J Jerry H New member Oct 4, 2010 #1 Hola, I just replaced the 2nd catalytic converter and all o2 sensors and my mileage is still low 40's and it should be upper 40 to low 50's. The tire pressure and air filter are fine. Is there a breakin period with converters?
Hola, I just replaced the 2nd catalytic converter and all o2 sensors and my mileage is still low 40's and it should be upper 40 to low 50's. The tire pressure and air filter are fine. Is there a breakin period with converters?
