🔧 How do you know if your oxygen sensor is bad? Today, our friend OMAR VW shows us how to detect a faulty heater in a post-catalyst oxygen sensor using the Power Probe DM500MAX! 🔥 ✅ With the multimeter set to resistance mode and a quick continuity check, Omar demonstrates a fast, clear, and 100% effective way to test the sensor’s heater circuit. 🎯 If you want to diagnose like a pro and avoid unnecessary replacements, this is the kind of real-world tip you don’t want to miss. 📲 Check out the