Will a bad catalytic converter cause oil to burn

If your car engine is combusting motor oil, caused by worn piston rings or clogged crankcase ventilation, it could cause damages to the catalytic converter really fast. Other causes could be contaminants like unburned fuel caused by misfires. Coolant entering the combustion chamber by a blown head gasket could also cause damage to the honeycomb.

However, within 10 minutes or so, the check engine light came on. I have one of those simple Bluetooth OBD readers which was being used at the time so I scanned the system and got a P0420 code indicating that there is a problem with the efficiency of the CAT. This made me wonder if a failing CAT could possibly cause the burning oil smell.

Catalytic Converter Failure: 3 Common Causes


When a catalytic converter clogs, it reduces airflow, resulting in the engine burning up more fuel. Acceleration is weak, and exhaust flow is insufficient, forcing you to step on the gas pedal more. This will make the engine pump more fuel into the cylinders, resulting in …

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What causes a catalytic converter to go bad?

It can also be due to any number of small design issues or worn-out engine components. The oil that’s burned in the engine ends up flowing through the exhaust system, where it can eventually cause catalytic converter failure in much the same way as a coolant leak.

Are catalytic converters expensive to replace?

Catalytic converters are known to fail and are often very expensive, especially if you are looking for a brand new one. The diagnosis of a defective catalyst is very important to ensure that you do not replace a fully functioning catalyst because of the expensive replacement cost.

Why does my catalytic converter smell like burning sulfur?

When catalytic converters clog, they restrict the airflow of exhaust gases so that the engine of your car runs on a rich air-fuel mixture. The combustion of this excessive mixture causes an odor like rotten eggs. This smell smells like burnt sulfur, which is an obvious indication of your catalytic converter’s malfunction.

What are the symptoms of a clogged catalytic converter?

Here are the most common symptoms when it comes to a damaged or clogged catalytic converter: 1 Check Engine Light. 2 Acceleration Lag. 3 Bad Fuel Average. 4 Sulfur Smell. 5 Discolored Housing. 6 … (more items)

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