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What does p0139 mean in my 1997 Cadillac ElDorado?

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What does p0139 mean in my 1997 Cadillac ElDorado?

Vehicle: 1997 Cadillac ElDorado

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Hi there,

The code is for a faulty O2 sensor, bank 1 sensor 2. This is the O2 sensor mounted in the exhaust AFTER the converter on bank 1. Bank 1 is the bank closest to the firewall on this engine.
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P0139 CADILLAC - HO2S Slow Response Bank 1 Sensor 2

Read more: https://www.autocodes.com/p0139_cadillac.html

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