P0139 Low Powertrain

O2 Sensor Slow Response (Bank 1 Sensor 2)

Common Causes

Aging downstream O2 sensor
Contaminated sensor
Failing catalytic converter

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Quick Info

Code P0139
System Powertrain
Severity Low

Disclaimer

This information is for diagnostic guidance only. Always verify repairs with a qualified technician before performing safety-critical work.

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