--- product_id: 287923766 title: "Rislone 4720 Cat Complete Fuel, Exhaust and Emissions System Cleaner,16.9 oz. | Cleans Catalytic Converter, Reduces Emissions & Saves Gas" brand: "rislone" price: "€ 54.15" currency: EUR in_stock: true reviews_count: 13 category: "Rislone" url: https://www.desertcart.gr/products/287923766-rislone-4720-cat-complete-fuel-exhaust-and-emissions-system-cleaner store_origin: GR region: Greece --- # Boosts fuel efficiency + mileage Clears CEL & OBD codes, EPA compliant Cleans fuel, exhaust & emissions systems Rislone 4720 Cat Complete Fuel, Exhaust and Emissions System Cleaner,16.9 oz. | Cleans Catalytic Converter, Reduces Emissions & Saves Gas **Brand:** rislone **Price:** € 54.15 **Availability:** ✅ In Stock ## Summary > 🚗 Clean systems, clear codes, and unstoppable drives! ## Quick Answers - **What is this?** Rislone 4720 Cat Complete Fuel, Exhaust and Emissions System Cleaner,16.9 oz. | Cleans Catalytic Converter, Reduces Emissions & Saves Gas by rislone - **How much does it cost?** € 54.15 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/287923766-rislone-4720-cat-complete-fuel-exhaust-and-emissions-system-cleaner) ## Best For - rislone enthusiasts ## Why This Product - Trusted rislone brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Save at the Pump:** Improves fuel economy across gasoline, ethanol & hybrid vehicles—drive farther, spend less. - • **Smog Test Savior:** Effectively clears P0420 & other OBD codes to help you pass emissions inspections hassle-free. - • **Power Up Your Drive:** Restores engine power by removing carbon & soot buildup for peak performance. - • **All-Engine Compatible:** Works on fuel injected, direct injected, turbo, GTDI, Ecotec & EcoBoost engines—universal cleaning power. - • **Keep Your Warranty Intact:** Safe for oxygen sensors & catalytic converters; won’t void your manufacturer’s warranty. ## Overview CAT Complete Fuel, Exhaust & Emissions System Cleaner is a powerful EPA-registered formula designed to deep-clean fuel injectors, catalytic converters, oxygen sensors, and exhaust systems. Compatible with all major engine types and fuel blends, it boosts power, mileage, and fuel economy while preventing costly repairs and clearing check engine light codes like P0420. Regular use ensures your vehicle runs cleaner, greener, and smoother—perfect for professionals who demand peak performance and reliability. ## Description Fuel, Exhaust & Emissions, Systems Cleaner: CAT COMPLETE Fuel, Exhaust & Emissions System Cleaner has high-performing detergents and heavy duty cleaning solvents that effectively scrub and remove contaminants, soot, carbon build-up, and oily residue from the fuel injectors, combustion chambers, turbo, EGR, catalytic converters, oxygen sensors and the exhaust system. These along with other active chemical agents, react with the gases created in the combustion process to remove the remaining inorganic deposits. This process restores their function and with regular use maintains efficiency. As fuel is burned contaminating byproducts are created that get circulated throughout various vehicle components. The system is designed to be able to handle this process during most normal engine operation. However, the use of poor quality fuel, short driving distance, cold weather, improper maintenance, and component failure can greatly increase the amount of contamination and deposits created inside these systems. Such factors can cause increased exhaust emissions, reduced fuel economy, lost power & performance, drivability issues, engine overheating, hard starts, check engine light illumination and premature engine wear. Review: P0420 CEL Clear - Kept resetting P0420 CEL on my 2007 Toyota Corolla, hoping I could quickly go through drive cycle and pass my smog check before it came back on. Same code kept coming back on within 2-3 miles of a reset so using Rislone was my last hope before I tried the non fouler trick. Below is exactly what I did, hope it helps someone! 1) Filled my gas tank with premium gas, drove it down to half tank over a few days of driving before I inserted Rislone. 