Puma Oxygen Sensor Heater Circuit Error

It certainly sounds like a plausible diagnosis. The symptoms you've described, along with the error code, strongly suggest a problem with the oxygen sensor or its associated heater circuit. Have you inspected the wiring and plug connection to the sensor? A damaged cable or a loose connection could very well be the culprit.

Thank you for the quick response. I have visually checked the wiring and connector, and I didn't observe any obvious damage. Is there a specific method for thoroughly testing the sensor and the heater circuit's functionality?

While a visual inspection is a good first step, a more definitive test would involve using a multimeter to check for voltage and continuity at the sensor connector. If you're not comfortable performing electrical testing, I would advise consulting a qualified technician. Given your symptoms, and the potential complexity of diagnosing sensor issues, a workshop visit would be a sensible next step.

Thank you for the advice. I followed your suggestion and took the Puma to a workshop. As suspected, the cable or plug connection of the component was defective. The repair cost me 95€. The problem is now resolved.