Engine-Codes - Acura - P0139 Acura

P0139 Acura Code - Secondary Heated Oxygen Sensor 2 Slow Response

- Code Popularity: 19,658 Views
- Repair Importance Level: 2/3
- Repair Difficulty Level: 2/3
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What are the Possible Causes of the DTC P0139 Acura?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Secondary Heated Oxygen Sensor 2
  • Secondary Heated Oxygen Sensor 2 harness is open or shorted
  • Secondary Heated Oxygen Sensor 2 circuit poor electrical connection
  • Exhaust system failure (exhaust gas leak)

Code Tech Notes

Replacing the Rear Heated Oxygen Sensor Bank 1 usually takes care of the problem.





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How to Fix the DTC P0139 Acura?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P0139 Acura code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

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

What Does the P0139 Acura Code Mean?

The Secondary Heated Oxygen Sensor (Secondary HO2S (Sensor 2)) detects the oxygen content in the exhaust gas downstream of the three-way catalytic converter (TWC) during stoichiometric air/fuel ratio feedback control. The Powertrain Control Module (PCM) controls the air/fuel ratio with the Air/Fuel Ratio (A/F) Sensor (Sensor 1) output voltage to optimize the TWC's efficiency. When the Secondary HO2S (Sensor 2) does not change during lean air/fuel ratio when the throttle is closed, after the full current is applied to the Secondary HO2S (Sensor 2) heater, and output remains within the specified range continuously, the PCM detects a malfunction and stores a Diagnostic Trouble Code (DTC).

P0139 Acura Code - Secondary Heated Oxygen Sensor 2 Slow Response

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