Fault code P0104 – a step-by-step guide to diagnosing and fixing it

The meaning of error code P0104 – Mass or Volume Air Flow Circuit Intermittent

P0104: Causes, signs and repairs

Error code P0104 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system has detected an intermittent or irregular fault in the mass air flow sensor (MAF) circuit. This DTC P0104 indicates a problem with the mass air flow sensor or its electrical connection, as a result of which the engine control unit is not receiving reliable air flow readings.

What can cause this error code?

Defective mass air flow sensor (MAF sensor)
Dirty or clogged mass air flow sensor
Damaged cable connections to the MAF sensor
Corroded or loose plug connections
Defective engine control unit (ECU)
Air leaks in the intake tract
Clogged air filter
Defective throttle valve
Problems with the power supply to the sensor

What symptoms occur in parallel with fault code P0104?

Irregular idling: Engine runs unevenly or stutters when idling
Loss of power: Significantly reduced engine power during acceleration
Increased fuel consumption: Noticeably higher consumption due to incorrect mixture formation
Starting problems: Difficult starting or longer starting times
Jerking when driving: Engine jerks, especially at low engine speeds
Exhaust problems: Black smoke from the exhaust possible

How can the problem with error code P0104 be rectified?

The repair requires a systematic diagnosis to identify the exact cause.
Clean the mass air flow sensor: Carefully clean MAF sensor with special cleaner and reinstall after drying
Change the air filter: Replace the clogged air filter with a new one and check the air supply to the sensor
Check cable connections: Check all electrical connections to the MAF sensor for damage and repair them
Clean plug connections: Clean corroded contacts on the sensor plug and treat with contact spray
Replace the mass air flow sensor: If the defect is irreparable, replace the entire MAF sensor with a new component
Seal the intake tract: Locate and rectify leaks between the air filter and throttle valve
Measure the power supply: Check the power supply to the sensor with a multimeter and repair if necessary

FAQ - Frequently asked questions about DTC P0104

Can I continue driving with error code P0104?

Short distances are possible, but fault code P0104 should be rectified promptly. The engine runs in the emergency running program with reduced performance and increased consumption.

How much does it cost to repair error code P0104?

The costs vary depending on the cause: cleaning the MAF sensor costs 50-80 euros, a new mass air flow sensor between 150-400 euros, and cable repairs around 100-200 euros in the workshop.

How can I diagnose error code P0104 myself?

First check the air filter and carefully clean the MAF sensor. Check all cable connections for visible damage and test the plug connections on the sensor.

Does error code P0104 return after the repair?

If the root cause has not been completely rectified, code P0104 may occur again. Make sure you change the air filter regularly and avoid soiling the MAF sensor.

What consequential damage can error code P0104 cause?

In the long term, incorrect mixture formation can damage the catalytic converter, the lambda sensors or other engine components. Fuel consumption also increases considerably.

Is fault code P0104 manufacturer-specific?

No, P0104 is a standardized OBD-II trouble code that has the same meaning for all manufacturers and indicates problems with the mass air flow sensor circuit.

Vehicles in which fault code P0104 occurs most frequently

Error code P0104 is a widespread mass air flow sensor error and can occur in practically all modern vehicles with an OBD system, but is most common in the following vehicles:

BMW: 3 Series, 5 Series, X3, X5 (2000-2015)
Mercedes-Benz: C-Class, E-Class, ML-Class, Sprinter (1998-2012)
Audi: A4, A6, Q5, TT (2001-2014)
Volkswagen: Golf, Passat, Touran, Tiguan (2000-2013)
Ford: Focus, Mondeo, Kuga, Transit (2002-2016)
Opel: Astra, Vectra, Insignia, Zafira (2001-2015)
Renault: Megane, Laguna, Scenic, Kangoo (2003-2014)
Peugeot: 307, 407, 3008, Partner (2002-2013)
Citroën: C4, C5, Picasso, Berlingo (2004-2015)
Nissan: Qashqai, X-Trail, Micra, Primera (2001-2014)

If the code P0104 occurs in your vehicle, you should first check the air filter and the mass air flow sensor, as these components are most frequently the cause of this error code. For more complex electrical problems or if the simple solutions do not help, we recommend that you visit a specialist workshop for a professional EOBD diagnosis.

How to change front wheel bearing on MERCEDES-BENZ M W163 TUTORIAL | AUTODOC

151K views

Published on: 26/07/2018
How to change fuel filter BMW 3 (E90) [TUTORIAL AUTODOC]

241K views

Published on: 17/04/2019
How to change Front wheel bearing on VW GOLF 4 TUTORIAL | AUTODOC

177K views

Published on: 26/07/2018
How to change a rear brake pads FORD FOCUS 3 TUTORIAL | AUTODOC

169K views

Published on: 27/07/2018
How to change pollen filter / cabin filter on AUDI A6 (C6) [TUTORIAL AUTODOC]

150K views

Published on: 25/10/2019
How to change engine thermostat on PEUGEOT 207 [TUTORIAL AUTODOC]

147K views

Published on: 09/12/2020
How to change fuel filter NISSAN X-TRAIL T30 TUTORIAL | AUTODOC

139K views

Published on: 27/07/2018
How to change front wheel bearing TOYOTA YARIS XP10 TUTORIAL | AUTODOC

120K views

Published on: 26/07/2018

How to change serpentine belt on MERCEDES-BENZ A-Class (W169) – replacement guide

Free download PDF
1.38 MB
How to change engine oil and filter on BMW 1 Hatchback (F20) – replacement guide

Free download PDF
1.62 MB
How to change engine thermostat on VW Golf VI Hatchback (5K1) – replacement guide

Free download PDF
4.12 MB
How to change water pump & timing belt kit on Ford Fiesta JA8 – replacement guide

Free download PDF
7.83 MB
How to change front strut mount on AUDI A1 Hatchback (8X1, 8XK) – replacement guide

Free download PDF
3.8 MB
How to change water pump & timing belt kit on Peugeot 307 SW – replacement guide

Free download PDF
7.01 MB

Want to get more useful information?

Ask questions or share your repair experience on the car forum. Subscribe to updates so you don't miss out on new guides.

Ask on the forum

TOP 5 mistakes during DIY oil change | AUTODOC tips

37K views

Published on: 17/06/2021
How do EGR valves work? | AUTODOC

23K views

Published on: 18/07/2020
#DIY guide: Changing your car's color with a spray can | AUTODOC tips

6K views

Published on: 25/03/2021
Stop Rust Before It Starts: Top 5 Tips for Car Body Protection | AUTODOC Insights

7K views

Published on: 27/07/2023