P0104 Fault Code

Mass or Volume Air flow Circuit Intermittent

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0104 code indicates an intermittent issue in the mass or volume air flow circuit. This means that the vehicle's Engine Control Module (ECM) is experiencing inconsistent readings from the mass air flow (MAF) sensor, which can impact engine performance and fuel efficiency. It's crucial to address this problem as it can lead to increased emissions and reduced throttle response.

What are the symptoms of the P0104 code?

Symptoms associated with a P0104 code may include:

• Rough idle or stalling of the engine.
• Decreased acceleration or sluggish performance.
• Increased fuel consumption due to incorrect air/fuel mixture.
• Check Engine Light illuminated on the dashboard.
• Potentially failed emissions tests.

What causes the P0104 code?

Common causes of a P0104 code include:

• A faulty mass air flow sensor that may be failing intermittently.
• Wiring issues such as damaged or corroded connectors that lead to poor electrical connections.
• Vacuum leaks in the intake manifold that affect air flow measurement.
• Contamination of the MAF sensor caused by oil, dirt, or debris
• Poor calibration of the MAF sensor potentially due to previous service work or replacement.

How to fix P0104?

To resolve a P0104 code, recommended steps include:

• Inspecting the MAF sensor for dirt, contamination, or physical damage; cleaning or replacing it as necessary.
• Checking all wiring and connectors for signs of wear, corrosion, or damage, and repairing them as needed.
• Inspecting the air intake system for leaks or obstructions that could affect airflow.
• Clearing the fault codes and performing a test drive to see if the issue reoccurs. If the problem persists, further diagnostic testing may be required.