← View Generic P0139 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

P0139: Oxygen Sensor Circuit Slow Response Bank 1 Sensor 2

on 2020 Chevrolet SILVERADO 1500 PICKUP

Fix Cost
$50 - $250
Parts & Labor
Difficulty
2/5
30 mins - 1 hour
DIY Possible?
✅ Yes
Save money
Your Vehicle
2020 Chevrolet
SILVERADO 1500 PICKUP
⚠️

Important for 2020 Chevrolet SILVERADO 1500 PICKUP Owners

Before starting repairs, verify which engine your 2020 Chevrolet SILVERADO 1500 PICKUP has. Check your VIN or engine code to ensure you order the correct parts.

📖 What Does P0139 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

The downstream oxygen sensor on bank 1 is responding too slowly to exhaust changes.
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Symptoms

  • • Failed emissions test
  • • check engine light
  • • poor catalytic converter monitoring.
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Common Causes

  • • Aging oxygen sensor
  • • contaminated sensor
  • • exhaust leaks
  • • poor sensor connections.
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How to Fix P0139 on 2020 Chevrolet SILVERADO 1500 PICKUP

Replace oxygen sensor, repair exhaust leaks, clean sensor connections, check sensor ground.

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

Oxygen Sensor Shop ↗ O2 Sensor Socket Shop ↗

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Related Diagnostic Codes

Other codes that may appear with P0139

P0137 Sequential Code

Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 2

Medium
P0138 Sequential Code

Oxygen Sensor Circuit High Voltage Bank 1 Sensor 2

Medium
P0140 Sequential Code

Oxygen Sensor Circuit No Activity Bank 1 Sensor 2

Medium
P0141 Sequential Code

Oxygen Sensor Heater Circuit Malfunction Bank 1 Sensor 2

Medium

💡 Why These Codes Are Related:

  • • Similar Issues: Same root cause or component failure
  • • Related Problems: Often occur together due to system interactions
  • • Sequential Codes: Progressive failure stages or multiple sensors
  • • Same System: Components within the same automotive system