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this sounds like there may be a wiring loom issue ?
as if the injector loom is shorted out somewhere then this can create this fault
so I'd trace the injector wiring loom back into the main loom and check for hard sections and insulation damage / chafing and for corroded connections
clean and repair as required
I'd check the condition of the injector plugs / connections as this could be a lean misfire if an injector isn't firing properly - the best way to check this is with a 'noid' light
also check the state of the engine earth connections, all must be bright and clean and tight
there should also be a small earth connection that runs out of the wiring loom and secured to the engine with a small bolt and a ring terminal
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