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OBD2-OBDII Codes | Engine-Codes.com

P0138

P0138 - O2 Sensor Circuit High Voltage Bank 1 Sensor 2

Possible causes
- Faulty Rear Heated Oxygen Sensor Bank 1
- Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
- Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Intake air leaks
- Exhaust gas leaks
- Inappropriate fuel pressure
- Faulty fuel injectors
Tech notes
Replacing the Rear Heated Oxygen Sensor Bank 1 usually takes care of the problem.
When is the code detected?
The P0138 code is set when the Engine Control Module (ECM) detects that the rear O2 sensor signal voltage remains excessively high for an extended period of time.
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- High Fuel Consumption
- Excessive Smoke from Exhaust
P0138 Description
The Heated Oxygen Sensor 2 (HO2S) (Rear O2 Sensor), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. For optimum catalyst operation, the air fuel mixture (air-fuel ratio) must be maintained near the ideal stoichiometric ratio. The HO2S output voltage changes suddenly in the vicinity of the stoichiometric ratio. The Engine Control Module (ECM) adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric. The HO2S generates a voltage between 0.1 and 0.9 V in response to oxygen in the exhaust gas. If the oxygen in the exhaust gas increases, the air-fuel ratio becomes Lean. The ECM interprets Lean when the HO2S voltage is below 0.45 V. If the oxygen in the exhaust gas decreases, the air-fuel ratio becomes Rich. The ECM interprets Rich when the HO2S voltage is above 0.45 V.
OBDII Code P0138 - O2 Sensor Circuit High Voltage Bank 1 Sensor 2 - Engine-Codes.com
P0138 For specific makes
P0138 LEXUS
P0138 SCION
P0138 TOYOTA
P0138 ACURA
P0138 HONDA
P0138 BMW
P0138 CHRYSLER
P0138 DODGE
P0138 JEEP
P0138 JAGUAR
P0138 FORD
P0138 HYUNDAI
P0138 INFINITI
P0138 NISSAN
P0138 ISUZU
P0138 KIA
P0138 MAZDA
P0138 MITSUBISHI
P0138 SUBARU
P0138 AUDI
P0138 VOLKSWAGEN
P0138 BUICK
P0138 CADILLAC
P0138 CHEVROLET
P0138 GMC
P0138 PONTIAC
P0138 SATURN
P0138 2002 NISSAN ALTIMA SEDAN
P0138 2003 NISSAN ALTIMA SEDAN
P0138 2004 NISSAN ALTIMA SEDAN
P0138 2005 NISSAN ALTIMA SEDAN
P0138 2006 NISSAN ALTIMA SEDAN
P0138 2002 NISSAN SENTRA
P0138 2003 NISSAN SENTRA
P0138 2004 NISSAN SENTRA
P0138 2005 NISSAN SENTRA
P0138 2006 NISSAN SENTRA
P0138 MERCEDES-BENZ
P0138 2003 INFINITI G35
P0138 2004 INFINITI G35
P0138 2005 INFINITI G35
P0138 2006 INFINITI G35
P0138 2006 NISSAN MAXIMA
P0138 2005 NISSAN MAXIMA
P0138 2005 SCION XB
P0138 2006 SCION XB
P0138 2007 SCION XB
P0138 2004 NISSAN MAXIMA
P0138 2007 NISSAN MAXIMA
P0138 2008 NISSAN MAXIMA
P0138 2008 HONDA ACCORD
P0138 2009 HONDA ACCORD
P0138 2010 HONDA ACCORD
P0138 2008 NISSAN ALTIMA SEDAN
P0138 2009 NISSAN ALTIMA SEDAN
P0138 2010 NISSAN ALTIMA SEDAN
P0138 2011 NISSAN ALTIMA SEDAN
P0138 2012 NISSAN ALTIMA SEDAN
P0138 1997 FORD F150
P0138 1998 FORD F150
P0138 1999 FORD F150
P0138 2000 FORD F150
P0138 2001 FORD F150
P0138 2002 FORD F150
P0138 2003 FORD F150
P0138 2001 TOYOTA HIGHLANDER
P0138 2002 TOYOTA HIGHLANDER
P0138 2003 TOYOTA HIGHLANDER
P0138 2004 TOYOTA HIGHLANDER
P0138 2005 TOYOTA HIGHLANDER
P0138 2006 TOYOTA HIGHLANDER
P0138 2007 TOYOTA HIGHLANDER
P0138 2004 TOYOTA PRIUS
P0138 2005 TOYOTA PRIUS
P0138 2006 TOYOTA PRIUS
P0138 2007 TOYOTA PRIUS
P0138 2008 TOYOTA PRIUS
P0138 2009 TOYOTA PRIUS
P0138 2008 NISSAN ROGUE
P0138 2009 NISSAN ROGUE
P0138 2010 NISSAN ROGUE
P0138 2011 NISSAN ROGUE
P0138 2012 NISSAN ROGUE
P0138 2013 NISSAN ROGUE
P0138 1996 HONDA CIVIC
P0138 1997 HONDA CIVIC
P0138 1998 HONDA CIVIC
P0138 1999 HONDA CIVIC
P0138 2000 HONDA CIVIC
P0138 2007 NISSAN SENTRA
P0138 2008 NISSAN SENTRA
P0138 2009 NISSAN SENTRA
P0138 2010 NISSAN SENTRA
P0138 2011 NISSAN SENTRA
P0138 2012 NISSAN SENTRA
P0138 2007 TOYOTA CAMRY
P0138 2006 TOYOTA CAMRY
P0138 2008 TOYOTA CAMRY
P0138 2009 TOYOTA CAMRY
P0138 2010 TOYOTA CAMRY
P0138 2011 TOYOTA CAMRY
P0138 2006 FORD FUSION
P0138 2007 FORD FUSION
P0138 2008 FORD FUSION
P0138 2009 FORD FUSION
P0138 2010 FORD FUSION
P0138 2011 FORD FUSION
P0138 2012 FORD FUSION
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