Fuel and Exhaust System

Catalytic Converter

~1min read

GENERAL INFORMATION

The catalytic converter is a reliable and simple device that requires no maintenance.

However, there are facts the vehicle owner must know if the catalytic converter is to function properly throughout its service life.

Do not use leaded gasoline in a vehicle equipped with a catalytic converter. Lead will coat the precious metals, reducing their effectiveness and eventually destroying the converter.

If the engine begins to misfire, do not drive the vehicle (or drive as little as possible) until the cause of the malfunction is corrected.

Do not attempt to start the engine by pushing or towing the vehicle. This will allow unburned fuel to enter the catalytic converter, causing it to overheat after the engine starts.

Do not turn off the ignition while the engine is running at high speed, i.e., do not depress the accelerator pedal immediately before switching off the ignition.

Do not use fuel or engine oil additives. They may contain substances that are harmful to the catalytic converter.

Do not drive the vehicle if the engine burns oil to the extent that blue smoke is visible.

Remember that the catalytic converter operates at very high temperatures. Therefore, do not park the vehicle in tall dry grass or on piles of dry leaves after a long drive.

Remember that the catalytic converter is very fragile. Do not strike it during vehicle repair.

In some cases, a sulfur smell (similar to rotten eggs) may come from the tailpipe. This is a common occurrence in new vehicles equipped with a catalytic converter. The smell should disappear after several thousand kilometers of driving.

A catalytic converter on a vehicle that has been regularly maintained and properly driven should last from 80,000 to 150,000 km. However, if the catalytic converter loses its efficiency before this time, it must be replaced.

Test yourself

A quick Nissan Sunny quiz: every answer comes with an explanation and a link to the manual page.