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“Why does my Check Engine Light keep coming back?” — Understanding the Science of O2 Sensor Spacers We’ve all been there. You clear the code with your scanner, drive for twenty miles, and just as you’re feeling confident—ding—the orange light returns. If you are asking, "What is the most reliable way to stop a P0420… Read more: Is an O2 sensor spacer the best way to fix a persistent P0420 code in 2026?
Troubleshooting persistent P0420 codes and understanding the “hidden” logic of car ECUs. Have you ever spent hundreds of dollars on a brand-new Oxygen sensor, only to have that frustrating orange “Check Engine” light pop back up two days later? You aren’t alone. It’s one of the most common questions we receive from DIY mechanics and… Read more: Why is my Check Engine Light still on after replacing the O2 sensor? (And how to fix it for good)
