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OBD Code P0104

Mass or Volume Air Flow Circuit Intermittent

CodeP0104
DescriptionMass or Volume Air Flow Circuit Intermittent
Possible CausesLoose connector; Damaged wiring; Intermittent MAF failure
SymptomsIntermittent stalling; Rough idle occasionally
SystemAir Metering

What Does P0104 Mean?

Mass or Volume Air Flow Circuit Intermittent. This diagnostic trouble code (DTC) is stored when the vehicle's onboard computer detects an issue with the air metering.

Code Breakdown

P = Powertrain code

0 = Generic (SAE standard)

How to Fix P0104

Follow these diagnostic steps to identify and resolve the issue. Always start with the simplest checks before moving to more involved repairs.

  1. Clean or replace the mass airflow (MAF) sensor — use MAF-specific cleaner only.
  2. Inspect the air filter for clogs or improper installation.
  3. Check for air leaks between the MAF sensor and throttle body.
  4. Verify the MAF sensor readings match expected values at idle and snap throttle.
  5. Inspect the intake air temperature sensor.
  6. Clear codes and monitor MAF readings during a test drive.

Note: These are general diagnostic guidelines. Some vehicles may have model-specific procedures. Always consult your vehicle's service manual for exact specifications and torque values. If you are not comfortable performing these steps, visit a qualified mechanic.

Frequently Asked Questions

Is P0104 serious?

P0104 is generally considered a low-severity code. While it should still be addressed, it is unlikely to cause immediate safety concerns. However, ignoring it long-term may lead to higher emissions or reduced fuel economy.

Can I clear P0104 myself?

You can clear any OBD-II code with a code scanner or by disconnecting the battery for 15-30 minutes. However, clearing the code without fixing the underlying problem will cause it to return, usually within one or two drive cycles. If the code triggered the check engine light, the light will come back on. Fix the root cause first, then clear the code.

How much does it cost to fix P0104?

Repair costs vary widely depending on the root cause. Some fixes are free (like tightening a gas cap) while others can cost several hundred dollars (like replacing a catalytic converter or oxygen sensor). A proper diagnosis with a professional scan tool, not just reading the code, is the first step to getting an accurate repair estimate. Many auto parts stores offer free code reading, but a thorough diagnosis usually requires a mechanic.

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