A happy car driver decoded check engine light and car trouble codes with handheld OBD2 scanner

Save more with SMOG Checker

The essential OBD2 scanner that decodes check engine light and tells emissions test results

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Free shipping + 30-day free return


Quick scan, big savings

Instantly decode check engine light and save thousands with BLCKTEC 420 Handheld OBD2 scanner

From $xx9.99

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As Seen on

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5 star rated

“This Diagnostic Tool has been a lifesaver for me. Offers convenience, accuracy, and value that's hard to beat.”

- Verified Customer

Pass with confidence.
Know the SMOG test results beforehand

Do a 1-min scan at home with the BLCKTEC SMOG Checker to find out whether your car is ready to pass the emissions inspection

Green light showing no issues with the emissions system

to go

Yellow light showing potential issues


Red light showing that emissions system will not pass the state government mandated test


A person holding BLCKTEC smog checker, using it to read and clear car codes

Why every driver needs a BLCKTEC OBD2 scanner

Piggy bank next to a dollar sign to indicate saving money

Save thousands

Find out how much repairs should cost to avoid rip-offs.

Car icon with heart above to indicate safe driving

Easy to use

No complex jargons or rocket science involved. Just plug and scan.

Thumbs up icon to indicate ease of use

Prevent breakdowns

Spot and fix problems before they occur down the road.

Shield icon with check symbol to indicate peace of mind

Drive stress-free

Experience the peace of mind that comes with knowing your car’s health.

First time diagnosing your car? We’ve got you covered. Just plug and scan

a person using BLCKTEC 400 OBD2 code reader to plug and scan their vehicle
BLCKTEC 440 430 420 410 400 OBD2 car scanners

Don’t know which is the right scanner for you? 

Find your tool now

Don’t know which is the right scanner for you? Take our 2 mins quiz and find out

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Uncover what car owners
cannot stop raving about

Uncover what car owners cannot stop raving about

Easy to use, worth the money

“Worth the money and in comparison to other products, you're getting features that more expensive readers offer.


Verified customer

Does Everything It Says it Will

“Beats spending a couple hundred bucks and a few hours at a dealer to replace a cap they forgot to put back.”

Eric E. Carlson

Verified customer

WOW, impressed

“ I am impressed was not expecting a full functional Bluetooth App that keeps a log of every time you scan a vehicle. This is a big thing that comes in small package. Built for many years of service..”


Verified customer

Best purchase for my vehicle yet!

“Literally, turn it on, plug it into the car, have phone ready and turn on the ignition. The two pair and BAM! You have your code”


Verified customer

Compact size, perfect for the glove box

“It's amazing how something so small can be so powerful and useful when it comes to understanding your vehicle's health.”


Verified customer

Very easy to use

“It took me about 3 minutes to connect it to my car and get a detailed report. Recommending this to everyone that has a car ”

Cinthia Cavazos

Verified customer

check engine light

Check engine light on? Try BLCKTEC

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More reasons to choose BLCKTEC

Man's hand holding a smartphone, with the RS2 diagnostic app shown on screen

the right fix

Beyond reading and clearing trouble codes, our OBD2 scanners provide the largest verified fix database to help customers identify and fix car problems.

Man's hand holding BLCKTEC OBD2 auto code reader inside a car

One scanner,
unlimited scans

Our scanners support unlimited vehicle scans and reports, as well as free firmware updates, saving you costs on future purchases

Reading and clearing car codes on a smartphone with Repair Solutions 2 app

Premium App

Get valuable insights from our top-rated RS2 app, including confirmed fixes, predicted repairs, and more. No subscription needed.

Customer support specialists talking on phone

Unrivaled US
Customer Support

We have local Americans on the line, ready to answer your questions in English or Spanish. All you need to do is pick up the phone.

American company

Proudly made.
Proudly USA

Unlike most competitors, BLCKTEC is a 100% American company, dedicated to providing quality products by Americans, for Americans.

SMOG Checker
BLCKTEC 400 Entry Level Handheld OBD-II Scanner

400 - Entry Level
400 - Entry Level
400 - Entry Level
400 - Entry Level
400 - Entry Level
400 - Entry Level
400 - Entry Level
400 - Entry Level
400 - Entry Level
400 - Entry Level
400 - Entry Level
400 - Entry Level
400 - Entry Level
400 - Entry Level
Shop for BLCKTEC 420 OBD2 scanner on amazon.com now

Free shipping + 30-day free return

Features that empower you to go the extra mile


Get your scanner delivered in 3-5 days. Need it faster? Opt for expedited shipping at checkout.

Hassle-Free Return

Not 100% satisfied with our product? Not a problem. Let us know within 30-days of purchase for a full refund—no questions asked.

1-Year Warranty

Drive stress-free, knowing that your new scanner is protected by our free 1-year warranty.

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Smartphone screen displaying DTC codes found during a vehicle scan while using the RS2 app with freeze frame support

Get verified fixes from the highest-rated auto repair app in the US.

No subscription needed. EVER

Stay informed about recalls, TSB updates, predicted repairs, and more.


user downloads


check engine light

Trouble codes



Reviews worldwide



Verified fixes


5 star reviews

Five-star ratings


Get for iOS and Android

Apple App store
google play

*RepairSolutions2 App is ONLY available for download in USA and Canada Apple App Store and Google Play Store and it will NOT work in other countries.

Best entry level OBD2 scanner: the BLCKTEC 400 Smog Checker scanner

Save time and money by passing your emissions test the first time


Free shipping + 30-day free return

Shop now on Amazon

Get started with 3 quick & easy steps

Plug in the handheld OBD2 scan tool

Step 1: Plug it in

Plug the scanner into your car’s OBD2 port, which is typically located beneath the dashboard, near the driver’s seat.

Turn the ignition to “ON” position. DO NOT start the engine

Step 2: Turn the key

Turn the ignition to “ON” position. DO NOT start the engine

Monitor your car’s vitals on the OBD2 scanner and get ready to troubleshoot.

Step 3: Start scanning

Monitor your car’s vitals on the scanner and get ready to troubleshoot. Download the FREE RS2 app on your phone to access more features.

Call us! We have Americans on the line, ready to help

BLCKTEC leads the field because we are a 100% US company. We provide unrivaled customer support, by Americans, for Americans

Besides US-based call support, we also have:

Live chat

24/7 Email support

Talk to one of our experts

English & Spanish available

Customer support specialists talking on phone
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BLCKTEC scanner supports all OBD2-compliant cars which are vehicles sold and registered in the USA and Canada after 1996, including sedans, light trucks, SUVs, and hybrids vehicles.

RepairSolutions2 App is only available in the USA and Canada.

Mechanic holding clipboard talking to a car owner at a car repair shop

Stop Overpaying for Car Repairs

Be in the know and save on your next visit
to the mechanice

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Don't get fooled by mechanics,
find the true cost of repairs

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The BLCKTEC Difference

Our tools are designed for accuracy and ease, standing head and shoulders above the rest

Feature Other scanners
Subscription Fee Zero Subscription Fees Hidden Subscription Fees
Design  Users Friendly & Easy Set-up Clunky design, hard to use
Application Dedicated App with Regular Updates  Limited-feature app
Verified Fixes Provide Verified Fixes & Estimated Costs  No Guidance
Support US based ASE Certified Support  Limited or No support
Scans Unlimited Vehicle Scans  Limited Number of Scans