What causes a P0104 code?

P0104 can be triggered by several issues — see the verified probable causes and step-by-step diagnostics shared by mechanics and owners on OBDIY.

Can I drive with a P0104 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0104 active.

Follow the step-by-step diagnostic on this page, then read the verified fixes contributed by other Heavy Truck owners — the answer marked "Verified Cause" worked for the original poster.

OBDIY

OBD-II

P0104

P0104 Mass Air Flow Sensor Circuit Intermittent

What it means

The engine control module detects a fluctuating or inconsistent signal voltage from the Mass Air Flow sensor that does not correspond with engine load or throttle position.