Oxygen sensors

[ossy]

Hi,I have a question,

I recently Replaced 'broken' oxygen sensors with some used oxygen sensors. (the computer says faults in upstream and downstream sensors)

Since then the engine is not running well, especially when cold.
The Cat smells like rotten eggs.

who knows how many ohms the heating element of oxygen sensor has
I have a few used oxygen sensors from dismanteld smarts.
So i can check them before i fit them or buy new ones.

Kind Regards, Oscar

[ossy]

Problem solved.
tested a few used and new oxygen sensors.