Which exhaust gas reading indicates a good catalytic converter?

[fbq8i]

Question 1

When observing O2S waveforms on a DSO on an OBD-II vehicle, which O2 sensor should have more oscillations in its O2S waveform?
◦ Upstream
◦ Downstream
◦ They will be equal
◦ None of these

Question 2

Which exhaust gas reading indicates a good catalytic converter?
◦ O₂ is zero
◦ CO is zero
◦ Both A and B
◦ Neither A nor B

[Jane]

Answer 1

Upstream

Answer 2

CO is zero

[fbq8i]

Excellent

[sultansheikh]

Wow, this really help