What Does P1432 Mean?
The secondary air injection system is operating but the ECM has detected incorrect airflow to the exhaust manifold. This indicates a mechanical problem with air delivery such as blockages, leaks, or failed valves preventing proper air injection.
Common Causes
35%
Failed or stuck secondary air injection check valve(s)
25%
Leaking or disconnected air injection hoses
20%
Failed or stuck secondary air injection bypass/diverter valve
10%
Restricted air injection passages in exhaust manifold
10%
Weak or failing air pump not delivering sufficient flow
Diagnostic Steps
1
Step 1: Start cold engine and verify air pump runs, listen for air being injected into exhaust (should hear hissing)
2
Step 2: Inspect all air injection hoses for cracks, disconnections, or collapsed sections
3
Step 3: Remove check valve(s) and blow through them to verify one-way operation (should flow toward manifold only)
4
Step 4: Check for exhaust leaks at air injection ports which would prevent proper flow detection
5
Step 5: Monitor air pump amperage draw to verify pump is delivering adequate flow (compare to specifications)
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
The secondary air injection system is operating but the ECM has detected incorrect airflow to the exhaust manifold. This indicates a mechanical problem with air delivery such as blockages, leaks, or failed valves preventing proper air injection.
The most common cause of P1432 (Secondary Air Injection System Incorrect Flow Detected) is: Failed or stuck secondary air injection check valve(s)
Typical repair costs for P1432 range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive with no immediate risks. Vehicle will fail emissions testing and catalytic converter efficiency may be reduced over time.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1432 to identify the root cause.
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Quick Info
Category
Powertrain
System
Secondary Air Injection/Emissions
Difficulty
Type
Manufacturer
Recommended Tools
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