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P0139 Honda Code - Secondary Heated Oxygen Sensor 2 Slow Response

- Code Popularity: 84,298 Views
- Repair Importance Level: 2/3
- Repair Difficulty Level: 2/3
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What are the Possible Causes of the DTC P0139 Honda?

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)
⚠ Does your Honda have Safety Recalls? → Check here

How to Fix the DTC P0139 Honda?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Code Tech Notes

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





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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0139 Honda code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to 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

Code P0139 Honda Description

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).

OBDII Code P0139 Honda - Secondary Heated Oxygen Sensor 2 Slow Response - AutoCodes.com
P0139 Honda Code - Secondary Heated Oxygen Sensor 2 Slow Response

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Code P0139 Honda comments

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