Question

2008 Volvo S40 1.6L with engine code P1103, O2 sensor heating circuit bank 1 - sensor output too low. What does the code mean?

Answer 1

Hi there

This code is in fact for the bank 1 sensor 1 heater circuit of the O2 sensor. Most of the time this code is a result of a burned out heater circuit in the O2 sensor itself. Usually replacing the sensor will resolve the problem.