An exhaust emission test shows high CO readings. Which of these could be the cause?
A) Non-functioning catalytic converter
B) Fuel pressure too high
C) Clogged air filter
D) Any of these could cause high CO readings

Question

Quizplus · Accepted Answer

Any of these could cause high CO readings. CO (carbon monoxide) is produced when fuel is not fully burned due to a variety of reasons such as a malfunctioning catalytic converter, high fuel pressure, or clogged air filter. Therefore, any of these issues (as well as other potential issues) could cause high CO readings.

An Exhaust Emission Test Shows High CO Readings