MAF & Oxygen Levels

Lukerchrdsn · Mar 25th, 2019, 07:57

Hi All,

Believe this to be a very common one having read a few threads on here. Driving back to home to Sheffield from London yesterday afternoon - the 'engine management service required' light came on. I suspected it might be either oil level - or swirl flaps (as have had these sorted in the past 6 months).
However, this time the codes read Mass Airflow Sensor & Oxygen Levels. I have cleared the fault codes to see if they re-appear.

My concern is that we have planned a long drive to heathrow for holidays this coming Saturday. I'm guessing I should get the car properly diagnosed before doing the 300+ mile round trip!? I see there are a number of possible causes (intercooler leak etc) Any thoughts really appreciated. :-)

gmonag · Mar 25th, 2019, 08:49

What model/year? How did you read the codes? Generic code readers can mislead you - VIDA is the best/only real option, otherwise you may be barking up the wrong tree.

However a visual inspection would not hurt. Check for induction leaks as you suggest by listening for whistles/hissing whilst the engine is running. If you can get a smoke machine, that will help.

Lukerchrdsn · Mar 25th, 2019, 10:37

Hi it is Volvo XC90 2008 D5. I invested in a iCarsoft i906 scanner off the back of recommendations on here. VIDA sounded a bit too complicated for me!

SwissXC90 · Mar 25th, 2019, 11:49

+1 on intake leak

Don't spend any money on any replacement sensors until you are 1000% sure your intake system has no leaks

Mar 25th, 2019, 07:57	#1
Lukerchrdsn New Member Last Online: Feb 14th, 2024 15:24 Join Date: Sep 2018 Location: Sheffield	MAF & Oxygen Levels Hi All, Believe this to be a very common one having read a few threads on here. Driving back to home to Sheffield from London yesterday afternoon - the 'engine management service required' light came on. I suspected it might be either oil level - or swirl flaps (as have had these sorted in the past 6 months). However, this time the codes read Mass Airflow Sensor & Oxygen Levels. I have cleared the fault codes to see if they re-appear. My concern is that we have planned a long drive to heathrow for holidays this coming Saturday. I'm guessing I should get the car properly diagnosed before doing the 300+ mile round trip!? I see there are a number of possible causes (intercooler leak etc) Any thoughts really appreciated. :-)

Mar 25th, 2019, 08:49	#2
gmonag Premier Member Last Online: Jan 15th, 2024 17:24 Join Date: Jun 2010 Location: Bury St Edmunds	What model/year? How did you read the codes? Generic code readers can mislead you - VIDA is the best/only real option, otherwise you may be barking up the wrong tree. However a visual inspection would not hurt. Check for induction leaks as you suggest by listening for whistles/hissing whilst the engine is running. If you can get a smoke machine, that will help. __________________ Greg

Mar 25th, 2019, 11:49	#4
SwissXC90 Premier Member Last Online: Mar 20th, 2024 18:26 Join Date: Jan 2016 Location: Cross Country	+1 on intake leak Don't spend any money on any replacement sensors until you are 1000% sure your intake system has no leaks __________________ XC90 R-Design MY2009, Black Sapphire Metallic. HP-Sound, RSE, Nav, Tel, ParkingCam, BLIS, ParkingHeater, RestHeat, Removable Towbar, Summer: CRATUS 20x8 on Pirelli Scorpion Zeros 255/45, Winter: NEPTUNE 17x7 on Continental WinterContact 4x4 235/65.

Mar 25th, 2019, 10:37	#3
Lukerchrdsn New Member Last Online: Feb 14th, 2024 15:24 Join Date: Sep 2018 Location: Sheffield	Hi it is Volvo XC90 2008 D5. I invested in a iCarsoft i906 scanner off the back of recommendations on here. VIDA sounded a bit too complicated for me!

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