Downstream 02 sensor

[Hunter verner]

Do you need the downstream 02 sensor in a 1996 pontiac sunfire es 2.2 or can you just disconnect it or just leave it it throws a 02 sensor code and what the purpose of the downstream 02 sensor

 

[melsg5]

It monitors the efficiency of the catalytic converter. Disconnecting it will still give you a check engine light. If you ignore the light and something else throws a code you won't know it since you will assume it's the O2 sensor. Why not replace it?

 

[Hunter verner]

It monitors the efficiency of the catalytic converter. Disconnecting it will still give you a check engine light. If you ignore the light and something else throws a code you won't know it since you will assume it's the O2 sensor. Why not replace it?

I don't have catalytic converter

 

[melsg5]

I don't have catalytic converter

So how is your ECM going to properly control the engine and you should also have other codes.