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

1 min read

How to program TPMS valve on a Nissan Leaf

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

Resource Highlights

Need a refresher in how to program a TPMS valve? This video takes you through what you need to do, step by step.

You’ll need to program a TPMS valve if you’ve replaced the component due to a fault. Once it’s been installed correctly, the vehicle has to undergo a learning process. This is a fairly simple procedure, which you can complete with a Delphi BlueTech diagnostic tool.

In this video we’ll show you:

• The process of how to program and re-learn a TPMS valve, using a Nissan Leaf to demonstrate

• How to navigate the diagnostic tool

What is a TPMS valve?

TPMS stands for tyre pressure monitoring system. This measures tyre pressures from electric sensors that are inside the tyre valve and then sends that information to the vehicle’s computer. If it detects a change in air pressure, the system will alert the driver with a yellow/amber warning light on the dashboard.

Why does a TPMS valve need to be programmed?

Programming a new TPMS sensor is an essential step. Universal or “programmable” TPMS sensors need the correct information to function as they should. Out of the box the technician needs to programme them with the unique sensor data and what vehicle it is being fitted to. If this step is missed, the sensor won’t transmit any information to the computer.

What’s the difference between programming a TPMS sensor and ‘re-learning’?

When a TPMS valve is being replaced, the procedure isn’t completed until the vehicle has “re-learned” the component. This will ensure it works properly so that the whole TPMS system functions as it should.

This is different to programming a sensor, because in the re-learn step the vehicle’s computer is being told which sensors are in which tyre location so they’re correctly recognised.

Is it mandatory to have TPMS?

It became mandatory to have TPMS in the USA as long ago as 2007, in Europe on new cars from 2014 and since then trucks, trailers, buses and coaches have been added to that list. In July 2024 mini-buses, small trailers, pick-ups and vans have been added. To make sure the vehicle complies with regulations check the category for the vehicle being worked on.

How long does a battery last?

As TPMS became mandatory several years ago, and batteries last between 5-10 years expect to see many sensors now failing. Informing a customer that all sensors will need to be replaced and programmed may be the only option.

Why is a diagnostic tool needed?

We use the Delphi BlueTech diagnostic tool in the video. This is used to connect both with the sensor and the vehicle’s ECU and ensure the correct codes are communicated.