Failed split air control solenoid or vacuum switching valve.; Damaged, disconnected, or cracked vacuum hose in the split air circuit.; Corroded or loose electrical connector at the solenoid or PCM.; Open or shorted wire in the split air 2 circuit harness.; Carbon buildup or mechanical failure inside the air control valve or intake passage.; Faulty PCM driver circuit (rare but possible after other causes are ruled out).

DTC codes / Mazda codes / P1419

P1419 · MazdaSplit Air 2 Circuit

Q: What does code P1419 mean?

Split Air 2 Circuit. P1419 on a Mazda indicates that the powertrain control module (PCM) has detected an electrical fault in the split air 2 circuit, which typically controls a secondary air injection path or a variable intake air control solenoid. The PCM monitors the circuit for expected voltage or current and sets this code when the signal is out of range, indicating an open, short, or component failure.

P1419 on a Mazda indicates that the powertrain control module (PCM) has detected an electrical fault in the split air 2 circuit, which typically controls a secondary air injection path or a variable intake air control solenoid. The PCM monitors the circuit for expected voltage or current and sets this code when the signal is out of range, indicating an open, short, or component failure.

SystemPowertrain

Code typeMazda specific

SeverityMedium

Fix difficultyIntermediate

AreaAuxiliary emission controls

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms.
Rough idle or stumbling during cold starts due to incorrect air injection or intake tuning.
Slightly reduced fuel economy or power delivery under certain load conditions.
In some cases, a noticeable hissing or whistling sound from the engine bay if a hose is disconnected.
Intermittent engine hesitation or surge while accelerating, especially when the engine is cold.

Common causes, most likely first

Failed split air control solenoid or vacuum switching valve.
Damaged, disconnected, or cracked vacuum hose in the split air circuit.
Corroded or loose electrical connector at the solenoid or PCM.
Open or shorted wire in the split air 2 circuit harness.
Carbon buildup or mechanical failure inside the air control valve or intake passage.
Faulty PCM driver circuit (rare but possible after other causes are ruled out).

How to diagnose and fix it

Inspect all vacuum hoses and electrical connectors in the split air circuit for cracks, looseness, or corrosion.
Use a scan tool to command the split air solenoid on and off and listen for a click, verifying actuator operation.
Measure resistance across the solenoid terminals and compare to the manufacturer's specification.
Check for battery voltage and ground at the solenoid connector with the key on, engine off.
Perform a wiggle test on the wiring harness while monitoring the circuit with a multimeter or scan tool to find intermittent faults.
If the solenoid fails electrical tests, replace it and clear the code to see if it returns.
If all components test good, trace the wires back to the PCM and check for continuity and shorts to ground or power.

Split Air Circuit Diagnostic Traps

A common mistake is replacing the split air solenoid without first checking the vacuum supply; a cracked or disconnected hose will cause the same code and is far cheaper to fix.
The split air system often only operates during cold starts, so a fault may not trigger the code until the engine is completely cold, leading to intermittent diagnosis.
Carbon buildup in the air control valve can mimic an electrical failure by restricting movement; always verify mechanical operation before condemning the solenoid.
On some Mazda models, the split air circuit shares a ground with other sensors, so a bad ground elsewhere can set P1419 along with unrelated codes.
A faulty PCM is almost never the cause; focus on wiring and vacuum integrity before considering module replacement.

Can I keep driving with P1419?

You can generally continue driving with P1419, but avoid prolonged idling or heavy acceleration until the fault is repaired, as the engine may run less efficiently and emissions could increase. If the check engine light begins flashing or you notice severe performance loss, stop driving and seek professional diagnosis.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for Mazda vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.