Engine-Codes - Honda - P0139 2010 Honda Accord

P0139 2010 Honda Accord Code - HO2S Bank 1 Sensor 2 Slow Response

- Code Popularity: 8,410 Views
- Repair Importance Level: 2/3
- Repair Difficulty Level: 2/3
Table of contents

|What are the Possible Causes of the Code P0139 2010 Honda Accord?

  • 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

|How to Fix the P0139 2010 Honda Accord Code?

Start by checking 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's pins.

|Code P0139 2010 Honda Accord Tech Notes

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

|What is the Cost to Diagnose the Code P0139 2010 Honda Accord?

Labor: 1.0

The cost to diagnose the P0139 2010 Honda Accord code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

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|When is the P0139 2010 Honda Accord 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.

|What are Code P0139 2010 Honda Accord Possible Symptoms?

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

|What Does the P0139 2010 Honda Accord Code Mean?

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.

HO2S Bank 1 Sensor 2 Slow Response

|Need more Information on the P0139 2010 Honda Accord Code?

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|Need Help with the P0139 2010 Honda Accord Code?

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