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Hi i've been getting this code every couple tanks of gas recently. I have an 08 s240 engine mods on the car are (Cup car airbox, larini clubsport 8 inch exhaust, zeitronix a/f ratio sensor and display, sikou michi catchcans, and gotham tune.) I attributed it to bad gas but I've tried different stations and it's been popping up like clock work. Anything I should check for?