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New mass air flow meter


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#1 stevie2810

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Posted 13 May 2018 - 05:25 PM

I got an engine warning message last week on my 2005  2.0 HDi (80,000 miles on the clock) and the orange engine light appeared on the dash. I drove the few miles home. The engine is running fine and the orange warning light had disappeared by the next day. However, I decided to get the local Citroen dealer to diagnose the fault.

 

I was told that the car requires a "new mass air flow meter and brake switch". Could this possibly be a false alarm (dirty air filter maybe) and can the air flow meter be cleaned?

 

If these parts do have to be replaced, I'd like to do the work myself, as it looks like both items are a simple exchange - please correct me if I'm wrong. The brake switch is fairly inexpensive but the prices for the air flow meter vary from £25 to £85. Are the cheap ones OK? Here's a typical cheapo: <https://www.ebay.co....oAAOSweARZchMM>

 

 

TIA.



#2 gray

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Posted 14 May 2018 - 08:11 AM

Cheap ones don't tend to last long (anecdotally - I've not had one changed on this car, but did on a Fiat).

 

Both are easy enough to replace, once you work out how to setup and adjust the brake switch...  it's a ratchet type thing, from memory.



#3 ChrisGibbard

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Posted 14 May 2018 - 08:52 AM

MAF can be cleaned, plenty of videos on youtube, but you can also run your car with it unplugged! I did for ages. Usually if it packs up altogether the car goes in "limp mode". Which is what mine did. You didn't get that, and now all is ok. So I'd give it a clean and change the brake switch if you really feel like it.


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#4 stevie2810

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Posted 16 May 2018 - 02:34 PM

Many thanks, Gray and Chris. That's exactly what I need to know.



#5 stevie2810

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Posted 08 June 2018 - 05:07 PM

I cleaned the MAF sensor last week with some Halfords electrical cleaning spray, as explained on the web. Unfortunately, the engine warning message came back yesterday together with the orange engine light. I paid close attention: there were no symptoms. The engine performed as usual. I am also getting my normal fuel consumption. I'm tempted to ignore it. Is there any reason why I shouldn't?



#6 stevie2810

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Posted 08 June 2018 - 05:08 PM

Duplicate post. I tried to delete it but I couldn't see any way of doing it.


Edited by stevie2810, 08 June 2018 - 05:10 PM.


#7 Marvin

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Posted 08 June 2018 - 07:41 PM

Well,  you could ignore it for a while,  but you'll have to get the light out before your next MoT as it's grounds for failure.



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#8 stevie2810

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Posted 09 June 2018 - 12:02 PM

Oh, that puts the cat among the pigeons. The MOT is due soon. Thanks for pointing that out, Marvin.



#9 stevie2810

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Posted 09 June 2018 - 02:43 PM

Well, well. I started the car this morning and the yellow engine light was gone. It's playing games with me. :mellow: Does anyone know what's going on?
 



#10 discv

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Posted 09 June 2018 - 05:29 PM

From your posts I see no mention of the fault code/s being cleared. A cheapo code reader and clearer would be a good investment.

 

If the MIL has been left to clear itself, it can take a couple of cycles before it extinguishes. all of which suggests that your diy cleaning might have been successful!


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C4 Grand Picasso 1.6 HDi 16V FAP/DPFS 110, -Auto (DV6 - 80kW) (C4) (DT) (2008)

 


#11 stevie2810

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Posted 10 June 2018 - 05:30 PM

The fault has occured twice, discv, and has cleared twice by itself. I did a 100-mile round trip yesterday and after 40 miles the Engine Fault came on and the orange engine warning light reappeared. This time my speed was throttled to 60mph for about three minutes and then went back to normal. On the return journey that evening the light stayed on. I started the car this morning and the light was gone. That now makes three times the light has come on and gone off by itself. I'm stumped.



#12 discv

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Posted 10 June 2018 - 06:05 PM

What is the fault code/s.


C4 Grand Picasso 1.6 HDi 16V FAP/DPFS 110, -Auto (DV6 - 80kW) (C4) (DT) (2008)

 


#13 stevie2810

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Posted 10 June 2018 - 06:47 PM

I don't know what the code is, discv. I took the car to the local Citroen dealer the first time this happened. They read it and told me it was the MAF meter. They also quoted me a silly price for replacing it - which is why I'm trying to figure out what to do next. I'd never heard of a MAF meter until a couple of weeks ago. :-)

 



#14 gray

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Posted 11 June 2018 - 11:27 AM

Just a mismatch of terminology by the Dealer... https://www.carsdire...ars-performance

A new MAF isn't too much, and is easy to fit. Maybe it's just starting to fail - if the dealer was right.... ?

I got a code reader off EBay (or Amazon) for just over £5 at the time, so as DiscV says above, invest in one of those to do your own readings.
https://www.amazon.c...r/dp/B001CBBY7O

Edited by gray, 11 June 2018 - 11:32 AM.

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#15 stevie2810

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Posted 16 June 2018 - 12:19 PM

That's useful information, gray. Thanks!

 

The engine warning light has stayed off for the past week - so hopefully it's sorted for the time being. As the car has never shown any of the usual symptoms of a faulty MAF meter, I think discv is probably right: my DIY cleaning did the trick. However, I'm going to buy a code reader, just in case. Thanks to everyone for their invaluable tips.


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#16 stevie2810

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Posted 12 July 2018 - 10:01 AM

Just a quick update. The engine light has stayed off for the past month - no problem. I can therefore recommend cleaning the MAF filter with a suitable spray to anyone with the same problem who comes across this thread.


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#17 PJS54

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Posted 12 July 2018 - 08:53 PM

My orange warning light came on shortly after I bought my 2004 Xsara Picasso and the fault code showed up as the mass air flow sensor. A week later it came on again and pointed to a diesel injector problem. These both turned out to be complete red herrings, as the real fault turned out to be a sticking EGR valve. I'd get it cleaned out and within two weeks it was sticking again. I wasted money on all kinds of cleaning gunk to no avail, but then I heard about the magic solution of buying a slot-in sheet off eBay to bypass the bloody thing altogether. It cost about two quid and a local Citroen specialist (not a dealer) fitted for a very small amount. After that it ran perfectly for several years, until just recently it started happening again. This time it turned out to be some kind of accelerator pedal position sensor, which calculates the mpg among other things. Simply wiggling and lubricating it seemed to do the job. I suspect that one other cause of the orange light coming on at start-up, is if you switch straight on when the battery level is low (I was getting the two warning bongs). The latter is just speculation, but I came to think that the best cure for the problem is a piece of black tape over the warning light.  :lol:


Edited by PJS54, 12 July 2018 - 08:55 PM.