Best Emission Control Units of 2026

Robert Reyes Avatar
Robert Reyes
Last Updated: Jan 10, 2026

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Emission Control Units are devices designed to reduce the amount of harmful pollutants released into the environment by internal combustion engines. These units are installed in various types of vehicles, including cars, trucks, and buses. They work by converting the harmful gases produced by the engine into less harmful substances before releasing them into the atmosphere. Emission Control Units are crucial in reducing air pollution and improving the quality of air we breathe. They are an essential component of modern vehicles, and their use is mandated by law in many countries.

At a Glance: Our Top Picks

GM Genuine Parts 84631875 Reductant Control Module Cover #TOP 1
GM Genuine Parts 84631875 Reductant Control Module
ftb score rating icon 9.9
GM Emission Reduction Fluid Controller Cover #TOP 2
GM Emission Reduction Fluid Controller
ftb score rating icon 9.8
Graco-Sharpe 6950 880A Air Control Unit Cover #TOP 3
Graco-Sharpe 6950 880A Air Control Unit
ftb score rating icon 9.6

Top 10 Emission Control Units

#TOP 1

GM Genuine Parts 84631875 Reductant Control Module

84631875
GM Genuine Parts 84631875 Reductant Control Module Cover
GM Genuine Parts 84631875 Reductant Control Module

The GM Reductant Control Module is built to meet high standards, ensuring it fits perfectly with your Chevrolet, Buick, GMC, or Cadillac vehicle. Since it may have been previously sold under ACDelco GM Original Equipment, you can trust its quality and compatibility. This part is carefully designed and tested by GM engineers specifically for your vehicle, which means it helps your emission system work efficiently. Plus, GM continuously improves their parts by using new materials and technologies, so you get a reliable and up-to-date component that helps your vehicle run cleaner and smoother.

What We Like
High-quality engineering
Vehicle-specific design
Tested for reliability
Updated materials and technology
#TOP 2

GM Emission Reduction Fluid Controller

39153712
GM Emission Reduction Fluid Controller Cover
GM Genuine Parts 39153712 Emission Reduction Fluid Controller

The GM Emission Controller is engineered to meet high standards of quality and performance. It is designed specifically for your Chevrolet, Buick, GMC, or Cadillac, ensuring a perfect fit and optimal function. With regular updates to its design, this part incorporates the latest materials and technologies, which enhances reliability and efficiency. Additionally, GM backs this product, giving you peace of mind knowing it has been rigorously tested by experts. This means you can trust it to effectively manage your vehicle’s emissions, contributing to a cleaner environment while maintaining your vehicle’s performance.

What We Like
High-quality engineering
Designed for specific vehicles
Regular design updates
Backed by General Motors
#TOP 3

Graco-Sharpe 6950 880A Air Control Unit

6950
Factory
75 CFM
Graco-Sharpe 6950 880A Air Control Unit Cover
GracoSharpe 6950 880A Air Control Unit

The Graco-Sharpe 6950 880A Air Control Unit, made in China, is an emission control unit with a 1/2 inches NPT(f) inlet, 3/8in NPT(f) and 1/4in NPT(f) outlet, 200 psi maximum, and 75 CFM filter capacity.

What We Like
Durable and efficient construction
Filters air at high capacity to provide clean air for emission control
Multiple outlet sizes for versatility in usage
#TOP 4

Alliant Power Reman FICM for 6.0L Power Stroke

AP65124
Alliant Power Reman FICM for 6.0L Power Stroke Cover
Reman Pre-programmed FICM for 2004-2010 6.0L Power Stroke Engine | NO CORE DUE | Alliant Power # AP65124N | OEM #'s 4C3Z12B599ABRM, 4C3Z12B599AB, 4C3Z12B599ERM

The Alliant Power Reman FICM is designed for 2004-2010 6.0L Power Stroke engines and offers several benefits to make your experience easier. You get a 24-month unlimited mileage warranty, so you can drive with confidence knowing your investment is protected. The product comes with expert technical support, providing you with reliable help whenever you need it. Alliant Power offers a wide range of over 200 parts for various engines, making it a trusted brand with plenty of options. Plus, this FICM is built to OEM standards, ensuring quality and compatibility for your vehicle. Enjoy peace of mind with this dependable, USA-made part.

