What Does P2448 Mean?
The PCM has detected excessive airflow from the secondary air injection system on Bank 1. This indicates a mechanical failure or blockage causing uncontrolled air flow into the exhaust.
Common Causes
40%
Stuck open secondary air injection valve
25%
Damaged or disconnected air injection hoses
20%
Failed air flow sensor in injection system
10%
Exhaust leak near air injection ports
5%
Faulty oxygen sensors reading false lean condition
Diagnostic Steps
1
Step 1: Visually inspect all secondary air injection hoses and connections for damage
2
Step 2: Monitor oxygen sensor data during secondary air pump operation for excessive lean readings
3
Step 3: Check secondary air injection valve operation using scan tool commands
4
Step 4: Listen for air leaks at check valves and injection points
5
Step 5: Test backpressure at air pump to verify restricted flow path
Estimated Repair Cost
$150 - $700
Parts + labor, varies by vehicle and location
The PCM has detected excessive airflow from the secondary air injection system on Bank 1. This indicates a mechanical failure or blockage causing uncontrolled air flow into the exhaust.
The most common cause of P2448 (Secondary Air Injection System High Air Flow Bank 1) is: Stuck open secondary air injection valve
Typical repair costs for P2448 range from $150 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but may cause rough idle, poor fuel economy, and potential catalytic converter damage from excessive oxygen exposure.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2448 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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