P1424: Secondary Air Injection Bank 2 Circuit Fault
The P1424 code indicates a malfunction in the secondary air injection (SAI) system control circuit for engine bank 2. This system injects fresh air into the exhaust manifold during cold starts to accelerate oxidation of hydrocarbons (HC) and carbon monoxide (CO) before the catalytic converter reaches operating temperature. The code specifically points to a fault in the air distribution circuit for bank 2, which can be caused by a defective control valve, actuator, or associated wiring issues. The SAI system is critical for meeting emissions standards during cold-start operation.
01. Most Common Causes
- Damaged or stuck secondary air injection (SAI) control valve on bank 2
- Faulty secondary air bypass valve actuator
- Short circuit or open circuit in the control wiring
- Corroded or loose connector or terminal in the bank 2 circuit
- Blown fuse for the secondary air injection system
- Defective secondary air pump or low pump flow
- Blocked hoses or ducts in the secondary air injection system
- Faulty secondary air injection system relay
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Failed emissions test due to increased cold-start emissions
03. Step-by-Step Diagnosis
Scan for codes and verify P1424 is present, noting any related codes
Inspect the secondary air injection system fuse and relay for bank 2
Check wiring and connectors for damage, corrosion, or loose connections
Test the secondary air control valve and actuator for proper operation
Verify air pump function and check for blockages in hoses or ducts
1. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is generally safe to drive with P1424, but the vehicle may fail an emissions test and the Check Engine Light will be on. The issue should be addressed promptly to avoid potential catalytic converter damage from improper warm-up.
How much does it cost to fix?▼
Repair costs typically range from $200 to $800, depending on the root cause. A simple fuse or relay replacement may be under $100, while replacing a secondary air pump or valve can cost $300–$800 including labor.