Test Your Knowledge Quiz Statistics and Answer Key

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Which condition does NOT point to a potentially failed EGR valve?
The correct answer is "Excessive hydrocarbon and carbon monoxide"

Which of these is NOT a symptom of an EGR valve stuck open?
The correct answer is "High oxides of nitrogen (NOX) results on emissions test"

Which of these is NOT a symptom of an EGR valve stuck closed?
The correct answer is "High hydrocarbon (HC) results on emissions test"

What else, besides an EGR valve stuck open, can cause high hydrocarbon emissions?
The correct answer is "Bad oxygen sensor"

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