Skoda Karoq O2 Sensor Issue

Aged O2 sensors are a common issue. Considering the mileage, it's not surprising. Before replacing the sensor, I would inspect the wiring and connectors. A faulty connection can trigger similar symptoms, including the check engine light and impacting fuel efficiency. Has the catalytic converter been inspected recently?

Thanks for the advice. I'll check the wiring and connectors. You mentioned inspecting the catalytic converter. What am I looking for? How is that related to the O2 sensor issue?

The O2 sensor monitors the catalytic converter's efficiency. If the catalytic converter isn't working correctly, it can affect the readings from the O2 sensor and trigger a fault code, and the opposite is also true. Since you're already experiencing issues related to the O2 sensor and suspect a wiring problem, addressing that first is a logical step. However, if replacing the sensor doesn't resolve the issue, further investigation of the catalytic converter might be needed. Given your description and mileage, having a workshop confirm your diagnosis might be the best course of action.

Just letting you know, the shop confirmed it was the O2 sensor. They found a faulty connection, just as suspected. A new sensor was installed, the connection was fixed, and the check engine light is off. Fuel efficiency seems normal again. The total cost was 95€. Thanks for the help!