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its the wiring... check to see if an afc or something was installed (check all the wiring from ecu to maf - there is a problem there)
code 12 can only be - maf, maf wiring or the wires pin at the ecu or maf.
be sure its getting 12v (blk and wht) gnd (blk) and that theres no short for the signal (wht)
if those are mixed up it usually fries the ecu.
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HREs on a S13 - check, 6262 - check, Girlfriend.... - nope
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