Skoda Praktik O2 Sensor Issue

Sounds familiar. I had a similar issue with my Skoda Octavia. The check engine light and increased fuel consumption are classic signs of an O2 sensor problem. Have you checked the exhaust system for any leaks? A faulty catalytic converter can also trigger similar symptoms and mess with the air-fuel ratio. The exhaust sensor itself might be fine, but a leak upstream could be throwing off the readings.

Thanks for the quick response. You mentioned the exhaust system and catalytic converter. How would a leak there influence the O2 sensor readings specifically? I'm trying to understand the connection between these components and the air-fuel ratio.

Okay, so the leak messes with the air-fuel ratio before it reaches the O2 sensor. The sensor is there to measure how much oxygen is in the exhaust. If there's a leak, extra air gets in, and the sensor thinks the engine is running lean, too much air. It tries to compensate by adding more fuel, hence the higher consumption. But if the cable is damaged as you mentioned, it could also be that the signal is incorrect. Honestly, with a diesel, it’s best to get it checked by someone who knows these engines. I'd recommend a workshop with experience in exhaust systems and catalytic converters. They will be able to pinpoint the exact problem.

Thank you for the advice. It was indeed the O2 sensor. The cable leading to it was damaged. I had it repaired at a workshop for 95€. Now the error is gone, and hopefully, the fuel consumption will return to normal.