The P2448: Secondary Air Injection System High Air Flow Bank 1 code indicates an issue where excessive air flow is detected in the secondary air injection system for Bank 1. This can lead to improper functioning of the emissions control system and may be caused by a faulty air flow sensor, blockages, or leaks in the system.
P2448 – Quick Overview
Code | Information |
---|---|
Meaning | P2448: Secondary Air Injection System High Air Flow Bank 1 |
Is it serious? | Moderate – excessive air flow can lead to improper emissions control, resulting in higher emissions and potential engine issues. |
Possible causes | – Excessive air flow in the secondary air injection system Bank 1 – Faulty air flow sensor – Blockages or leaks in the air injection system |
How to diagnose? | – Inspect and test the air flow sensor for Bank 1 – Check for blockages or leaks in the air injection system – Replace faulty sensor if needed |
P2448 Meaning
The P2448: Secondary Air Injection System High Air Flow Bank 1 code means that there is more air flowing through the secondary air injection system in Bank 1 than expected. This could be due to a malfunctioning air flow sensor, leaks allowing excess air into the system, or a blocked component that causes an increase in pressure elsewhere. High airflow can interfere with proper emissions control, leading to increased pollutants and potential engine performance issues.
Step-by-step diagnostic guide
Action | Description | Tools Needed |
---|---|---|
Check for Other Codes | Use an OBD-II scanner to determine if any additional related codes are present. These may help indicate whether other parts of the air injection system are affected. | OBD-II Scanner |
Inspect the Air Flow Sensor | Visually inspect the air flow sensor in the secondary air injection system for Bank 1 for any visible signs of damage, contamination, or improper mounting. | Flashlight, Safety Gloves |
Test the Air Flow Sensor | Use a diagnostic tool to test the output of the air flow sensor. Compare the readings to the manufacturer’s specifications to verify if the sensor is operating within the correct range. | Multimeter, Diagnostic Tool |
Check for Blockages | Inspect the air intake passages and air injection system components for any blockages or restrictions. Clear any debris or carbon buildup that may be present. | Flashlight, Air Compressor, Cleaning Tools |
Check for Leaks | Inspect all connections, hoses, and components for leaks that could be allowing excessive air into the system. A leak in the air system can disrupt the normal balance of air flow. | Smoke Machine or Leak Detector, Flashlight |
Repair or Replace Components | If blockages, leaks, or other issues are found, repair them. If the air flow sensor is found to be faulty, replace it with a new one to restore normal function. | Replacement Sensor, Wrench Set, Cleaning Tools |
Clear the Code and Test Drive | Use an OBD-II scanner to clear the P2448 code after repairs are completed. Take the vehicle for a test drive to verify that the issue has been resolved and that the air injection system functions properly. | OBD-II Scanner, Vehicle Owner’s Manual |
Recheck for Codes | Re-scan the vehicle after the test drive to ensure that the P2448 code has not returned. If it persists, further diagnostics may be required to identify other issues. | OBD-II Scanner |

OBD-II scanner Buyer’s Guide
- Scanner features explained
- Different types of scanners
- Scanners for coding/odometer/ECU/checks
- Best picks + discount codes

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)