What We Like
24-month unlimited warranty
Expert technical support
Wide range of parts
OEM quality and testing
#TOP 5

Dorman 598-218 EGR Line for Audi/Volkswagen

598-218
Dorman 598-218 EGR Line for Audi/Volkswagen Cover
Dorman 598-218 Exhaust Gas Recirculation (EGR) Line Compatible with Select Audi/Volkswagen Models

The Dorman EGR Line is designed as a direct replacement to fit and work just like your vehicle’s original exhaust gas recirculation line. This means you can expect a smooth installation without worrying about compatibility issues. It helps restore the proper air-fuel mixture by addressing problems caused by buildup in the EGR valve, which can improve your engine’s performance. Built with durable materials and crafted under strict quality standards, this line ensures reliable and long-lasting use. Plus, it’s backed by a team with over 100 years of automotive experience, giving you peace of mind about the product’s quality and support.

What We Like
Direct replacement fit
Restores air-fuel balance
Durable construction
Trusted quality assurance
#TOP 6

GM Genuine Parts 85514348 Reductant Control Module

85514348
GM Genuine Parts 85514348 Reductant Control Module Cover
GM Genuine Parts 85514348 Reductant Control Module

The GM Reductant Control Module is crafted to meet strict quality standards, ensuring reliable performance for your vehicle. Designed by GM engineers, it fits Chevrolet, Buick, GMC, or Cadillac models perfectly, giving you confidence in its compatibility and function. This part has evolved from previous ACDelco GM Original Equipment, showing a history of trusted design. GM also updates these parts regularly, using the latest materials and technology, so you benefit from continuous improvements and enhanced durability. Choosing this module means you get a product backed by General Motors, giving you peace of mind for your emission control system.

What We Like
High-quality engineering
Vehicle-specific design
Trusted brand backing
Regular technology updates
#TOP 7

BMW Geniune PREHEATING Control Unit

BMW
12-21-8-591-724
Multi
BMW Geniune PREHEATING Control Unit Cover
BMW Geniune PREHEATING Control Unit:122040

The BMW PREHEATING Control Unit is a genuine OEM product that provides quality engine effectiveness and is designed specifically for BMW vehicles. With its direct fit design, it ensures easy installation and compatibility with your vehicle. This control unit is essential for preheating your engine, allowing for quicker and more efficient starts, especially in colder temperatures. By preheating the engine, it helps to reduce wear and tear on the engine components, prolonging their lifespan and ensuring optimal performance. The BMW PREHEATING Control Unit is a reliable and efficient solution for maintaining the performance of your BMW vehicle.

What We Like
Genuine OEM
Quality engine effectiveness
Easy installation
#TOP 8

Generic TRP 12-00663-64 Cover Door Bezel for Carrier APX

Generic
120066354 / 120066364
black
Generic TRP 12-00663-64 Cover Door Bezel for Carrier APX Cover
Generic TRP 12-00663-64 Cover Door Bezel for Carrier APX Controller ONLY Bezel

The Generic Carrier APX Bezel is designed specifically for the Carrier APX controller, making it a perfect replacement part for your emission control unit. This bezel helps protect the controller's door, ensuring it stays secure and functional. As a product from the Generic brand, it offers a straightforward solution for maintaining your equipment without unnecessary extras. Its focus on compatibility means you can trust it to fit well and keep your system running smoothly. If you need a reliable cover bezel, this product provides the convenience of easy installation and peace of mind for your Carrier APX controller.

