P1174 Subaru Fuel Trim Cylinder Balance Bank 1

Possible causes

– Faulty Oxygen sensor
– Ignition problem
– Fuel injection problem
– Engine mechanical condition

Tech description

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P1174 Subaru Description

The Engine Control Module (ECM) performs a fuel trim cylinder balance utilizing the HO2S, when the calculated accumulated voltage exceeds a predetermined level this code is set