Keep the ECU metering fuel accurately with the Standard Ignition Mass Air Flow Sensor MAS0291. This mass air flow sensor measures the mass of air entering the engine so the computer can deliver the correct air/fuel ratio. It installs as a direct-fit replacement for the listed applications: the 1997 and 1999 Mercedes-Benz C230 [L4-2.3L] and the 1998-1999 Mercedes-Benz SLK230 [L4-2.3L].
- 100% computer-tested: each unit is verified so the ECU receives accurate airflow readings, which are used to balance and deliver the correct air/fuel ratio to the engine.
- 100% new, never remanufactured: built from new components, so there is no leftover debris that can lead to sensor failure.
- Dual-heated sensing elements: designed for consistent performance, with sensing elements built to withstand changes in supply voltage.
- Complete assembly: ships with its plastic housing, an oval female connector, snap-fit attachment, two bolt holes, and five male blade terminals.
Manufactured to strict quality standards. If a faulty mass air flow sensor is the cause of symptoms such as rough idle, hesitation, poor fuel economy, or stalling, replacing it with this unit addresses that component. Diagnose the underlying cause before replacing, as these signs can have other sources.
Country of origin: Germany. Manufacturer part number MAS0291.
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What does this mass air flow sensor do?
It measures the mass of air entering the engine and reports it to the ECU, so the computer can meter fuel for the correct air/fuel ratio.
Which vehicles does the MAS0291 fit?
It is a direct-fit replacement for the 1997 and 1999 Mercedes-Benz C230 [L4-2.3L] and the 1998-1999 Mercedes-Benz SLK230 [L4-2.3L]. See the Buyer's Guide tab to confirm your vehicle.
Is this a complete assembly?
Yes. It includes the plastic housing, an oval female connector, snap-fit attachment, two bolt holes, and five male blade terminals.
Is it new or remanufactured?
It is 100% new and never remanufactured, so there is no leftover debris that could contribute to sensor failure. Each unit is also 100% computer-tested.
What are signs a mass air flow sensor may need replacing?
Rough idle, hesitation, poor fuel economy, or stalling can be signs. These symptoms have other possible causes, so diagnose the cause before replacing.
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