Finally got my new to me 04 SR5 4.7 with 63k miles back after 2 weeks at the fly by night dealer I bought it from installed a new Magnaflow manifold and upstream Denso O2 sensor. After driving it for 200 miles or so, P0420 reared its ugly head. Should I waste my time with the non-fouler hack or jump straight to the URD O2 simulator?
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