O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
Plain-English meaning
The oxygen sensor heater circuit for the sensor located after the catalytic converter on bank 1 is not functioning properly, causing the sensor to not reach operating temperature as expected.
What to check first
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What not to replace yet
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Stop driving when
It is generally safe to continue driving the vehicle; however, if additional symptoms such as rough running or stalling develop, seek professional inspection promptly.
Related symptoms
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Owner steps
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Likely causes
Faulty oxygen sensor (Bank 1 Sensor 2) (medium)
Blown or damaged heater fuse (medium)
Damaged or corroded wiring/connectors in the heater circuit (medium)
Faulty powertrain control module (PCM) or engine control module (ECM) (medium)
Poor electrical connections or grounding issues (medium)
Shop steps
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Follow-up questions
Has the vehicle recently undergone any repairs or modifications near the oxygen sensor?
Are there any other diagnostic trouble codes present?
Is the check engine light steady or flashing?
Has the vehicle shown any changes in fuel economy or performance?