For Shop Owners

P0139 - O2 Sensor Circuit Slow Response Bank 1 Sensor 2

Repair Importance Level: 2/3
Repair Difficulty Level: 2/3 What does this mean?

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
  • Inappropriate fuel pressure
  • Faulty fuel injectors
  • Intake air leaks may be faulty
  • Exhaust gas leaks
What does this mean?

Tech notes

Replacing the Rear Heated Oxygen Sensor Bank 1 usually takes care of the problem.
What does this mean?

When is the code detected?

The P0139 code is set when the Engine Control Module (ECM) detects that the rear O2 sensor takes more time to respond between rich and lean than the specified time.

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • High Fuel Consumption
  • Excessive Smoke from Exhaust

P0139 Description

The Heated Oxygen Sensor 2 (HO2S), 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 P0139 - O2 Sensor Circuit Slow Response Bank 1 Sensor 2 -

P0139 Information for specific makes

P0139 ACURA HO2S Bank 1 Sensor 2 Slow Response
P0139 AUDI HO2S12 Sensor Circuit Slow Response
P0139 BMW O2 Sensor Circuit Slow Response Bank 1 Sensor 2
P0139 CHRYSLER O2 sensor 1/2 Slow response
P0139 DODGE O2 sensor 1/2 Slow response
P0139 FORD O2 Sensor Circuit Slow Response Bank 1 Sensor 2
P0139 HONDA HO2S Bank 1 Sensor 2 Slow Response
P0139 HYUNDAI HO2S Circuit Slow Response Bank 1 Sensor 2
P0139 INFINITI HO2S12 Slow Response
P0139 JEEP O2 sensor 1/2 Slow response
P0139 KIA HO2S12 Circuit Slow Response
P0139 LEXUS HO2S12 Circuit Slow Response
P0139 MAZDA HO2S RR Circuit Problem
P0139 MERCEDES-BENZ O2 Sensor Circuit Slow Response Bank 1 Sensor 2
P0139 MINI O2 Sensor Circuit Slow Response Bank 1 Sensor 2
P0139 MITSUBISHI Cylinder 1-4 Heated Oxygen Rear Sensor Circuit Slow Response
P0139 NISSAN HO2S12 Slow Response
P0139 SCION Oxygen Sensor Circuit Slow Response (Bank 1 Sensor 2)
P0139 SUBARU HO2S12 Circuit Slow Response
P0139 TOYOTA HO2S12 Circuit Slow Response
P0139 VOLKSWAGEN HO2S12 Sensor Circuit Slow Response

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P0139 Comments

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Any information is appreciated. Thanks
Repair Importance Level: 2
1=Low 2=Medium 3=High
Repair Difficulty Level: 2
1=Easy 2=Moderate 3=Hard

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