2) Drove ~30 miles and then refueled to full tank with premium gas again(Half highway/half city as instructions state) 3) Instructions say after completing step 2, drive the car to 1/4 gas tank at which point CEL should clear. For me, I drove ~25-30 miles over 3 days, clearing the CEL each time it came back on. During the 3rd day (~60 miles since using Rislone), the CEL didn’t come back on and all monitors reset! Immediately went to smog station and passed. CEL is still off, not sure it will last but who cares! Car is running fine and I don’t need to pay for a new converter just to pass a smog test! Tips: 1) Not sure if premium gas made a difference but I read several people say they used non ethanol/premium gas which cleared P0420 so figured it couldn’t hurt. 2) I bought a cheap OB2 monitor which I kept on when driving so I could see exactly when CEL was coming back on and when monitors are smog ready. If you’re lucky, resetting CEL and going thru drive cycle may be enough to get past smog without using Rislone. In my case, the P0420 CEL would come on within 2-3 miles each time I reset the CEL so using Rislone was a must. 3) Each car is different but generally speaking, once you reset CEL the drive cycle consists of warming up the car for a few minutes and driving 50-60 mph a few times, ideally letting the car come to a stop with no or minimal use of the brake. Make sure A/C is off. Using the OB2 monitor while driving the car will help you get a feel for your cars drive cycle. 4) If a CEL code is pending, the relative monitor to your code will not clear! In California, all monitors except EVAP have to be ready to pass smog, your state may be different. Review: Product failed miserably - EDITED - Not much else to say, there. I followed the directions to the letter (driving more highway AND city than what's instructed) and P0420 remains on the OBD. I've been told now by two very experienced mechanics that these products rarely work - after now trying both Cataclean and this one, I now understand why they say this. EDIT EDIT EDIT!!! Just changed to 5-star because, although it took driving the car beyond what the instructions say, it has worked perfectly. P0420 is now gone, vehicle passed state inspection "with flying colors" and registration is complete. Key take-away: Give this more time to work if it doesn't do the job right away. I did nothing different - same gas as always (I fill up with Chevron or Texaco almost every time as they include Techron in their gas and my former racecar driver brother-in-law says that's the best). I do also add a bottle of Techron on occasion to give an extra "boost" to the cleaning power. ## Features - Increase power, performance, mileage and save gas: Cleans by not only the entire emissions and exhaust system, but the fuel system as well. Works with gasoline, ethanol and hybrid vehicles. - Save on expensive fuel system and emission control repairs: Regular use every 5,000 miles tunes-up the fuel, emissions and exhaust systems keeping them clean and preventing the CEL light from returning. - Will not void manufacturer’s new vehicle warranty: Specifically designed and safe to use on vehicles which have oxygen sensors and catalytic converters. Exceeds EPA compliance performance criteria. - Works on all fuel injected, direct injected, carbureted, turbo, GTDI, Ecotec and EcoBoost engines. - Clean fuel and exhaust systems reduce excess exhaust hydrocarbon, CO and NOX emissions and saves gas. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B08SPVQJ6J | | Best Sellers Rank | #6,864 in Automotive ( See Top 100 in Automotive ) #22 in Fuel System Cleaners | | Brand | Rislone | | Customer Reviews | 4.1 4.1 out of 5 stars (1,226) | | Date First Available | January 11, 2021 | | Item Weight | 1.08 pounds | | Item model number | 4720 | | Manufacturer | Bar's Products | | Manufacturer Part Number | 4720 | | Model | Cat Complete Fuel, Exhaust & Emissions System Cleaner, Check Engine Light Medic | | Product Dimensions | 9.25 x 2.65 x 2.65 inches | | 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. | ## Images ![Rislone 4720 Cat Complete Fuel, Exhaust and Emissions System Cleaner,16.9 oz. | Cleans Catalytic Converter, Reduces Emissions & Saves Gas - Image 1](https://m.media-amazon.com/images/I/714GamXHUcL.jpg) ## Available Options This product comes in different **Style** options. ## Questions & Answers **Q: whats the deal with people saying it worked and then the engine light came back on?** A: 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. **Q: Will it clear a P0411 code?