Ford Escape Automobiles Forum banner
1 - 1 of 1 Posts

·
Premium Member
Joined
·
3,620 Posts
Expanding just a little, the ECM uses O2 sensors to determine the activity of a catalytic converter. There are no measuring or instrumentation of the 3rd converter, at least for that model year. The other two upstream converters measure the gases before and after the converter has done its work, so would likely by design indicate whether the converter is present and its efficiency or operating characteristics.
tom
 
1 - 1 of 1 Posts
Top