P0104 Code - Mass or Volume Air Flow Circuit Intermittent

What Does P0104 Mean?

P0104 is the code for issues with the Mass Airflow (MAF) Sensor having inconsistent, erratic or irregular high output voltage/signal to the Engine Control Unit (ECU).

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What are the common causes of P0104?

Common causes of this code are a disconnected plug at the MAF sensor, moisture or debris that has contaminated the vane of the MAF, a faulty MAF, a cracked or broken air inlet pipe, clogged air filter element, or faulty PCM. PCM failures are rare.

What are the symptoms of P0104?

The ECU will also illuminate the MIL (malfunction indicator lamp), also referred to as the CEL (check engine light), though you may not notice any drivability issues. Still, aside from the MIL, some common symptoms may include difficulty starting, poor idle quality, or lack of power. Additionally, since the MIL indicates that the ECU is now running the engine in open-loop “limp home mode,” you may also notice poor fuel economy.

How do you troubleshoot P0104?

Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Pull the connectors apart and carefully look at the terminals (the metal parts) inside the connectors. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code P0104 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before P0104.

Fortunately, P0104 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

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