How do I get my money back it did not work

I once submitted all the required paperwork for the money back and they never sent me a dime. I did see slight lowering of some numbers but very little. Basically buy it but don’t expect to actually get a refund much less twice the amount

Does this clean oxygen sensors and catalytic converter?

This product cleans out just about everything totally from the gas tank to the exhaust tailpipe. Severely clogged systems may require a second treatment but anyone that lets it get to that point is probably going to need a lot more than an oil change and a few spark plugs.

Does it have to be done right before the test or a week before is okay?

i've done it 4 days before testing...and this is if you're failing due to a worn out cat converter; if you're not passing due to HC, that is a tune up and maybe new O2 sensor...

Will this help with the egg smell I get once in a while after I floor it. Doesn't stink all the time only once in a while

Yes, it will. The "rotten egg" smell is unburned fuel passing through your car due to dirty injectors, dirty intake valves, dirty compression chambers, dirty catalytic converts and dirty EGR valve & passageways, and dirty spark plug tips. This product cleans all of these areas.

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Our Other Brands:Hewyn|Selfship

CRC 05063 12 Fluid Ounce Guaranteed to Pass Emissions Test Formula

CRC 05063 12 Fluid Ounce Guaranteed to Pass Emissions Test Formula

Product ID: 353920578

Details

Brand
CRC
Item Weight
0.01 Ounces
Number of Items
1
Special Feature
Unit Count
1.0 Count

⛽Boosts fuel economy by up to 5%

🌿Reduces emissions to pass strict tests

⚙️Maximum cleaning chemistry for peak engine performance

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₩124980

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In stock

Sold byAmazon South KoreaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚗 Clean Fuel, Clear Conscience: Pass Emissions Like a Pro!

ALL FUEL COMPATIBLE - Works seamlessly with gasoline and ethanol blends—no compromises.
EMISSION TEST CHAMPION - Guaranteed to help your vehicle pass emissions with cleaner exhaust.
ENGINE HEALTH GUARDIAN - Prevents buildup and mildew, extending engine life and reliability.
FUEL EFFICIENCY BOOSTER - Use every 3,000 miles to unlock smoother acceleration and better mileage.
POWERFUL FUEL SYSTEM DETOX - Super-clean your entire fuel system with maximum-strength detergent additives.

CRC 05063 is a high-performance fuel system cleaner designed to reduce emissions and improve fuel economy. Compatible with all gasoline and ethanol blends, it features maximum allowable cleaning chemistry to super-clean your fuel system, ensuring smoother acceleration and helping vehicles consistently pass emissions tests when used every 3,000 miles.

Specifications

ASIN	B000CIPUR8
Brand	CRC
Brand Name	CRC
Contains Liquid Contents	No
Contains Liquid Contents?	No
Country of Origin	USA
Customer Reviews	3.9 out of 5 stars 3,135 Reviews
Global Trade Identification Number	00078254050638
Item Weight	0.01 Ounces
Manufacturer	CRC Industries, Inc
UPC	078254050638

Reviews

N**7

Really Helps-Especially for Star Station Tests-Haven’t Failed Since Using in Two Older Vehicles

14.11.2016

F**I

Not really useful

23.11.2020

J**.

Just works!!!

24.02.2026

R**.

Phenomenal

19.03.2026

L**E

Worked like a charm.

17.02.2026

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

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Perfect platform for hard-to-find items. Delivery was prompt.

1 month ago

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₩124980

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In stock

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Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Korea.

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Smooth transaction and product arrived in perfect condition.

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