P0420 - pnd

Question

my 2010 Honda accord when I run the diagnostics test 3 different po420 codes come up does that mean I should change the hole catylst converter or just try changing the o2 sensors

Answer 1

HI there,

Most of the time with the P0420 code the converter is the problem. Sometimes this code will happen if you have a faulty rear O2 sensor, leak in the exhaust or if the engine is running poorly.