What Does P1424 Mean?
The PCM has detected a leak in the Secondary Air Injection system on Bank 1. Air is escaping before reaching the exhaust ports, reducing system effectiveness.
Common Causes
35%
Cracked or deteriorated SAI hoses and connection tubes
25%
Failed SAI check valve diaphragm or seat allowing backflow
20%
Loose clamps or disconnected fittings in SAI system
15%
Damaged SAI valve gasket or mounting seal
5%
Cracked SAI pump housing or outlet manifold
Diagnostic Steps
1
Step 1: Perform visual inspection of entire SAI system including all hoses, clamps, and connections for obvious damage or loose fittings
2
Step 2: With engine running and SAI system activated, listen for hissing sounds indicating air leaks
3
Step 3: Use automotive smoke machine to pressurize SAI system and identify leak location
4
Step 4: Inspect check valve for cracks or damage - test by removing and blowing through in both directions
5
Step 5: Check all mounting gaskets and seals at SAI valve and injection tube connections for deterioration
Estimated Repair Cost
$100 - $600
Parts + labor, varies by vehicle and location
The PCM has detected a leak in the Secondary Air Injection system on Bank 1. Air is escaping before reaching the exhaust ports, reducing system effectiveness.
The most common cause of P1424 (Secondary Air Injection System Bank 1 Leak Detected) is: Cracked or deteriorated SAI hoses and connection tubes
Typical repair costs for P1424 range from $100 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive normally. This is an emissions-only issue that may cause increased cold-start emissions and will not affect vehicle safety or performance.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1424 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control - Secondary Air Injection
Difficulty
Type
Manufacturer
Recommended Tools
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