Articles Tagged: OBD-II codes

Catalyst System Efficiency Below Threshold – Bank 1 What it means: OBD-II code P0420 represents a problem with the catalyst system on your Toyota. The catalytic converter on your Toyota is an integral part of your vehicle’s exhaust system. This part looks like a small muffler, but its purpose is to reduce vehicle emissions through […]

Insufficient EGR Flow What it means: OBD-II code P0401 represents a problem with your EGR system Exhaust gas recirculation is referred to as EGR, and it’s an integral part of your Toyota’s emissions system. The EGR is used to reduce the combustion temperature and pressure to limit oxides of nitrogen. There are three parts to the […]