Chapter 86 Catalytic Converters Exam Questions And Answers 2026

CHAPTER 86 CATALYTIC CONVERTERS
EXAM QUESTIONS AND ANSWERS 2026

A catalytic converter can be harmed by ________.
Select one:
a. sulfur from poor-quality fuel
b. antifreeze
c. excessive engine oil
d. Any of the above - ANSWERSd. Any of the above

A catalytic converter has to be at least how hot before it begins to work?
Select one:
a. 500 degrees F
b. 1,500 degrees F
c. 1,000 degrees F
d. 2,000 degrees F - ANSWERSa. 500 degrees F

A catalytic converter is being tested with an infrared pyrometer. Which is an acceptable
result?
Select one:
a. The outlet should be hotter than the inlet by 10%
b. Both the inlet and outlet should be the same temperature after the converter reaches
operating temperature
c. The inlet should be hotter than the outlet by 10%
d. The temperature of a catalytic converter is the best test to perform to locate a
restricted unit - ANSWERSa. The outlet should be hotter than the inlet by 10%

A P0422 (catalytic converter efficiency failure) is set. What is a possible cause?
Select one:
a. Fuel contamination
b. Exhaust leak
c. Engine mechanical fault
d. Any of these - ANSWERSd. Any of these

All these are causes of catalytic converter failure EXCEPT ________.
Select one:
a. Contamination
b. Incorrect air/ fuel mixture
c. Excessive temperature
d. All of these are causes of converter failure. - ANSWERSd. All of these are causes of
converter failure.