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Engine Sensors

Mass Airflow Sensor (MAF)

Measures the mass of air flowing into the engine intake, sending this data to the engine computer (ECU) so it can determine the precise amount of fuel to inject for optimal combustion.

$150 – $400

Total Cost

As needed (typically 100,000+ miles, or clean every 30,000 miles)

Replace Interval

Easy

DIY Difficulty

Schedule Soon

If It Fails

Overview

The Mass Airflow Sensor measures the volume and density of air entering the engine, allowing the computer to calculate the correct amount of fuel to inject. It's critical for proper engine performance and emissions.

Parts Cost

$80 – $300

Labor Cost

$30 – $100

Failure Symptoms

Check engine light (P0100-P0104 codes)

Moderate

Poor acceleration and hesitation

Moderate

Engine running rich (black exhaust smoke)

Moderate

Rough idle or stalling

Moderate

Poor fuel economy

Low

Hard starting

Moderate

Warning Signs to Watch

Check engine light with MAF-related codes
Engine feels sluggish or hesitant
Fuel economy drops suddenly
Engine runs rough when air filter is due for replacement

Common Causes of Failure

1Contamination from dirty air filter or oiled aftermarket filter
2Normal wear of the sensing element
3Oil vapors from PCV system contamination
4Wire damage from rodents or engine heat

Prevention Tips

Replace the air filter on schedule
If using a reusable (oiled) air filter, don't over-oil it
Clean the MAF sensor with MAF-specific cleaner every 30,000 miles
Address PCV valve issues that can contaminate the MAF

When to Replace

Try cleaning first — it's free and works 50% of the time. Replace if cleaning doesn't resolve symptoms and diagnostic codes confirm MAF failure.

Mass Airflow Sensor (MAF) by Make

Nissan MAF sensors are a common failure point, especially on Altima and Pathfinder. Genuine Hitachi sensors are recommended over cheap aftermarket.

BMW MAF sensors are sensitive to contamination from oiled air filters. Stick with paper filters unless you're comfortable cleaning the MAF regularly.

Ford trucks with the 5.4L V8 are known for MAF sensor issues. Cleaning with MAF cleaner often resolves the problem.

Related Parts

Engine Air Filter

Clean air filter protects the MAF sensor from contamination

MAF data helps determine fuel mixture that spark plugs ignite

Frequently Asked Questions

Need Mass Airflow Sensor (MAF) Replacement?

Get a free quote from a local mechanic. Average cost: $150 – $400.

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