What do you feel? The car instantly becomes a gas guzzler. At times, you can smell a strong odor of rotten eggs or sulfur coming from the exhaust. Performance becomes unstable, with the car jerking slightly at a constant speed.
The Logic of the System: The engine has two “noses”: Sensor 1 (before the catalytic converter) and Sensor 2 (after). They smell the exhaust to determine if combustion was good. If the code is… Heating CircuitThis means that the internal resistance of the probe has burned out. It is “cold” and cannot work until the engine heats up considerably.
- The Diagnostic Error: Many people replace the sensor and the error returns. Why? Because the problem may be in the electrical wiring harness that runs near the exhaust and has melted, or in a 15A fuse in the engine compartment that powers the sensor heaters.
- Pro Tip: If the fault is in Oxygen Sensor 2, the car will only pollute more. If it’s in Oxygen Sensor 1, the car loses its injection map and fuel consumption doubles.
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