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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?
