Posts Tagged: catalytic converter diagnosis
How to Diagnose a Bad Catalytic Converter the Right Way
How to Diagnose a Bad Catalytic Converter: What Experienced Mechanics Actually Look For Quick Summary There are no wear parts inside a Catalytic Converter, so they don’t die on their own; they’re murdered. If they’re fed too much fuel, oil, or coolant, they can overheat and melt. Misfires, internal leaks, cold-water shock, and impacts are the most common causes of catalytic converter failure. In other words, a bad catalytic converter isn’t the cause; it’s the result of another problem. When diagnosing a bad catalytic converter, I never rely on a … Read More
Most Common Causes of Catalytic Converter Failure
Top Reasons Catalytic Converters Go Bad Quick Summary The most common causes of catalytic converter failure are • Engine misfires — Misfires cause incomplete combustion that dumps unburned fuel into the exhaust, causing the catalytic converter to foul, overheat, and melt. • Rich fuel mixtures — Leaking fuel injectors or rich fuel mixtures cause extra fuel to enter the exhaust and damage the catalytic converter. • Oil or coolant contamination — Oil burning, internal oil, or coolant leaks can coat the precious metals inside the catalytic converter, rendering them inoperative. … Read More
P0420 or P0430 No Other Codes? Here’s What I Check First
P0420 or P0430 With No Other Codes: How I Diagnose It Without Wasting Money Quick Summary If you have a P0420 or P0430 with no other codes, don’t automatically assume the catalytic converter is bad without additional testing. In my experience, the converter is often the culprit, but it’s not the only possibility. I always begin by confirming there are truly no additional engine, fuel trim, misfire, or oxygen sensor codes, then inspect for exhaust leaks and analyze live scan data before recommending an expensive converter replacement. Following a logical … Read More