Exam 86: Catalytic Converters

A P0422 (catalytic converter efficiency failure) is set. What is a possible cause?

What term describes a catalytic converter as it reaches its effective temperature?

The addition of cerium to catalytic converters provided what benefit?

Two technicians are discussing catalytic converters. Technician A says that the exhaust mixture must fluctuate between rich and lean for the best efficiency. Technician B says that the air-fuel mixture must be leaner than 14.7:1 for best performance from a three-way catalytic converter. Which technician is correct?

Which exhaust gas reading indicates a good catalytic converter?

When observing O2S waveforms on a DSO on an OBD-II vehicle, which O2 sensor should have more oscillations in its O2S waveform?

Some vehicles have a "mini converter." Where is this component located?

What is applied to the ceramic substrate to make the surface porous?

What is the minimum ECT temperature value required for the catalyst efficiency monitor to run under OBD-II?

A catalytic converter can be harmed by ________.

A catalytic converter has to be at least how hot before it begins to work?

What two primary sensors does the PCM use to check the catalytic converter?

Technician A says that the catalytic converter is warranted for 8 years or 80,000 miles, whichever comes first. Technician B says that after replacing the catalytic converter, the old converter must be kept for possible inspection for 60 days. Which technician is correct?

Technician A says that a converter that rattles when tapped with a mallet should be replaced. Technician B says that the root cause of the converter failure should be diagnosed and repaired before a replacement converter is installed. Which technician is correct?

To prevent catalytic converter damage, do not crank a flooded engine longer than ________ seconds.

A catalytic converter is being tested with an infrared pyrometer. Which is an acceptable result?

Two technicians are discussing the testing of a catalytic converter. Technician A says that a vacuum gauge can be used and observed to see if the vacuum drops with the engine at 2500 RPM for 30 seconds. Technician B says that a pressure gauge can be used to check for backpressure. Which technician is correct?