Just a quick 5 months update, so I have been using 2 spark plug defoulers on my 2nd O2 sensor since I gutted my cat in May. The CEL has came on once after 2 weeks, I cleared it with bimmerlink, it's now 5 months later and CEL has never came back. I am living proof the spark plug defouler O2 sensor trick still works for literally everyone saying it won't work on our cars.
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Mods: Dinan Tuned, Intake, Catless DP
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