can a bad vias valve cause a p0420 code

Question

i have a bad vias control valve
can that cause a p0420 code

Answer 1

HI there

This will normally not cause the converter code. This will usually cause low power on take off, but if you have a code for the converter you will have to check for exhaust leaks, improper timing or a poorly running engine. Sometimes you will get this code from a faulty rear O2 sensor as well.