Engine-Codes - Pontiac - P0139 Pontiac

P0139 Pontiac Code - HO2S Slow Response Bank 1 Sensor 2

- Code Popularity: 374 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P0139 Pontiac?

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 Heated Oxygen Sensor (HO2S) Bank 1 Sensor 2
  • HO2S Bank 1 Sensor 2 harness is open or shorted
  • HO2S Bank 1 Sensor 2circuit poor electrical connection
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How to Fix the DTC P0139 Pontiac?

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 Pontiac 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)

What Does the P0139 Pontiac Code Mean?

The Powertrain Control Module (PCM) provides a .45 volt reference signal to the Heated Oxygen Sensor (HO2S) through the Bank 1 high signal circuit. When HO2S is cold, less than 392°F (200°C), the sensor signal voltage will be about .45 volt and PCM will keep the system in an open loop. When HO2S is warm, sensor voltage will swing from rich to lean rapidly, at least one switch every 2 seconds, if PCM is in good control of air/fuel mixture. If the oxygen sensor is slow to respond to changes in exhaust oxygen content, the Diagnostic Trouble Code (DTC) will set.

P0139 Pontiac Code - HO2S Slow Response Bank 1 Sensor 2

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