P014B 2016 GMC Sierra Code - HO2S Delayed Response Lean to Rich Bank 2 Sensor 2

The P014B code indicates "HO2S Delayed Response Lean to Rich Bank 2 Sensor 2," meaning the downstream oxygen sensor on Bank 2 is responding slower than expected when transitioning from a lean to a rich condition.

Symptoms may include an illuminated Check Engine Light, decreased fuel efficiency, poor engine performance, and difficulty passing emissions tests.

Common causes include a faulty downstream oxygen sensor (Bank 2 Sensor 2), exhaust leaks, wiring or connector issues, or contamination of the sensor from oil or coolant.

Bank 2 Sensor 2 is the oxygen sensor located downstream (after the catalytic converter) on the exhaust system for the bank of cylinders not containing cylinder 1.

While the vehicle may still be drivable, it’s not recommended to ignore the code as it can result in reduced performance, increased emissions, and potential damage to the catalytic converter over time.

Repairs may include replacing the downstream oxygen sensor, fixing any exhaust leaks, repairing damaged wiring or connectors, or addressing any underlying engine or fuel system issues.

Perform diagnostic tests such as checking the sensor's voltage response with a scan tool, inspecting for wiring damage, and testing for exhaust leaks near the sensor.

You’ll need an OBDII scanner, a multimeter, and possibly an oxygen sensor socket or wrench to replace the faulty sensor.

The repair cost can range from $150 to $400, depending on whether you replace the oxygen sensor yourself or have it done by a professional mechanic.

While a dirty air filter is unlikely to directly cause the code, it can contribute to poor engine performance, which may exacerbate issues leading to delayed oxygen sensor response.