What We Like
Controller door protection
Compatible with Carrier APX
Easy replacement part
Reliable and straightforward
#TOP 9

BYPARTSJC AC Control Panel for Caterpillar 320D Excavator

293-1136
BYPARTSJC AC Control Panel for Caterpillar 320D Excavator Cover
AC Controller Panel for Caterpillar E312D E320D E329D E330D E336D Excavator, Air Conditioner Assemble Con trol 293-1136 145670-7950

The BYPARTSJC AC Panel is designed specifically for Caterpillar 320D excavators, ensuring a perfect fit for your machinery. Made from durable PC material, this control panel resists wear and aging, offering you long-lasting performance. Its modular design and quick terminal wiring make installation straightforward and hassle-free, saving you time and effort. The panel features a clear display and simple buttons, making it easy to operate so you can quickly adjust your excavator’s air conditioning without confusion. This compact and user-friendly control panel is a reliable part to keep your equipment running smoothly.

What We Like
Durable PC material
Easy installation
Clear display
Simple operation
Compact design
#TOP 10

MyParts Electronic Load Detector for Honda and Acura

PA-5113667
MyParts Electronic Load Detector for Honda and Acura Cover
Electronic Load Detector ELD Compatible with Honda CR-V Civic Acura

The MyParts Load Detector is designed to be a cost-effective replacement for your vehicle's original equipment. You get a product made using the latest software and modern manufacturing tools, ensuring you receive a reliable and up-to-date part. This direct replacement fits perfectly, so you won’t have to worry about compatibility issues. Installing the MyParts Load Detector is just as straightforward as putting in the factory unit, saving you time and effort. This means you can easily maintain your Honda or Acura’s emission control system without hassle or extra costs.

What We Like
Affordable OE-quality
Modern manufacturing
Direct fit replacement
Easy installation
Buying Guide Image

Frequently Asked Questions (FAQs)

1. What does it mean when the emission control system light comes on?

When the emission control system light comes on in a car, it indicates a fault in the system. This could be due to the engine burning too much fuel, not burning enough fuel, or a broken sensor. It's important to address the issue to reduce carbon footprint and ensure proper functioning of the system.

2. How much does it cost to fix emission control system?

The cost of fixing an emission control system depends on the specific cause of the issue. Repairs typically start around $200, while replacing the exhaust system can start at approximately $175. It's recommended to consult a professional to determine the exact cost and necessary repairs.

3. Is it safe to drive with emission control light on?

Driving with the emission control light on is generally safe if the car is operating smoothly. However, it is important to identify the reason for the light to come on by having it checked by a professional. Ignoring the issue may lead to further complications and potential damage to the vehicle.

4. What causes emission system problems in a car?

Emission system problems in a car can be caused by various factors, including clogs, leaks, failing mass airflow or oxygen sensors, and issues with the exhaust system. These problems can affect engine performance, cause overheating, and impact the overall functioning of the vehicle.

5. What are the three general types of emission controls?

Emission controls can be categorized into three main types: engine design techniques, fuel and lubricant related technologies, and exhaust gas aftertreatment. Each of these categories includes various approaches to reduce emissions and improve environmental impact.

6. How long can you drive with a check emission light?

If the check engine light is on due to sensor issues, it is generally safe to drive for 50 to 100 miles. This may allow time for the sensors to reset and turn off the light. However, it is recommended to scan the computer for error codes if the light persists to identify and address the underlying problem.

Editor's Notes

During our emission control unit research, we found 24 emission control unit products and shortlisted 10 quality products. We collected and analyzed 4,017 customer reviews through our big data system to write the emission control units list. We found that most customers choose emission control units with an average price of $184.17.

The emission control units are available for purchase. We have researched hundreds of brands and picked the top brands of emission control units, including GM GENUINE PARTS, SHARPE, Alliant Power, Dorman, BMW. The seller of top 1 product has received honest feedback from 384 consumers with an average rating of 4.7.

Written by
Robert Reyes Avatar

Robert Reyes is a dedicated writer from San Francisco with a bachelor of degree in mechanics and a bachelor of degree in marketing. He focuses on making some complicated topics simple and enjoys explaining complex and technical things in an easy-to-understand way.