THE Lambda probe (Oxygen sensor) It needs to reach a high temperature (300º or more) to function correctly. For it to start sending accurate data to the ECU (injection module) quickly, most sensors have a… heating element internal.
The main function of this resistor is to ensure that, even during a cold start, the engine can enter emissions control and optimized fuel consumption mode as quickly as possible. When this resistor fails (which is common), the sensor takes a long time to heat up using only the exhaust heat.
The most visible symptom is Immediate illumination of the injection light on the dashboard, often accompanied by slightly irregular idle or increased consumption in the first few kilometers. This occurs because, without a quick reading from the sensor, the ECU operates with a standard, richer fuel mixture. The failure of the internal resistance requires the Complete Lambda Sensor Replacement, and it is recommended to use high-quality parts to ensure accurate reading.
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