Ever wonder why that P0420 or P0430 code keeps coming back even after replacing the catalytic converter? In this Tech Tips Short sponsored by Walker Products, Erik Screeden from Motor Age breaks down why a true fix starts before the new converter goes in. Learn how aging O2 and air-fuel ratio sensors can cause false converter codes — and how replacing them with Walker Products sensors restores performance and efficiency. Don’t waste time (or parts) chasing the wrong problem. Fix it right the fir
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