BiG PiMpIn!
Member
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- 2006 MaZdA 6
Hey guys I have a 2006 M6 I have had the infamous Po421 code in there for awhile and its coming back due for inspection and I have been reading up on the Non-Fouler trick to do with the o2's I did the non fouler with the o2 right behind the first warm up cat the one thats on the manifold and with some luck the Po421 went away but then I got a whole mess of lean codes..My question is do I have to do this to both the middle 02 and the very rear o2 to correct this issue?? Iam out of the Emission warranty or I would just take it to Mazda...