### P0420 Catalytic Converter Issue
– Typical Sources:
Worn catalytic converter [1]
– Common Solutions:
Diagnose fuel trim https://carautorepair.site/
### P0171 Air-Fuel Ratio Error
– Likely Problems:
Fuel delivery problems
– Testing Procedure:
Smoke test intake [1][7]
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## Vehicle Service Vocabulary
### Electronic Braking System
– Purpose: Prevents wheel lockup [7]
### ECM/ECU (Engine Control Module)
– Role: Manages fuel injection [7]
### Drivetrain Components
– Contains: Differential [7]
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## Service Procedure Stages
1. **Problem Identification**:
Conduct road test
2. **System Verification**:
Test continuity
3. **Defective Unit Swap**:
Clear error codes
4. **Final Quality Check**:
Test drive vehicle
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## Critical Instruments
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Diagnostic Scanner | BlueDriver | Retrieve DTCs |
| Hand Instruments | Smoke machine | Electrical testing |
—
## Service Information References
### Vehicle Service Database
– Features:
Component locations [8]
Factory repair procedures
### Mobile Applications
– Vehicle Service App:
ECU pinouts [5]
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## Cost-Saving Tips
– Preventative service avoids costly repairs
– Master code scanning to avoid unnecessary repairs
– Select certified components when budget constrained [7]