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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 11-14-2012, 02:07 PM
xchudyxpl xchudyxpl is offline
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Location: USA
 
Join Date: Apr 2008
Posts: 128
Mein Auto: 2002 530i & 2008 X5
Engine fail safe

Hi, guys

Here is the story in the nut shell. Today I replaced MAF sensor on my 2002 530i with the cheap aftermarket part ($30). After the replacement SAS light went out. After driving couple of times everything was fine until ENGINE FAIL SAFE appeared and cars throttle was not responsive at all.

Here are my thoughts:
I know that electrical parts should be OEM (times are hard wanted to save money)
The engine fail safe went off after I restarted the car.

My prediction is that the new aftermarket MAF sensor is throwing off the computer and causing this mess.

Please advise, I still have the original MAF sensor which I can put pack any time.
Is there any danger with having aftermarket MAF sensor installed?

Please advise.

Thanks,
Paul
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  #2  
Old 11-14-2012, 02:14 PM
Psalm11_6 Psalm11_6 is offline
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Location: Kansas
 
Join Date: Oct 2012
Posts: 56
Mein Auto: 98 540iA Sport
Out of curiousity, which brand did you go with on the MAF?

I would say it's unlikely that you're going to cause lasting damage simply by cheaping out on this particular sensor. It CAN (and likely will) adversely effect the performance as the MAF is used to help determine air/fuel mixture ratio. I don't have any experience with janky MAF's, but I'd imagine there's a high probability of running either richer or leaner than expected, either way resulting in some overall oddities (depending on HOW rich or lean it gets).
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  #3  
Old 11-14-2012, 02:23 PM
xchudyxpl xchudyxpl is offline
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There is no brand I purchased the sensor form e-buy (Chinese of course).
When it comes to engine fail safe, it never happened to me before. With that being said this happening in the same day when I changed the sensor seems a little odd. That's the reason I started the conversation in order to get some feed back.
Possibly share of similar sympthoms.
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  #4  
Old 11-14-2012, 03:17 PM
xchudyxpl xchudyxpl is offline
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Any ideas guys?
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  #5  
Old 11-14-2012, 03:29 PM
moots's Avatar
moots moots is offline
wat's dat noise
Location: Malaysia
 
Join Date: Apr 2005
Posts: 451
Mein Auto: '97 528i
try putting back the original maf sensor and see if the sas comes back and engine fail safe goes away......if they do then it's the crappy $30 sensor.....
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  #6  
Old 11-14-2012, 03:37 PM
xchudyxpl xchudyxpl is offline
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I will see what happens tomorrow. My only concern is while the cheap MAF sensor is installed can it cause any damage to the electrical system or what not?
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  #7  
Old 11-14-2012, 05:14 PM
moots's Avatar
moots moots is offline
wat's dat noise
Location: Malaysia
 
Join Date: Apr 2005
Posts: 451
Mein Auto: '97 528i
well that is anybody's guess.i'd rather be safe than sorry....
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  #8  
Old 11-15-2012, 04:39 PM
xchudyxpl xchudyxpl is offline
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Mein Auto: 2002 530i & 2008 X5
Here is the update, the engine fail safe did not come back however, the check engine came back (assuming the $30 sensor is a piece of junk)
Will put the original back during the weekend and see what happens.
Again, I do not have any air leaks my only assumption is that MAF sensor is bad.
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