What Does P1419 Mean?
The PCM has detected an abnormally high voltage signal from the Secondary Air Injection (SAI) system monitoring circuit. This indicates a potential wiring issue or sensor fault in the feedback circuit that monitors SAI system operation.
Common Causes
35%
SAI system pressure/flow sensor circuit shorted to voltage or open circuit
30%
Damaged or corroded wiring harness between SAI sensor and PCM
20%
Faulty SAI control module sending incorrect signal
15%
PCM internal circuit fault or water intrusion
Diagnostic Steps
1
Step 1: Using a multimeter, check the voltage at the SAI monitoring circuit sensor connector with ignition on - should see reference voltage (typically 5V)
2
Step 2: Inspect wiring harness and connectors for damage, corrosion, or signs of short to voltage
3
Step 3: Disconnect SAI sensor and test circuit resistance to ground and voltage - should show high resistance when disconnected
4
Step 4: Monitor live data for SAI system monitor voltage during key-on and SAI pump activation
5
Step 5: If all wiring tests normal, test or replace SAI monitoring sensor, then retest before considering PCM replacement
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
The PCM has detected an abnormally high voltage signal from the Secondary Air Injection (SAI) system monitoring circuit. This indicates a potential wiring issue or sensor fault in the feedback circuit that monitors SAI system operation.
The most common cause of P1419 (SAI System Monitor Circuit High Input) is: SAI system pressure/flow sensor circuit shorted to voltage or open circuit
Typical repair costs for P1419 range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive. This is an emissions-only fault that will not affect drivability but may increase cold-start emissions and prevent passing emissions testing.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1419 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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