Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 136 (ENGINE CONTROL SYSTEM SELF DIAGNOSTICS - 4-CYLINDER)DIAGNOSTIC TESTSDTC P0402: EXCESSIVE EXHAUST GAS RECIRCULATION FLOW DETECTEDPOSSIBLE CAUSES
2004 Toyota Matrix XR, FWD, Standard
Possible Causes
2004 Toyota Matrix XR, FWD, StandardSECTION Possible Causes
WARNING: This page is about a different car, the 2003 Toyota Tacoma. However, it is still accessible from the selected car via links, so may be relevant.
This DTC uses two-trip detection logic. DTC is set if EGR valve is always open or if EGR gas temperature value is excessive when EGR is off when engine is cold. Possible causes are:
- EGR gas temperature sensor circuit is shorted.
- Defective EGR gas temperature sensor.
- EGR Vacuum Switching Valve (VSV) circuit is open.
- Defective EGR VSV.
- EGR valve is stuck open.
- Defective ECM.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.