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DTC/P0104·Audi

P0104 on Audi: Causes, Symptoms and Fix Cost

Quick Answer
Moderate SeveritySafe to drive (short-term)Audi

P0104 on a Audi means the signal from the mass air flow (MAF) sensor circuit is cutting in and out or jumping erratically instead of changing smoothly with engine speed and load. The engine computer sees the airflow reading behave in a way real airflow cannot. The cause is usually a loose or corroded connection, a wire breaking inside its insulation or a failing sensor, and because the fault comes and goes it often takes a wiggle test or a road test with live data to find. VW, Audi, Skoda and SEAT apps often show this code as P010400; the last two digits are a failure-type byte.

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What does P0104 mean on a Audi?

The Quick Answer above is the generic definition. What follows is the model-specific detail for the Audi models that log P0104.

Audi A4

1997-2024

Audi uses the same Volkswagen Group fault list, so VCDS reports P0104 as 16488 against the G70 air mass meter and the same checklist applies: wiring and connections first, then leaks in the intake before or after the meter, then the meter itself. On older VW Group diesels that feel down on power, a useful check is logging the measured air mass in the engine computer's measuring blocks with manufacturer-level software such as VCDS during a third-gear, full-throttle pull from about 1,700 to 4,000 rpm.

What causes P0104 on a Audi?

Beyond the generic causes listed on the main P0104 page, these are the patterns noted for Audi models:

Audi A4Poor contact or short circuit in the G70 connector and wiring
Audi A4Intake leak before or after the G70 air mass meter

How to diagnose P0104 on a Audi with OBD2

Follow these steps to pinpoint the root cause of P0104:

  1. Read every stored code and the freeze frame. The engine speed, load and road speed recorded when P0104 set tell you whether it happens at idle, under load or over bumps
  2. Inspect the MAF connector and harness: check the locking tab, look for green corrosion or water in the plug, and feel along the wires near the connector for a kink or a soft spot where a strand may have broken
  3. With the engine idling, watch the live MAF value (the standard OBD2 airflow reading in grams per second) while you wiggle the connector and harness. A reading that spikes to zero or to maximum as you move it confirms a wiring fault. Generic OBD2 readers update only a few times a second, so a very short drop-out may not show; repeat the test several times
  4. Inspect the intake ducting on both sides of the sensor for splits, loose clamps and a badly seated air filter housing
  5. Road test while logging MAF and engine speed. The airflow value should rise and fall smoothly with engine speed and load; sudden steps or drops that do not match what your foot is doing point to the circuit or the sensor
  6. Check the supply and ground at the connector while the engine runs, ideally under load, because a poor connection can pass a static test and still fail when current flows
  7. If the wiring, connections and intake are sound, replace the MAF sensor
  8. Clear the code and drive over several days, including rough roads and a warm engine, because an intermittent fault can take time to show whether it is really fixed

How much does P0104 cost to fix on a Audi? (EUR)

Estimated repair costs for P0104 in EUR, compiled across makes. Expect Audi parts and labour towards the upper end of each range.

Repair Parts Cost Labor Cost Total Estimate DIY Difficulty
Clean, reseat and secure the MAF sensor connector €0–€10 €0–€40 €0–€50 Easy
Repair MAF sensor wiring (power feed, ground or signal) or connector pins €10–€60 €60–€180 €70–€240 Moderate
Replace MAF sensor (aftermarket) €40–€150 €30–€80 €70–€230 Easy
Replace MAF sensor (OEM) €80–€300 €30–€80 €110–€380 Easy
Replace split intake boot or loose clamp €20–€80 €30–€100 €50–€180 Moderate
Extended diagnosis to trace an intermittent fault (road test with live data) €0–€0 €60–€130 €60–€130 Professional

Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.

These codes are often seen alongside P0104 or point to related issues, on any make:

P0100P0101P0102AudiP0103AudiP0113P0171AudiP0174Audi

Looking for the full P0104 reference (all makes, full diagnosis flow, complete repair cost matrix)?

See the main P0104 guide
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