BMW 1-Series Forum (F20) 135i - 1Addicts.com > Second Generation 1 Series Forum > 2012 BMW 1-Series Sporthatch (F20) Discussion > Fault code issue
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      07-30-2022, 09:47 AM   #1
Cedric1234
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Fault code issue

I am currently still having even after the things done below, 2 fault code, 290900 (air mass system: measured air too high) and 2AB500 (Boost pressure sensor, signal: Too low (implausible relative to pressure upstream of turbine and ambient pressure).

things that have been change/done/check
EGR valve changed, turbo rebuilt, clearing of soot (intake manifold), MAF sensor checked, charge air pressure sensor changed, check for leak on hoses etc done.

Any idea what needs to be check? update the ECU system etc?

thanks in advance
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      07-31-2022, 08:41 AM   #2
Bst
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I had similar issue with low boost, but it was happening from time to time. Sometimes when you push the pedal hard the car would lose all boost and would barely move. Did all the things you did and found nothing. Then it turned out it is the rubber connection that goes from the charge pipe to the turbo it has some minor crack and was leaking boost from there. The car was 2007 123d, I know it's not F20, but hopefully this information can help you. I replaced the rubber hose and the car ran like new
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      07-31-2022, 06:50 PM   #3
Cedric1234
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The code came out after revving the vehicle to 2500-3000rpm and will lose all the power. Thanks will check on the hose. Hopefully it's not the rebuilt turbo issue.
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      08-01-2022, 09:50 AM   #4
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Just note that my issue happened on the road not stationary while I was trying to overtake. I think stationary you won't notice it at all since you need the car to be on boost moving to feel the difference.
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