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Diagnostic trouble code C0091 indicates: 4Tracción Total (WD/AWD) Potencia Transferencia Unidad Posición Sensor A. It was set by your vehicle's onboard diagnostics system and will typically keep the check engine light on until it's addressed.
Upload your ECU file and DTC Doctor will detect this code (and any others) automatically, then remove it for good — no dealer visit, no guesswork.
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