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.

Manufacturer	Bar's Products
Brand	Rislone
Model	Cat Complete Fuel, Exhaust & Emissions System Cleaner, Check Engine Light Medic
Item Weight	1.08 pounds
Product Dimensions	9.25 x 2.65 x 2.65 inches
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.

Rislone 4720 Cat Complete Fuel, Exhaust and Emissions System Cleaner,16.9 oz. | Cleans Catalytic Converter, Reduces Emissions & Saves Gas

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