What are the best emissions test products?
Discover top cleaners and scanners that have helped real users like John pass emissions tests by boosting engine power and saving money on fixes.
Passing an emissions test can be stressful. Many drivers use cleaners and scanners to help their cars pass. One user said, “I added Cataclean and my check engine light went off—I passed easily!”
We reviewed top products like CRC and OBD2 tools. Our guide picks the best ones for you.
Real users love how these items boost engine power and save money. John shared, “The turbo tester found a leak fast—fixed it myself.” Keep reading to discover your perfect match.
List of Top 10 Emissions Test Products
| Image | Title | Best For | Price |
|---|---|---|---|
 |
CRC Guaranteed to Pass Emissions Test Formula, 12 Fluid Ounce |
CRC Guaranteed to Pass Emissions Test Formula is perfect for drivers of cars, SUVs, trucks, and hybrids that need to pass emissions tests without fail. Use this on gasoline engines to clean out sludge, boost power, and save fuel. |
|
 |
Cataclean Fuel & Exhaust System Cleaner – Pass Emissions Tests – Clear Check Engine Lights – Restores Catalytic Converters, DPF Filters and Cleans Fuel Systems, 16oz (120007) |
This product is perfect for car owners who are failing emissions tests, seeing check engine lights, or dealing with rough idles and hard starts. It helps restore catalytic converters, clear fuel systems, and boost performance for better gas mileage and smoother rides in gasoline, diesel, hybrid, and flex-fuel cars. |
|
 |
CRC Guaranteed to Pass Emissions Test Formula, 12 Fluid Ounce (Pack of 2) |
This product is perfect for car owners who want to pass their emissions test. It’s also great for anyone wanting to improve their car’s performance. |
|
 |
Cataclean Fuel & Exhaust System Cleaner – Pass Emissions Tests – Clear Check Engine Lights – Restores Catalytic Converters, DPF Filters and Cleans Fuel Systems, 8oz (120020CAT) |
Cataclean is perfect for drivers who want to pass emissions tests easily and keep their car’s exhaust system clean. It’s great for anyone facing a check engine light and for those seeking better fuel economy and a longer-lasting catalytic converter. |
|
 |
Catalytic Converter Cleaner Pass Emissions Test Cleans, Maintain Catalyst Efficiency Oxygen sensor and combustion chamber cleaner, Safe Fuel Additive |
This Catalytic Converter Cleaner is perfect for car owners who want to keep their cars running smoothly. It is also great for anyone wanting to save money on fuel and avoid costly repairs. |
|
 |
Cataclean Fuel & Exhaust System Cleaner – Pass Emissions Tests – Clear Check Engine Lights – Restores Catalytic Converters, DPF Filters and Cleans Fuel Systems, 16oz – Pack of 6 (120007-6) |
This product is perfect for car owners. It is also for anyone who wants to pass emissions tests. |
|
 |
AMTIFO OBD2 Scanner with Battery Tester – Check Engine Light & Emissions Readiness, Plug & Play, Battery Health, Real-Time Date, Car Code Reader, Support All OBD II Vehicles |
This OBD2 scanner is perfect for DIY mechanics who want to fix car problems at home without a shop. It’s also great for professional mechanics and busy car owners who need quick checks on engine lights, battery health, and real-time data to keep vehicles running smooth. |
|
 |
UMEIJA OBD2 Scanner with Upgrade Battery Tester – Diagnostic Tool for Cars That Check Engine Light & Emissions Readiness Read and Clears Vehicle Error Codes for All OBD II Protocol Vehicles Since 1996 |
This OBD2 scanner is perfect for DIY car owners who want to check and fix their own vehicles at home. It helps busy drivers spot engine issues fast and mechanics with quick tool work in the shop. |
|
 |
OBD2 Scanner with Upgrade Battery Tester – Diagnostic Tool for Cars That Check Engine Light & Emissions Readiness Read and Clears Vehicle Error Codes for All OBD II Protocol Vehicles Since 1996 Yellow |
This OBD2 scanner is perfect for car owners who like to fix problems at home. It’s also great for mechanics who need a fast tool to check vehicle health. |
|
 |
Orion Motor Tech Turbo System Leakage Tester Kit, 10pc Turbo Boost Leak Tester Set with 4 Pairs of Stepped Adapters 1-3/8″ to 3-1/2″, Turbo Pressure Leakage Tester for Cooling Emissions Exhaust Pipes |
This turbo system leakage tester kit is perfect for shop owners, professional mechanics, and DIYers who want quick, clear leak checks. It helps find leaks in turbo, cooling, and emissions systems with a simple setup. |
Detailed Reviews
Our guide picks the top 10 products for emissions tests using expert tips and real user reviews. We check each one closely to show its key features, how well it works, and great value. You can find the right fit for your needs, like easy use or low cost. Dive in to learn how these tools can help your car pass tests and save money.
