At 322K miles my 2007 4CYL Accord SE had a CEL and the following codes:
P0134: A/F Sensor (Sensor 1) Heater System Malfunction
P1157: A/F Sensor (Sensor 1) AFS Circuit High Voltage
These are codes for the upstream air/fuel (LAF) "Oxygen" sensor heater circuit. Due to the fault, the engine was...