OBD2 Code P0418: Auxiliary Emissions (EGR, EVAP, Catalyst)
Emissions control system fault.
Detected Root Component
EGR Valve
Technical Component Diagrams
EGR Valve Layout
Diag Expert technical diagram
EGR Valve Connector
Diag Expert technical diagram
Observed Symptoms
- Engine light on (MIL/Check Engine)
- Emissions exceeding standards
- Excessive fuel consumption
- Strong exhaust smell
Possible Causes
- Clogged EGR valve
- EGR channel clogged
- Failed catalyst
- Vacuum leak
- Faulty solenoid valve
Tools Required
Interactive Diagnostic
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Parts likely to be the cause (Moteur (général))
Moteur (général)
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Frequently asked questions about code P0418
What does code P0418 mean? ▾
OBD2 Code P0418: Auxiliary Emissions (EGR, EVAP, Catalyst). Emissions control system fault.
What are the symptoms of code P0418? ▾
Code P0418 may cause: Engine light on (MIL/Check Engine), Emissions exceeding standards, Excessive fuel consumption, Strong exhaust smell. The intensity of these symptoms varies depending on the vehicle and driving conditions.
What causes code P0418? ▾
The most common causes of code P0418 are: Clogged EGR valve, EGR channel clogged, Failed catalyst, Vacuum leak. A proper OBD2 diagnostic will pinpoint the exact cause.
Is it serious to drive with code P0418? ▾
Code P0418 has moderate severity (Warning). Short-term driving remains possible, but a prompt check is recommended to prevent worsening.
How do I fix code P0418? ▾
Start by reading the code with an OBD2 scanner, then follow the interactive decision tree on this page. Priority causes to check: Clogged EGR valve, EGR channel clogged, Failed catalyst, Vacuum leak. Difficulty: Medium · Estimated time: 30-60min.