whats the deal with people saying it worked and then the engine light came back on?

We have not heard of this being a common thing with using our Cat Complete product. From our experience the light stays off for a very long period of time, especially if you use one every 5,000 miles to keep the system clean. If 6 months or longer have gone by and the light comes back on it may be the same issue reoccurring. If we can provide any further assistance, please don’t hesitate to email or contact us at 800-345-6572. We can be reached M-F, from 8 am to 5 pm Eastern time.

Will it clear a P0411 code?

With the proper use of this product the vehicle CEL light will turn off if the vehicle has a code listed below, and/or that it will pass that state emissions test and has no other mechanical issue that is triggering the light: * OBD-II PID CODES P0138 P0139 P0143 P0144 P0145 P0146 P0151 P0152 P0153 P0154 P0157 P0158 P0159 P0160 P0163 P0164 P0165 P0166 P0171 P0173 P0174 P0175 P0420 P0421 P0430 P0431

After using it, do I hve to turn off the light myself? I have a toyota camry 2006

When the check engine light (CEL) or malfunction indicator light (MIL) illuminates, it has detected an engine system malfunction. Many auto parts stores offer free on board diagnostic (OBD) code checks, and inexpensive readers are available to purchase for do it yourself (DIY) checks. One of the most common codes is P0420 (along with related codes) for the emissions system that usually traces back to catalytic converter efficiency. If the converter is dirty or bad, likely something else caused this. CAT COMPLETE Fuel, Exhaust & Emissions System Cleaner not only helps with what may be causing the light to come on, but also the system that initiated the problem. Driving with CEL on can cause increased vehicle emissions, poor fuel mileage, reduced power, further engine damage beyond what the original problem is, and could eventually lead to vehicle breakdown. Sometimes the damage is so severe that cleaning will not help. For example, a converter that has operated with temperatures over 1300°F will start to melt inside and become permanently damaged. Or an oxygen sensor that is not dirty, but internally damaged. Your best chance of cleaning one of these systems is within the first few months of when the light comes on. However this formula can also work on a vehicle that has had the light on for years. Once the issue has been resolved, the light may continue to be on for a period of time. For some vehicles, it takes a few start/stop cycles for it to clear, others you may need to disconnect the battery for 15 minutes and leave the door open, then reconnect. See vehicle owners manual for resetting the CEL if applicable. If you have any other technical questions, feel free to contact our Technical Service Professionals at 800-345-6572 or if you would prefer you can use the contact us page on our website.

Can I use this twice in a row, like to tanks of gas back to back, or is it bad?

Yes you can. It is usually suggested you do so if your check engine light regarding your emission system remains on. Using this product twice in a row will not damage anything in your engine or emission system. If your emission system is clean & no check engine light is on, it is recommended that you use this product once every 5,000 miles to maintain a clean system.

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⛽ Clean fuel, clear conscience, and a ride that turns heads.

SAVE AT THE PUMP - Improves mileage and reduces fuel consumption, helping you cut down on costly gas expenses.
POWER UP YOUR DRIVE - Restores engine performance by removing carbon build-up and soot for a smoother, more powerful ride.
KEEP YOUR WARRANTY INTACT - Safe for oxygen sensors and catalytic converters—won't void your vehicle’s new car warranty.
BREATHE CLEANER DRIVE CLEANER - Reduces harmful emissions and passes smog tests, so you stay eco-friendly and compliant.
CHECK ENGINE LIGHT PROBLEM SOLVED - Clears OBD codes like P0420 and prevents annoying check engine light alerts.

Rislone 4720 Cat Complete Fuel, Exhaust & Emissions System Cleaner is a powerful 16.9 oz formula designed to clean fuel injectors, catalytic converters, oxygen sensors, and exhaust systems. Compatible with gasoline, ethanol, and hybrid vehicles, it boosts engine power, improves fuel economy, reduces emissions, and prevents costly repairs—all while maintaining your vehicle’s warranty and passing EPA standards.

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Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

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Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

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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.

AR$155419

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TrustScore 4.5 | 7,300+ reviews

Sneha T.

Received my product in pristine condition. Great service overall.

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Best international shipping I've ever tried. Worth every penny!

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Manufacturer	Bar's Products
Brand	Rislone
Model	Cat Complete Fuel, Exhaust & Emissions System Cleaner, Check Engine Light Medic
Product Dimensions	23.5 x 6.73 x 6.73 cm; 490 g
Item model number	4720
Manufacturer Part Number	4720
Special Features	50 state legal—EPA registered, Clear OBD P0420 & other OBD codes and turn check engine light off., Deodorizes sulphur “sulfur” (rotten eggs) exhaust smell., Pass emissions smog test, guaranteed.
Item Weight	490 g

Rislone4720 Cat Complete Fuel, Exhaust and Emissions System Cleaner,16.9 oz. | Cleans Catalytic Converter, Reduces Emissions & Saves Gas

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