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Discussion Starter #1
Hi,

2011 X5 E70 N55. just got P0127 intake air temperature too high OBDII code. Is it the Mass air flow sensor sitting right after the air filter reports this intake air temperature?

I took the sensor off, it looks very clean. the resistance between the 2 sensor wires are > 40K Ohm. That is very strange because I saw MAF sensor resistance for other cars are ~1,500 Ohm.

Does any one know the spec of X5 E70 N55 MAF sensor resistance?
The part if Continental SWK9 7512, made in Germany, PBT-GF30
BMW 1362 7593624-02

Thanks,
-Nick
 

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Nuclear engineer
02/2012 X5 35d M57Y CPO 99K miles NOKIAN WR G3 12K miles
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17,550 Posts
Yes, the MAF reports IAT. A multimeter is not adequate for troubleshooting integrated circuits. The MAF output signal is PWM that varies in duty cycle AND in Vmax.

A presumptive test for MAF failure is to unplug the MAF and run the engine. If it runs better without the MAF, on the default engine start map, then the MAF may be presumed faulty.
 

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Discussion Starter #3
Hi, Doug,

Thanks for your suggestion!

I unplugged the MAF, engine idle ran normal with 3 OBDII codes:

P0127 intake air temperature too high
P0113 intake air temperature sensor circuit high
P0100 Mass or Volume Air flow A circuit


If I plugged the MAF, engine idle ran a bit rough, but there is only P0127 code

Does this indicate the MAF is at least partially functional? Should it be replaced? I applied CRC Mass Air Filter sensor cleanser, didn't make any difference.

Thanks,
-Nick
 
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