What Is Car Fault Code P0413? Diagnose & Clear It with iCarsoft CR Pro S

If your check engine light illuminates and your diagnostic tool retrieves P0413, you’re facing an issue with your vehicle’s Secondary Air Injection (SAI) system—specifically a malfunction in the SAI pump relay control circuit. The SAI system injects fresh air into the exhaust manifold to reduce emissions by aiding catalytic converter warm-up. Ignoring P0413 can lead to failed emissions tests, reduced converter efficiency, or increased exhaust pollutants. In this guide, we’ll break down what P0413 means, why it occurs, and how the iCarsoft CR Pro S—your all-in-one diagnostic solution—can help you resolve it efficiently.

iCarsoft CR Pro S diagnosing P0413 Secondary Air Injection System Relay A Control Circuit Malfunction iCarsoft CR Pro S testing SAI circuit & injection system to diagnose P0413 fault code

What Exactly Is Fault Code P0413?

P0413 is a generic OBD-II trouble code defined as “Secondary Air Injection System Relay A Control Circuit Malfunction”. The SAI pump relay acts as a switch, controlling power delivery to the SAI pump based on signals from the ECU (Engine Control Unit). When the ECU detects an invalid, intermittent, or no signal from the relay’s control circuit, it triggers P0413, indicating a communication failure or component malfunction.

This code applies to gasoline vehicles equipped with SAI systems. Left unaddressed, it may cause the catalytic converter to take longer to reach operating temperature, compromising emissions compliance and long-term converter health.

Why Does P0413 Happen? Common Causes

P0413 typically stems from issues with the SAI pump relay, its control circuit, or related components:

  • Faulty SAI Pump Relay: Internal electrical failure prevents the relay from switching power to the SAI pump.
  • Wiring/Connector Issues: Damaged, frayed, or shorted wires, or a loose/corroded connector between the relay, SAI pump, and ECU.
  • Blown Fuse: A blown fuse in the SAI system disrupts power flow to the relay or pump.
  • Faulty SAI Pump: A seized or defective pump draws excessive current, triggering relay circuit errors.
  • Malfunctioning SAI Control Module: The module regulating relay operation sends incorrect signals to the ECU.
  • ECU Malfunction: Rarely, the engine control unit fails to interpret the relay’s signal correctly.

Why the iCarsoft CR Pro S Is Ideal for P0413

When it comes to diagnosing and fixing P0413, the iCarsoft CR Pro S outperforms basic scanners by offering deep SAI system insights and global compatibility. Here’s why it’s your best tool:

Full SAI System Scans

Unlike basic scanners that only read the code, the CR Pro S dives into the SAI pump relay control circuit, checking the relay, pump, wiring, and fuses.

Live Data Monitoring

View real-time SAI relay circuit voltage and pump activation status to verify abnormal signals.

Bi-directional Control

Test the SAI pump relay and pump by sending commands—confirm if components activate as intended without disassembly.

Global Vehicle Support

Works with over 60 makes (Ford, Toyota, BMW, Mercedes-Benz, VW, etc.)—P0413 is no match for its wide compatibility with SAI-equipped gasoline vehicles.

One-Click Code Clear

After fixing the issue, erase P0413 and turn off the check engine light in seconds.

Lifetime Free Updates

Stay compatible with new SAI system designs and code definitions.

Feedback Function

Get customized repair suggestions from certified professionals tailored to your car’s make and model.

How to Diagnose & Fix P0413 with the CR Pro S (Step-by-Step)

  1. 1. Connect the CR Pro S

    Plug the tool into your car’s OBD-II port (under the dashboard) and turn on the ignition.

  2. 2. AutoVIN Identify

    The tool automatically detects your vehicle’s details—no manual entry needed.

  3. 3. Scan for Codes

    Select “Full System Scan” or “Engine System Scan” to retrieve P0413 and related codes (e.g., P0410 for SAI system malfunction, P0411 for SAI flow malfunction).

  4. 4. Check Live Data

    Monitor SAI relay circuit voltage and pump activation—no voltage or unresponsive activation confirms a circuit or component problem.

  5. 5. Test Components

    Use bi-directional control to activate the SAI pump relay—if the pump doesn’t run, the relay/wiring is faulty; if the relay activates but the pump fails, the pump is defective.

  6. 6. Fix the Root Cause

    Replace the SAI pump relay/pump, repair wiring, replace blown fuses, or service the control module (based on your findings).

  7. 7. Clear the Code

    Use the “Erase Codes” function to reset P0413 and the check engine light.

  8. 8. Re-Scan & Verify

    Run a follow-up scan after driving to ensure the code doesn’t return—confirm the SAI system is working properly.

FAQs About P0413 & the iCarsoft CR Pro S

Q: Can I drive with P0413?
A: You can drive short distances, but failed emissions tests are likely. Diagnose promptly with the CR Pro S to avoid compliance issues and catalytic converter damage.
Q: Will the CR Pro S work with my car to diagnose P0413?
A: Yes! The CR Pro S supports over 60 global makes and all 1996+ OBD-II compliant gasoline vehicles with Secondary Air Injection systems.
Q: Do I need mechanical experience to use the CR Pro S for P0413?
A: No! The tool’s 5-inch touchscreen, AutoVIN function, and clear instructions make it user-friendly for beginners. It highlights SAI components for easy reference.
Q: Can the CR Pro S distinguish between a faulty SAI relay and pump?
A: Absolutely. Bi-directional control tests relay activation—no pump response with a working relay points to a faulty pump; no relay activation indicates a relay or wiring issue.
Q: After fixing P0413, will the CR Pro S clear the code permanently?
A: Yes—once the root cause (e.g., faulty relay, defective pump) is addressed, the “Erase Codes” function clears P0413 permanently. If it returns, the issue wasn’t fully resolved.
Q: Is the CR Pro S better than a basic scanner for P0413?
A: Basic scanners only show P0413—they can’t test the SAI relay or monitor live circuit data. The CR Pro S identifies why the circuit fails, saving you from unnecessary part replacements.
Q: Does the CR Pro S support hybrid vehicles with P0413?
A: Yes! Hybrids with gasoline engines and SAI systems are compatible, and the CR Pro S includes specialized hybrid diagnostic functions to handle P0413.
Q: How often should I update the CR Pro S for P0413 diagnostics?
A: The CR Pro S offers lifetime free Wi-Fi updates—update every 3–6 months to ensure compatibility with new SAI technologies and code definitions.

Final Thoughts: Don’t Let P0413 Compromise Emissions Compliance

Fault code P0413 is critical for meeting emissions standards and protecting your catalytic converter. With the iCarsoft CR Pro S, you can diagnose and fix it from your garage—no expensive dealership visits required. Its deep SAI system coverage, live data monitoring, and bi-directional control take the guesswork out of repairs, whether you’re a DIY enthusiast or professional mechanic.

Invest in the iCarsoft CR Pro S today to tackle P0413 and hundreds of other engine-related codes—keep your car running cleanly and compliant.