Laguna oxygen sensor cable issue

I had a similar issue with my Laguna. Same symptoms: check engine light, bad fuel consumption. The error memory had stored an error related to vehicle emissions. Have you tested the oxygen sensor? A malfunction indicator could also signal a problem with the air-fuel ratio.

You're kidding, right? No, I haven't tested the O2 sensor. How did you resolve it, specifically? What steps did you take?

Okay, it sounds like we had the same problem. Honestly, I didn't mess with the sensor testing myself. My knowledge about the air-fuel ratio is limited. I took it straight to a workshop. It was indeed the oxygen sensor and the cable connection was defective. You could probably fix it yourself, but I'd recommend professional help to make sure it's done correctly.

Thanks for the insight! Took it to the shop, just like you said. It was the cable and plug connection for the oxygen sensor. Cost me 95€, but at least the light is off and the car is running right again!