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6 Symptoms of a Faulty O2 Sensor | Engine Misfires, Poor Gas Mileage & More

In this video, you will learn the warning signs of a failing or faulty oxygen sensor in your car. This automotive repair video covers: What an oxygen sensor does and why it's important for engine performance The 6 common symptoms of a bad oxygen sensor: 1. Poor fuel economy 2. Rough idle 3. Hesitation and lack of power 4. Failed emissions test 5. "Rotten egg" smell from exhaust 6. Flashing check engine light Potential causes leading to oxygen sensor failure: Age and high mileage Oil contamination Leaded gasoline or fuel additives Electrical damage Excessive exhaust heat How to diagnose a faulty oxygen sensor: Scan for diagnostic trouble codes related to oxygen sensors Use a multimeter to check sensor signal voltage Monitor in real-time with a live data scanner Before replacing your oxygen sensor, check for exhaust leaks that could impact readings. Often, the most cost-effective solution is to replace the oxygen sensor. For a more detailed checklist on diagnosing this issue, read our recent blog post here: https://www.autocornerd.com/car-idles... #oxygensensor #checkenginelight #OBD2 Timecode: 00:00:00 - Introduction 00:00:04 - Recognizing a bad oxygen sensor 00:00:08 - Function of an oxygen sensor 00:00:12 - Types of oxygen sensors 00:00:18 - Focus on the upstream sensor 00:00:22 - Importance of the air-fuel ratio 00:00:26 - Sensor contamination 00:00:31 - Rich or lean air-fuel mixture 00:00:36 - Key symptoms of a bad sensor 00:00:41 - Symptom 1: Poor Fuel Economy 00:00:50 - Symptom 2: Rough Idle 00:01:23 - Symptom 3: Hesitation or Lack of Power 00:01:46 - Symptom 4: Failed Emissions Test 00:02:22 - Symptom 5: "Rotten Egg" Smell 00:02:54 - Symptom 6: Flashing Check Engine Light 00:03:11 - Causes of sensor failure 00:03:38 - Cause 1: Age and Mileage 00:03:47 - Cause 2: Oil Contamination 00:03:55 - Cause 3: Leaded Gasoline and Fuel Additives 00:04:01 - Cause 4: Electrical Damage 00:04:06 - Cause 5: Excessive Exhaust Heat 00:04:20 - Diagnosing a faulty sensor 00:04:24 - Using an OBD2 Scanner 00:04:32 - Measuring signal voltage 00:04:50 - Live data scanner 00:04:54 - Exhaust leaks 00:05:00 - Cleaning vs. Replacing the sensor 00:05:04 - Cleaning limitations 00:05:19 - Replacement recommendation 00:05:27 - Conclusion and recommendations 00:05:32 - Outro and additional resources