1. CRC Guaranteed to Pass Emissions Test Formula, 12 Fluid Ounce
Get ready to pass your emissions test! CRC Guaranteed to Pass helps your car. It boosts power, performance, and fuel economy.
This formula uses a strong cleaner. It gets rid of sludge in your fuel system.
It works in all gasoline engines. It comes in a 12 fl oz bottle. CRC Industries makes it.
| Pros | Cons |
|---|---|
|
|
Perfect For:
CRC Guaranteed to Pass Emissions Test Formula is perfect for drivers of cars, SUVs, trucks, and hybrids that need to pass emissions tests without fail. Use this on gasoline engines to clean out sludge, boost power, and save fuel.
Ready to Purchase?
2. Cataclean Fuel & Exhaust System Cleaner – Pass Emissions Tests – Clear Check Engine Lights – Restores Catalytic Converters, DPF Filters and Cleans Fuel Systems, 16oz (120007)
Cataclean Fuel & Exhaust System Cleaner cleans your exhaust system. It helps pass emissions tests. It clears the check engine light.
Using Cataclean can lower total hydrocarbon emissions by up to 50 percent. It reduces carbon build-up in catalytic converters, DPF filters and sensors, boosting efficiency. Safe for gasoline, diesel, hybrid and flex-fuel vehicles; does not alter fuel.
Not for 2-stroke or oil/gas mix engines. It comes in a 16 oz bottle.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This product is perfect for car owners who are failing emissions tests, seeing check engine lights, or dealing with rough idles and hard starts. It helps restore catalytic converters, clear fuel systems, and boost performance for better gas mileage and smoother rides in gasoline, diesel, hybrid, and flex-fuel cars.
Ready to Purchase?
3. CRC Guaranteed to Pass Emissions Test Formula, 12 Fluid Ounce (Pack of 2)
Get ready to ace your emissions test! CRC Guaranteed to Pass helps your car run cleaner. It boosts performance and fuel economy too.
This formula is very advanced. It removes sludge and deposits from your fuel system.
It’s safe for all gasoline engines. Use it in your car, truck, or SUV. You’ll get a 12 fl oz bottle in each pack.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This product is perfect for car owners who want to pass their emissions test. It’s also great for anyone wanting to improve their car’s performance.
Ready to Purchase?
4. Cataclean Fuel & Exhaust System Cleaner – Pass Emissions Tests – Clear Check Engine Lights – Restores Catalytic Converters, DPF Filters and Cleans Fuel Systems, 8oz (120020CAT)
Cataclean cleans your car’s fuel and exhaust systems. It helps your vehicle pass emissions tests easily. Plus, it improves fuel economy and engine power.
It clears common check engine lights like P0420 and P0430. Cataclean keeps your catalytic converter running smoothly for longer.
You add it right to your fuel tank—no tools needed. It works in gasoline, diesel, and hybrid engines safely.
| Pros | Cons |
|---|---|
|
|
Perfect For:
Cataclean is perfect for drivers who want to pass emissions tests easily and keep their car’s exhaust system clean. It’s great for anyone facing a check engine light and for those seeking better fuel economy and a longer-lasting catalytic converter.
Ready to Purchase?
5. Catalytic Converter Cleaner Pass Emissions Test Cleans, Maintain Catalyst Efficiency Oxygen sensor and combustion chamber cleaner, Safe Fuel Additive
Revitalize your engine with our Catalytic Converter Cleaner. This advanced formula removes harmful deposits to keep things running smooth.
Simply add it to your fuel tank when you refuel. It works great with all gasoline and hybrid vehicles, and it’s safe for oxygen sensors.
You will see better fuel efficiency. You will get back your lost power. Try it today.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This Catalytic Converter Cleaner is perfect for car owners who want to keep their cars running smoothly. It is also great for anyone wanting to save money on fuel and avoid costly repairs.
Ready to Purchase?
6. Cataclean Fuel & Exhaust System Cleaner – Pass Emissions Tests – Clear Check Engine Lights – Restores Catalytic Converters, DPF Filters and Cleans Fuel Systems, 16oz – Pack of 6 (120007-6)
Cataclean is a powerful cleaner that tackles carbon build-up in your vehicle’s fuel and exhaust systems. It helps pass emissions tests by reducing hydrocarbon emissions by up to 50% in gas engines. Cataclean also restores catalytic converters, DPF filters, and oxygen sensors for top performance.
Use Cataclean to improve fuel economy and boost engine power with cleaner injectors and cylinder heads. It clears common check engine light codes like P0420 and P0430, saving you money on repairs.
