no issues.  About 6 miles later the yellow engine dash light came on.  Got home and loaded up ISTA and read the fault codes generated which are as follows:


24CE00 - Hot film air mass meter: ratio of measured to calculated air mass too high



290900 - Air system, air to egr mass flow, plausibility: measured air mass compared with calculated air mass too high.


Does anyone know what the problem may be?  I reset the fault codes and the light went out, yet it comes back on after several miles of runabout.


I've been out several times since and it seems fine except each time I reset the fault it eventually comes back on, so something is up.  I'm not getting smoke in the cabin any longer however.


thanks in advance.

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Could be a leek in the air pipe near the egr  allowing the air exhaust mixture to escape and find its way to the cabin air inlet. 

Had this with a bmw engine before, the smell was worse when stationary. 

The egr valve may be due for a good clean. 

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19 minutes ago, Cavester said:

I'll try and get to the Indy tomorrow and see what they say.  What's the remedy for a coolant leak into the egr?


Replace the EGR valve. The coolant leak, if this is where the problem lies, will come from the EGR cooler which is purchased as a unit along with the EGR valve itself.

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