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Your P0202 and P0204 codes tell you there is an abnormality in the injector circuit. The injectors are nominally 14 ohms, if the driver circuit is faulty, you'll be replacing the PCM.
Being adjacent cylinders, you could have the injector ground circuits shorted together within the loom for cylinders 2 and 4.
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Gary
Gold Certified Holden Technician
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