P1148 Code: Meaning, Causes, and Symptoms | OBD2 Codes

P1148 – Closed Loop Control Function Bank 1

 

P1148 Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

P1148 Possible Causes

 

Faulty Heated Oxygen Sensor 1 Bank 1,Heated Oxygen Sensor 1 Bank 1 circuit is open or shorted,Heated Oxygen Sensor 1 Bank 1 circuit electrical connection

 

P1148 Description

 

The Engine Control Module (ECM) performs ON/OFF duty control of the Air Fuel Ratio (A/F)/Heated Oxygen Sensor 1 heater corresponding to the engine operating condition to keep the temperature of Air Fuel Ratio (A/F)/Heated Oxygen Sensor 1 element at the specified range.