The P014B: O2 Sensor Delayed Response – Lean to Rich (Bank 2 Sensor 2) indicates that the oxygen sensor on Bank 2, Sensor 2, is not responding quickly enough when the air-fuel mixture changes from lean to rich. This can be caused by a faulty sensor, wiring issues, exhaust leaks, or a malfunctioning PCM.
P014B – Quick Overview
Meaning | P014B: O2 Sensor Delayed Response – Lean to Rich (Bank 2 Sensor 2) |
Is it serious? | Yes, this code can lead to inefficient engine performance and increased emissions if not addressed. |
Possible causes | – Faulty O2 sensor – Wiring issues such as shorts or opens – Exhaust leaks – Faulty PCM |
How to diagnose? | – Inspect the O2 sensor for proper operation. – Check the wiring and connections for continuity. – Test the sensor response using a scan tool. – Repair any exhaust leaks found. – Replace or repair any faulty components. |
P014B Meaning
The P014B: O2 Sensor Delayed Response – Lean to Rich (Bank 2 Sensor 2) code means that the oxygen sensor on the second bank of the engine (after the catalytic converter) is not switching from a lean to rich condition as quickly as expected. This can affect the vehicle’s fuel efficiency and emissions.
Step-by-step diagnostic guide
Follow the outline procedure to diagnose this DTC by eliminating possible causes one by one.
Action | Description | Tools Needed |
---|---|---|
Check for Other Codes | Use an OBD-II scanner to check if there are any other related codes present. These might give additional clues about the problem. | OBD-II Scanner |
Inspect the O2 Sensor | Visually inspect the O2 sensor for any signs of damage or wear. Ensure it is securely connected and free from contaminants. | Flashlight, Safety Gloves |
Test the Sensor Response | Use a scan tool to monitor the O2 sensor’s response time from lean to rich and compare it with the manufacturer’s specifications. | OBD-II Scanner, Scan Tool |
Inspect Wiring and Connections | Carefully check the wiring and connectors leading to the O2 sensor for signs of wear, shorts, opens, or corrosion. | Flashlight, Multimeter |
Check for Exhaust Leaks | Inspect the exhaust system for any leaks that could affect the O2 sensor readings. Pay special attention to the area before the sensor. | Flashlight, Exhaust Leak Detector |
Repair or Replace Faulty Components | Repair any identified issues, such as exhaust leaks, damaged wiring, or a faulty O2 sensor. Ensure all connections are secure and components are functioning correctly. | Replacement O2 Sensor, Wire Strippers, Exhaust Repair Kit |
Clear the Code and Test Drive | After completing the necessary repairs, clear the P014B code using the OBD-II scanner. Take the vehicle for a test drive to ensure the issue is resolved and the code does not return. | OBD-II Scanner, Vehicle Owner’s Manual |
Recheck for Codes | After the test drive, re-scan the vehicle to ensure the P014B code has not reappeared. If the code returns, further diagnosis may be required. | OBD-II Scanner |

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Hi, I am Juraj “Yuri” Lukacko. I got frustrated by unhelpful and scammy mechanics, so I decided to learn everything about car diagnostics myself. I test dozens of new car diagnostic tools every month along with learning new strategies to fix and customize cars. About Juraj Lukacko (Yuri)