Concord Auto Repair

🚗 Diagnosing Catalytic Converter Issues the Right Way At Accomplished Auto, we believe in fixing the root of the problem – not just the symptom. One of the most misunderstood parts of your car’s emissions system is the catalytic converter (or "cat" for short). It plays a critical role in cleaning up the exhaust gases before they exit your vehicle. But when a warning light pops up for something like a “catalyst efficiency” code (P0420 or P0430), it doesn’t always mean the catalytic converter itself has failed. In fact, many times it’s doing its job just fine, and something else upstream – like how your engine is running – is causing the problem. That’s why we take the time to test properly, not just replace parts. 🔍 Why a Prop ... read more