Mass Air Flow Sensors

More commonly known as MAF sensor or air meter, the mass airflow sensor has one very important job; measuring the amount of air entering the engine for an optimal air-fuel ratio. Without this information, the ECU will not be able to accurately control fuel injection, resulting in an engine that will either idle roughly or worst case, not at all. But don’t worry! We’ve been producing OE MAF sensors since the 1970s. Today, we hold more than 30 patents in MAF sensing technology and signal processing, and have delivered more than 50 million OE MAF sensors for over 500 customer applications. So why not try us for your aftermarket needs too.

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Innovative OE design

We build our OE expertise into every MAF sensor we make. Featuring a proprietary temperature compensation design, they offer outstanding performance over a wide range of ambient temperatures. And are fast to respond to changing engine conditions – typically less than 15 milliseconds to respond to 90 percent of a flow change. Innovative, dual-heated elements on specific references also help to ensure optimal performance, fuel efficiency, and reduced emissions

OE engineered and tested

By testing and calibrating to OE specifications, our MAF sensors provide the same accurate readings and airflow output as the OE. Each sensor is tested on state-of-the-art sonic nozzle-testing equipment capturing over 6,000 data points per flow, for optimal calibration accuracy. They’re also flow tested to match the OE for signal stability (noise), temperature compensation (the ability of the MAF sensor to measure airflow accurately from -30°C to 70°C) and electromagnetic compatibility.

Never remanufactured MAF sensor

Some things are better new. That’s why every sensor we make – whether with or without the housing—is built with all-new components and never remanufactured. Remanufactured MAFs are simply cleaned and tested, so any contamination on the sensor may not be eliminated, resulting in inaccurate readings to the ECU.

Greener probe-only technology

It’s often the electronics on the sensor probe that fail, meaning it’s not always necessary to replace the complete part. So we developed a probe-only solution, in addition to a full range of complete units. By eliminating the plastic housing, this provides a greener, more cost-effective and faster repair option.

The complete package

With Delphi you get access to the complete package: the range, advanced DS diagnostics including the ability to look at live data, both at idle and max RPM, to determine if the MAF sensor is reporting the correct data, expert training and support and vehicle technical information including wiring diagrams, component locations and guided diagnostic procedures.

The Delphi Difference

100 years of OE experience, supplier to the world’s top automakers
OE heritage and knowledge built into every aftermarket part
Comprehensive portfolio for a wide range of vehicles and model years
Streamlined SKUs for easy inventory management
Support through tools, tips and training

Related product resources and downloads

NOx sensor replacement | Masters of Motion

1 min read

How to replace a NOx sensor

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Sensors Vehicle Electronics & Engine Management Need to Know Technicians 1 min read

Resource Highlights

The NOx sensor is a crucial part of the emission reduction system. This guide explains how to replace a NOx sensor if it becomes faulty or damaged.

The NOx sensor explained

An Oxides of Nitrogen sensor, or NOx sensor, is placed within diesel engines to monitor the output of oxides of nitrogen. It helps to keep these harmful emissions within regulated limits by triggering the selective catalytic reduction (SCR) system to reduce the amount of nitrogen oxides being emitted from the exhaust.

As an electronic component, a failing sensor can trigger the onboard computer to trigger Limp Home mode or prevent the engine from starting. Manufacturers often prevent their models’ engines from starting if it cannot fulfil emission requirements.

What to do if a NOx sensor fails?

If a vehicle is affected by the failure of a NOx sensor, there are likely to be some indicative symptoms such as:

Check engine light on
Engine non-start
Increased tail pipe emissions.

These symptoms can occur because the sensor is now giving an inaccurate reading (or none at all) about the nitrogen oxide makeup in the exhaust. This can lead to the SCR system overcompensating the amount of adblue, potentially causing ammonia slip to occur.

Read our guide to what causes NOx sensors to fail.

If these problems occur as the result of a faulty NOx sensor, it’s very important to repair or replace it as soon as possible.

Is it easy to replace a NOx sensor?

A NOx sensor replacement is a complex task. The sensor itself is a delicate component and replacing one is a job that should only be attempted by a professional.

How to replace a NOx sensor: step by step

Pick up some tips on replacing a faulty NOx sensor with this step-by-step guide.

How long does it take to replace a NOx sensor?

A NOx sensor replacement is an important enough task that can’t be hurried - the job must be done correctly and with the resolution of any lingering error codes on the OBD system.

Choose Delphi for quality parts and expert support as your trusted aftermarket partner.