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

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How to check a NOx sensor

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Sensors Vehicle Electronics & Engine Management How to Technicians 1 min read

Resource Highlights

A vehicle’s NOx sensor is one of the most complex pieces of kit you’ll come across. They’re tricky to test and difficult to diagnose. But in a few simple steps you’ll be able to pinpoint potential issues with a quick NOx sensor check.

Find out if a vehicle’s NOx sensor is the cause of engine issues with some pointers from the Delphi experts. Watch our video to discover:

What to look for on the wiring diagram
Which tests to perform for a quick diagnosis
How to operate the diagnostic tools you’ll need

How often do NOx sensors go bad?

NOx sensors don’t have an expected lifespan, as each individual vehicle and set of driving conditions can have different effects on the performance of the sensor. However, a NOx sensor is a relatively delicate piece of kit, which means it may need attention at some point.

Can you repair a NOx sensor?

NOx sensors cannot be repaired as they are a complex component, with multiple measurement chambers. For NOx sensors you must diagnose, test, and replace.

Can a NOx sensor be cleaned?

We would not recommend cleaning the NOx sensor due to its sensitivity. Replacing a NOx sensor would be the preferred course of action if dirt is clogging up the sensor.

Can I drive with a bad/faulty NOx sensor?

No. A faulty NOx sensor may prevent the engine from maintaining its emission standards at an acceptable level, or in more extreme circumstances prevent the engine from starting at all. With a bad NOx sensor the vehicle is likely to go into Limp Mode, which should indicate there’s an issue with the engine to be addressed as soon as possible.

Is a NOx sensor the same as a lambda sensor?

No, the two components are not the same. A NOx sensor is used to measure the levels of oxides of nitrogen being emitted, while the lambda sensor is used to measure the amount of oxygen present in the exhaust gas.