** A: 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 **Q: After using it, do I hve to turn off the light myself? I have a toyota camry 2006** A: 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. **Q: Can I use this twice in a row, like to tanks of gas back to back, or is it bad?** A: 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. ## Customer Reviews ### ⭐⭐⭐⭐⭐ P0420 CEL Clear *by M***V on October 29, 2023* Kept resetting P0420 CEL on my 2007 Toyota Corolla, hoping I could quickly go through drive cycle and pass my smog check before it came back on. Same code kept coming back on within 2-3 miles of a reset so using Rislone was my last hope before I tried the non fouler trick. Below is exactly what I did, hope it helps someone! 1) Filled my gas tank with premium gas, drove it down to half tank over a few days of driving before I inserted Rislone. 2) Drove ~30 miles and then refueled to full tank with premium gas again(Half highway/half city as instructions state) 3) Instructions say after completing step 2, drive the car to 1/4 gas tank at which point CEL should clear. For me, I drove ~25-30 miles over 3 days, clearing the CEL each time it came back on. During the 3rd day (~60 miles since using Rislone), the CEL didn’t come back on and all monitors reset! Immediately went to smog station and passed. CEL is still off, not sure it will last but who cares! Car is running fine and I don’t need to pay for a new converter just to pass a smog test! Tips: 1) Not sure if premium gas made a difference but I read several people say they used non ethanol/premium gas which cleared P0420 so figured it couldn’t hurt. 2) I bought a cheap OB2 monitor which I kept on when driving so I could see exactly when CEL was coming back on and when monitors are smog ready. If you’re lucky, resetting CEL and going thru drive cycle may be enough to get past smog without using Rislone. In my case, the P0420 CEL would come on within 2-3 miles each time I reset the CEL so using Rislone was a must. 3) Each car is different but generally speaking, once you reset CEL the drive cycle consists of warming up the car for a few minutes and driving 50-60 mph a few times, ideally letting the car come to a stop with no or minimal use of the brake. Make sure A/C is off. Using the OB2 monitor while driving the car will help you get a feel for your cars drive cycle. 4) If a CEL code is pending, the relative monitor to your code will not clear! In California, all monitors except EVAP have to be ready to pass smog, your state may be different. ### ⭐⭐⭐⭐⭐ Product failed miserably - EDITED *by A***. on February 6, 2024* Not much else to say, there. I followed the directions to the letter (driving more highway AND city than what's instructed) and P0420 remains on the OBD. I've been told now by two very experienced mechanics that these products rarely work - after now trying both Cataclean and this one, I now understand why they say this. EDIT EDIT EDIT!!! Just changed to 5-star because, although it took driving the car beyond what the instructions say, it has worked perfectly. P0420 is now gone, vehicle passed state inspection "with flying colors" and registration is complete. Key take-away: Give this more time to work if it doesn't do the job right away. I did nothing different - same gas as always (I fill up with Chevron or Texaco almost every time as they include Techron in their gas and my former racecar driver brother-in-law says that's the best). I do also add a bottle of Techron on occasion to give an extra "boost" to the cleaning power. ### ⭐⭐⭐⭐⭐ Works great *by A***A on April 3, 2026* Works great ## Frequently Bought Together - Rislone 4720 Cat Complete Fuel, Exhaust and Emissions System Cleaner,16.9 oz. | Cleans Catalytic Converter, Reduces Emissions & Saves Gas - Rislone 4700 Hy-per Fuel Complete Fuel System Cleaner, 16.9 oz. - Dura Lube Severe Catalytic and Exhaust Treatment Cleaner Fuel Additive, 16 fl. oz., (PN: HL-402409 PDQ3) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.gr/products/287923766-rislone-4720-cat-complete-fuel-exhaust-and-emissions-system-cleaner](https://www.desertcart.gr/products/287923766-rislone-4720-cat-complete-fuel-exhaust-and-emissions-system-cleaner) --- *Product available on Desertcart Greece* *Store origin: GR* *Last updated: 2026-06-02*