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Available at your local auto parts. Web i'm thinking of adding a spark plug non fouler to the 2nd o2 sensor to hide the 0420 code. Available at your local auto parts. The simple fix can be an alternative to more extensive measures for a certain period of time. Web discussion starter · #1 · sep 14, 2014. Take it slowly because it is safer and more accurate. Tapered applications for this product select a vehicle to see vehicle applications. Make it about 12 inches. This spark plug non fouler is designed for easy installation on specified vehicles to protect spark. Web the answer to your question depends on the downpipe/midpipe you're going to be using and the bung size and thread pitch on it. Web o2 oxygen sensor fitting plugs or weld bungs (10 pack steel bungs, m18 x 1.5) (10 pack steel bungs, m18 x 1.5) 4.7 (163) $1999 free delivery wed, mar 8 on $25 of items.