You have an exhaust leak in your welds where you relocated the bungs. I had this problem and the only way to find the leak was to pressurize the pipe by stuffing the ends with rags and using an air gun. Spray soapy water around your welds and the pinholes will show up. I kept getting this code and my leaks were microscopic!
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Toy: 2008 Silver Z4MC 300WHP/241TQ
Mods: OEM Euro Headers, RPI Scoop
Daily: 2010 Tacoma Double Cab
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