Audi A4 B5 (1994–2001)Faults of the mass airflow sensor
Mass airflow sensor of the Audi A4 B5: problems and faults
In the Audi A4 B5 there are 2 documented faults of the mass airflow sensor: dirty or faulty air flow meter on the 1.9 TDI (loss of power) (1.9 TDI engine) and air mass meter (MAF sensor) failure (1.8 T 20v engine).
- Low severity: Dirty or faulty air flow meter on the 1.9 TDI (loss of power) · 1.9 TDI engine
- Low severity: Air mass meter (MAF sensor) failure · 1.8 T 20v engine
Most serious fault: Low severity
Faults by engine
From most to least important. Check the affected years and versions on each page.
Symptoms these faults cause
How much the repair costs
Parts for the Audi A4 B5 for faults of the mass airflow sensor
The same search across several shops so you can compare prices. The part number varies with the engine and year: confirm it with the registration plate or VIN.
Air flow meter (mass air flow sensor)
Air mass meter (MAF sensor)
Affiliate links: if you buy from these shops, MotorFiable may receive a commission at no cost to you. Check compatibility against the registration plate or VIN before ordering. Affiliate links
Frequently asked questions
What faults of the mass airflow sensor does the Audi A4 B5 have?
In the Audi A4 B5 there are 2 documented faults of the mass airflow sensor: dirty or faulty air flow meter on the 1.9 TDI (loss of power) (1.9 TDI engine) and air mass meter (MAF sensor) failure (1.8 T 20v engine). Each fault has its own page with the affected years and versions, the symptoms and how to check for it.
Mass airflow sensor of the Audi A4 B5: how much does the repair cost?
Depending on the fault, at an independent garage it ranges from €100 (dirty or faulty air flow meter on the 1.9 TDI (loss of power)) to €300 (dirty or faulty air flow meter on the 1.9 TDI (loss of power)), including VAT.
Which engines of the Audi A4 B5 have faults of the mass airflow sensor?
The documented faults affect the 1.9 TDI and 1.8 T 20v engines. Check the years and versions on each page: they do not always affect every unit.
Have you had a fault of the mass airflow sensor on your Audi A4 B5? Tell us at what mileage and how much you paid. Report your fault.
Sources
Every fact on this page links to its source. If you find an error, let us know.
- Caudalímetro o sensor MAF: qué es, cómo funciona y cuáles son las averías más frecuentesDiariomotor · Motoring press · consulted 30 October 2026 · in Spanish
- Fiabilité et pannes Audi A3Fiches-auto.fr · Other source · consulted 27 September 2026 · in French