Mass air flow sensor: Diagnostics
WARNING: This page is about a different car, the 2001 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.
Three different diagnostic trouble codes can be generated if the mass air flow sensor develops a fault:
- If the mass air flow sensor does not send a frequency at all to the control module, diagnostic trouble code P0100 will be generated. This can be due to a break in one of the leads.
- If the frequency is too low, diagnostic trouble code P0102 will be generated. This can be due to a major leak between the mass air flow sensor and the throttle body or and internal fault in the mass air flow sensor.
- If the frequency is too high, diagnostic trouble code P0103 will be generated. This can be due to and internal fault in the mass air flow sensor.