S40 (New) Engine 2.0D : - P0103 MAF Fault

nbuuifx · Jul 14th, 2012, 12:59

Has anybody had the above fault?

If so what did you to rectify?

Did you notice any problems?

I just scanned my car with my OBDII tool (first time during my ownership of the car 6 months, due to not being able to find the OBDII tool!)

That code pops up, if the engine is running it won't clear it's just there straight away. With the engine off it does clear but as soon as you start the engine the code returns - So I take it it's doing the fault all the time.

v40bart · Jul 14th, 2012, 17:48

Mass Air Flow sensor is playing up, if its a diesel clean the throttle body if petrol replace the sensor...

nbuuifx · Jul 14th, 2012, 19:52

Thanks it's a 2.0d. How does cleaning the throttle body fix it?

Just interested to learn!

v40bart · Jul 14th, 2012, 21:59

It just might have a lot of crud on the filament causing it to read incorrectly out of preset range. It works on the principle of resistance, a current goes through the filament causing it to heat up which in turn gets cooled by flowing air. Resulting filament temperature translates to resistance (which changes with conductors temperature) and ECU reads that as certain amount of flowing air is needed to achieve certain temperature etc. If cleaning doesn't help it's borked.

nbuuifx · Jul 14th, 2012, 22:05

Isn't the MAF sensor separate to the Throttle body though?

I'll give the MAF sensor a quick clean with some IPA, but do I need to clean the throttle body too?

Forgot to say - not noticed any negative side effects, but I do have lowish MPG - although poor journey styles would account for that.

v40bart · Jul 14th, 2012, 22:59

Might as well do the lot.

Jul 14th, 2012, 12:59	#1
nbuuifx Senior Member Last Online: May 1st, 2015 23:01 Join Date: Dec 2011 Location: Staffs	P0103 MAF Fault Has anybody had the above fault? If so what did you to rectify? Did you notice any problems? I just scanned my car with my OBDII tool (first time during my ownership of the car 6 months, due to not being able to find the OBDII tool!) That code pops up, if the engine is running it won't clear it's just there straight away. With the engine off it does clear but as soon as you start the engine the code returns - So I take it it's doing the fault all the time.

Jul 14th, 2012, 17:48	#2
v40bart Master Member Last Online: Jun 14th, 2015 13:09 Join Date: Sep 2006 Location: London	Mass Air Flow sensor is playing up, if its a diesel clean the throttle body if petrol replace the sensor... __________________ 2008 V50 2.0 D, silver, off-black leather interior, plod spec 320mm brakes and suspension, says 140 ps on the sticker but flies like proverbial off a shovell. NICE...

Jul 14th, 2012, 21:59	#4
v40bart Master Member Last Online: Jun 14th, 2015 13:09 Join Date: Sep 2006 Location: London	It just might have a lot of crud on the filament causing it to read incorrectly out of preset range. It works on the principle of resistance, a current goes through the filament causing it to heat up which in turn gets cooled by flowing air. Resulting filament temperature translates to resistance (which changes with conductors temperature) and ECU reads that as certain amount of flowing air is needed to achieve certain temperature etc. If cleaning doesn't help it's borked. __________________ 2008 V50 2.0 D, silver, off-black leather interior, plod spec 320mm brakes and suspension, says 140 ps on the sticker but flies like proverbial off a shovell. NICE...

Jul 14th, 2012, 22:59	#6
v40bart Master Member Last Online: Jun 14th, 2015 13:09 Join Date: Sep 2006 Location: London	Might as well do the lot. __________________ 2008 V50 2.0 D, silver, off-black leather interior, plod spec 320mm brakes and suspension, says 140 ps on the sticker but flies like proverbial off a shovell. NICE...

Jul 14th, 2012, 19:52	#3
nbuuifx Senior Member Last Online: May 1st, 2015 23:01 Join Date: Dec 2011 Location: Staffs	Thanks it's a 2.0d. How does cleaning the throttle body fix it? Just interested to learn!

Jul 14th, 2012, 22:05	#5
nbuuifx Senior Member Last Online: May 1st, 2015 23:01 Join Date: Dec 2011 Location: Staffs	Isn't the MAF sensor separate to the Throttle body though? I'll give the MAF sensor a quick clean with some IPA, but do I need to clean the throttle body too? Forgot to say - not noticed any negative side effects, but I do have lowish MPG - although poor journey styles would account for that.

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