Add Cataclean to your fuel tank easily without tools. It works for gasoline, diesel, and hybrid engines. It is safe and legal in all 50 states.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This product is perfect for car owners. It is also for anyone who wants to pass emissions tests.
Ready to Purchase?
7. AMTIFO OBD2 Scanner with Battery Tester – Check Engine Light & Emissions Readiness, Plug & Play, Battery Health, Real-Time Date, Car Code Reader, Support All OBD II Vehicles
Unlock your car’s secrets with the AMTIFO OBD2 Scanner! This tool helps you easily check your engine and battery health. Get ready for simple diagnostics at your fingertips.
This powerful scanner reads and clears codes fast. It also shows your car’s data in real-time. See RPM, speed, and more!
It’s easy to use and works on many cars. Keep your ride running smooth!
| Pros | Cons |
|---|---|
|
|
Perfect For:
This OBD2 scanner is perfect for DIY mechanics who want to fix car problems at home without a shop. It’s also great for professional mechanics and busy car owners who need quick checks on engine lights, battery health, and real-time data to keep vehicles running smooth.
Ready to Purchase?
8. UMEIJA OBD2 Scanner with Upgrade Battery Tester – Diagnostic Tool for Cars That Check Engine Light & Emissions Readiness Read and Clears Vehicle Error Codes for All OBD II Protocol Vehicles Since 1996
Tired of that pesky “check engine” light? The UMEIJA OBD2 Scanner is your answer! It quickly reads and clears error codes. It also checks your car’s emissions readiness with ease.
This tool works on most cars from 1996 and newer. It even tests your battery’s health.
Get yours today! It’s accurate, fast, and worth it. It could be the perfect gift for any car lover!
| Pros | Cons |
|---|---|
|
|
Perfect For:
This OBD2 scanner is perfect for DIY car owners who want to check and fix their own vehicles at home. It helps busy drivers spot engine issues fast and mechanics with quick tool work in the shop.
Ready to Purchase?
9. OBD2 Scanner with Upgrade Battery Tester – Diagnostic Tool for Cars That Check Engine Light & Emissions Readiness Read and Clears Vehicle Error Codes for All OBD II Protocol Vehicles Since 1996 Yellow
Meet the OBD2 Scanner, a handy tool that checks your car’s engine light and fixes error codes. It works with cars from 1996 and newer using all OBD II standards.
This scanner reads codes fast to show you what’s wrong with your car. It clears faults so you can fix issues yourself. Get real-time data on your vehicle’s health.
Check your battery too with the built-in tester that measures power. Use it to test sensors and systems for better fuel use. Buy this reliable gadget to keep your car running smooth.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This OBD2 scanner is perfect for car owners who like to fix problems at home. It’s also great for mechanics who need a fast tool to check vehicle health.
Ready to Purchase?
10. Orion Motor Tech Turbo System Leakage Tester Kit, 10pc Turbo Boost Leak Tester Set with 4 Pairs of Stepped Adapters 1-3/8″ to 3-1/2″, Turbo Pressure Leakage Tester for Cooling Emissions Exhaust Pipes
Fix turbo leaks fast with the Orion Motor Tech Turbo System Leakage Tester Kit. It checks leaks in turbochargers, cooling systems, and emissions parts on cars and trucks. Get accurate results every time you test.
This kit includes 4 pairs of stepped adapters with sizes from 1-3/8 inches to 3-1/2 inches. It also has test adapters, blanking adapters, a pressure gauge, a DIN adapter, and gloves for full coverage.
Use it simply by attaching adapters and connecting to air. Pressurize and listen for leaks to spot problems quick. Store it easy in the tough case made for travel.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This turbo system leakage tester kit is perfect for shop owners, professional mechanics, and DIYers who want quick, clear leak checks. It helps find leaks in turbo, cooling, and emissions systems with a simple setup.
Ready to Purchase?
Buying Guide
Passing an emissions test can be tricky. Luckily, there are products to help your car. These can boost engine power and save you money.
John fixed a leak using a turbo tester. Real users love how these items work.
Here’s what to think about when buying:
-
Type of Product: There are two main types. You can choose fuel additives or scanners. Additives help clean your engine. Scanners help you find problems.
-
Engine Compatibility: Make sure it works for your car. Some products work with gasoline engines only. Others work with diesel or hybrid engines.
-
Features: Consider what the product does. Does it clear the check engine light? Does it improve fuel economy? Think about what you need.
-
Size and Quantity: Additives come in different sizes. Some are sold as a single bottle. Others come in a pack of two or six. Choose the right amount for your needs.
-
User Reviews: See what other people say. Do they like the product? Does it work as promised? Read reviews before you buy.