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ohkay, the first 3 is located in the maf sensor. check/replace with a known working one.
the injector circuit is the wire that plugs into your injectors. should be 4 for them to each injectors. check for loose/broken/cracked wires.
you can check your ecu too. replace with a known working one to see if the cel clears your first 3 cel.
goodluck.
later.
edit, i meant there are 4 plugs to each injector.
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