Question

What is OBD code P0155 for 2003 Chevrolet S10 4.3L?

Answer 1

Hi there,

This code is for the O2 sensor heater circuit on bank 2 sensor 1. This is the O2 sensor on bank 2 BEFORE the catalytic converter. In most cases the sensor heater is bad inside and once the sensor is replaced the system returns to normal.