Is there two oxygen sensors in a opel corsa 1ltr?

Yes, the Opel Corsa 1.0L typically has two oxygen sensors: one located before the catalytic converter (upstream) and another after it (downstream). The upstream sensor monitors the air-fuel mixture, while the downstream sensor checks the efficiency of the catalytic converter. However, it's always best to consult the specific vehicle's manual or a professional for confirmation, as configurations can vary by model year and engine type.