Keep your engine's fuel calculation dialed in with the Standard Ignition Mass Air Flow Sensor (MAS0158). It fits as a direct-fit replacement for the listed applications: the 2002-2004 Audi A6, the 2001-2003 Audi Allroad Quattro, the 2002 Audi S4, and the 2003-2005 Volkswagen Passat.
A mass air flow sensor measures the amount of air entering the intake and reports it to the engine control module, which uses that reading to calculate the matching amount of fuel to deliver. When the original sensor drifts or fails, the ECM loses an accurate airflow signal, which can show up as rough idle, hesitation, stalling, reduced fuel economy, or an illuminated check engine light. If a faulty MAF sensor is the cause of those symptoms, this unit replaces it.
- Measures intake airflow: supplies the airflow signal the ECM relies on to meter fuel.
- Direct-fit replacement: designed to install in place of the original sensor on the listed applications.
- Airflow signal: helps return proper airflow readings for normal engine operation when the original has failed.
Manufacturer part number MAS0158.
Frequently Asked Questions
What vehicles does the MAS0158 fit?
It's a direct-fit replacement for the 2002-2004 Audi A6, 2001-2003 Audi Allroad Quattro, 2002 Audi S4, and 2003-2005 Volkswagen Passat. Check the Buyer's Guide tab to confirm your vehicle.
What does a mass air flow sensor do?
It measures the amount of air entering the intake and sends that signal to the engine control module, which uses it to calculate the correct amount of fuel to deliver.
What are signs my MAF sensor may need replacing?
Rough idle, hesitation or stalling, poor fuel economy, and a check engine light can be signs. These symptoms can have other causes, so diagnose before replacing.
Will this resolve my rough idle?
If a failed mass air flow sensor is the cause, replacing it addresses that. Because a rough idle can stem from other issues, confirm the sensor is at fault first.
What is the manufacturer part number?
This is Standard Ignition mass air flow sensor, manufacturer part number MAS0158.
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