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.
| 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 | Clear OBD P0420 & other OBD codes and turn check engine light off., 50 state legal—EPA registered, Deodorizes sulphur “sulfur” (rotten eggs) exhaust smell., Pass emissions smog test, guaranteed. |
