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Because the OEM and the EPA doesn't want you screwing with the pulley, which is one of the reasons the newer cars have them jammed on.
Some cars come with wideband sensors which allow them to get better data.
Narrow bands are extremely good at detecting 14.6 (for gas cars) but they get less accurate as they get further away, widebands are better at decting a wider range, the EPA wants you at 14.6.
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