CUSTOMER CONCERN The check-engine light returns with DTC P219A for a bank-one air/fuel imbalance, but the vehicle has no obvious drivability complaint and prior plug and vacuum-leak checks found no fault. CAUSE Restricted EGR passages in the intake manifold created uneven exhaust-gas distribution between cylinders. CORRECTION Remove the intake manifold and EGR tube, clean the restricted EGR passages, and replace the intake-manifold gaskets as documented in the confirmed repai

CUSTOMER CONCERN The malfunction indicator is on with DTC P219A, no misfires are present, and long-term fuel trim remains in the single digits. CAUSE Flow testing found one fuel injector delivering substantially less fuel than the other three. Cleaning did not restore the injector's flow. CORRECTION Remove and replace the low-flow fuel injector, confirm the replacement injector matches the remaining injectors, and road test to verify DTC P219A does not return.