OBD scan tool read code is P0100

1996 BMW 318I

127,000 MILES

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1 POST

check engine light on and I used OBD scan tool read code is P0100
my car allway checking when start engine or when I stop for the red light engine shut off but when I drive on free way sometime nothing sometime checking how can I do
thank you so much

chan

Oct 18, 2012 at 8:15 AM

SQM

✓Experienced Mechanic
6,383 POSTS

Hello,

The code P0100 is a fault code for the Mass air flow sensor.
Specifically, the circuit for the Mass air flow sensor.
This could be due to not having correct voltage to the sensor. It can also be a malfunctioning sensor.

I have attached the electrical parameters for this code below.
If there is sufficient voltage to the sensor then it is likely a faulty sensor and will need replacement.

https://www.2carpros.com/articles/how-a-mass-air-flow-sensor-works-maf

Please let me know if you have any questions.
Thank you.

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