When diagnosing an emission test failure, you should baseline the exhaust gas levels. What does this mean? A. Calibrate the exhaust gas analyzer. B. Warm up the exhaust gas analyzer and record the gas...

When diagnosing an emission test failure, you should baseline the exhaust gas levels.

What does this mean?

A. Calibrate the exhaust gas analyzer.

B. Warm up the exhaust gas analyzer and record the gas levels while it is sampling ambient air.

C. Record the exhaust gas readings from the vehicle before making any repairs.

D. Record the exhaust gas readings from the vehicle after the repairs are complete.