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      09-22-2014, 11:32 PM   #1
BH_Fanaticos77
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increased emission - 27C5 and 2739 codes

Hi guys, I hope someone can help me with this issue.

I have increased emission / engine service soon warning on. I had someone check the fault codes and I got 27C5 and 2739

description for 2739 says "AIR MASS SENSOR SECONDARY AIR ELECTRICAL DIAGNOSIS"

description for 27C5 says "AIR MASS SENSOR SECONDARY AIR SIGNAL"

It looks like this sensor could be a problem. Has anyone had this type of issue and had it successful fixed? and would you have a part number and diagram for this sensor?

I really appreciate any feedback on this. I tried searching the forum but couldn't find any topics on these codes.

My emission testing is due this month. Great timing
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      10-02-2014, 10:23 PM   #2
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bump. any feedback is greatly appreciated.
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      10-07-2014, 05:09 PM   #3
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weird, the car doesn't have a MAF..

http://bmwclubuae.com/forum/showthre...sor-or-Alpha-N

I would email Mike Benvo and see what he suggests. http://www.bpmsport.com/

Last edited by Flying Ace; 10-07-2014 at 05:14 PM..
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      12-06-2016, 07:21 PM   #4
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For anyone who searches these error codes on M3post, I had both of these codes at the same time. I replaced the air pump suction hose (with included sensor) BMW part #11727838504 and both codes have gone away permanently. BMW doesn't sell the sensor separately, but it is available with aftermarket brands if you think it is the sensor and find no damage/cracks in the hose. Careful about buying this part used. I did that at first on Ebay, but the item was poorly packaged (maybe damaged when shipped in a soft sided envelope) and didn't work (or maybe it was already defective before shipping). I would recommend purchasing this part new.

Link to website I borrowed the image from:


Last edited by Theodore; 01-18-2017 at 08:47 PM..
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      09-15-2017, 07:22 PM   #5
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Any advice on how to replace the hose? I can't get behind the intake manifold and it seems it's bonded in place. Thx!
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      09-15-2017, 08:11 PM   #6
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Quote:
Originally Posted by leo95se View Post
Any advice on how to replace the hose? I can't get behind the intake manifold and it seems it's bonded in place. Thx!
Check out the links in "Step 1" of this DIY to learn how the plenum (aka intake manifold) on this car comes off. It's still a pain to reach back there, but removing the plenum makes it much easier.
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      09-16-2017, 07:27 AM   #7
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Genius! Thanks a ton, really impressive detail by all
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      08-22-2019, 01:01 PM   #8
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Hey I wanted to see if yah can help so these codes keep popping up (2739 - 27C5) on I change the Air Suction Pump Hose already & my engine malfunction light still comes on, any idea what it can be

I look up the codes & it says


description for 2739 says "AIR MASS SENSOR SECONDARY AIR ELECTRICAL DIAGNOSIS"
Secondary Air Injection System Air Flow/Pressure Sensor Circuit High (Bank 1)


description for 27C5 says "AIR MASS SENSOR SECONDARY AIR SIGNAL"
Secondary Air Injection System Air Flow/Pressure Sensor Circuit (Bank 1)
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