Which gas is generally considered to be the rich indicator? (The ...

[Tirant22]

Question 1

Which gas is generally considered to be the lean indicator? (The higher the level of this gas, the leaner the air-fuel mixture.)
◦ HC
◦ CO
◦ CO₂
◦ ^O2

Question 2

Which gas is generally considered to be the rich indicator? (The higher the level of this gas, the richer the air-fuel mixture.)
◦ HC
◦ CO
◦ CO₂
◦ ^O2

[kiamars2010]

Answer 1

^O2

Answer 2

CO

[Tirant22]

TYSM

[FergA]

Thanks for the timely response, appreciate it