P1151

P1151 OBD Code Definition:
P1151 Lack Of HO2S21 Switch – Sensor Indicates Lean
P1151 OBD Code Description:

Possible Symptoms

  • Malfunction Indicator Lamp (MIL) active
  • Engine Light ON (or Service Engine Soon Warning Light)

Possible Causes

  • Intake System faulty/leaking
  • Fuel Pressure, Fuel Pressure Regulator and Fuel Pump faulty
  • Fuel Injectors faulty/leaking
  • Exhaust System faulty/leaking
  • Activated-Charcoal Filter/System faulty/leaking
  • Secondary Air Injection System faulty/leaking
  • Lambda/Oxygen Sensor(s) before Catalytic Converter faulty
  • Lambda/Oxygen Sensor(s) after Catalytic Converter faulty

Possible Solutions

  • Check Intake System for Leaks
  • Check Fuel Pressure, Fuel Pressure Regulator and Fuel Pump
  • Check Fuel Injectors
  • Check Exhaust System for Leaks
  • Check Activated-Charcoal Filter/System
  • Check Secondary Air Injection System
  • Check Lambda/Oxygen Sensor(s) before Catalytic Converter
  • Check Lambda/Oxygen Sensor(s) after Catalytic Converter

 

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