P1128 — Mazda — HO2S Bank 1 Sensor 1 Signals Swapped In Key On Engine Running Self Test

P1128 (Mazda): HO2S Bank 1 Sensor 1 Signals Swapped In Key On Engine Running Sel… — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

HO2S Bank 1 Sensor 1 Signals Swapped In Key On Engine Running Self Test. Source catalogue definition; confirm applicability using vehicle service information.

Affected system: Powertrain