P0421 code

[Fummins]

Yeah I get that there are two o2 sensors in engine bay but I'm pretty sure there is another (third) o2 sensor under the car AFTER the second cat. This is a US mirage so there might be extra emission controls versus your Canadian version

Yeah that must be it. Someone else can try to explain.


JOHNNY???

[Navysteveo87]

I just ended up creating a new thread since this one's so old. Thanks


https://mirageforum.com/forum/showth...0421-CEL-Code)