### P0420 Catalytic Converter Issue
– Frequent Reasons:
Exhaust leaks [1]
– Suggested Repairs:
Diagnose fuel trim https://carautorepair.site/
### P0171 Air-Fuel Ratio Error
– Likely Problems:
Vacuum leaks
– Testing Procedure:
Smoke test intake [1][7]
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## Vehicle Service Vocabulary
### Electronic Braking System
– Function: Maintains steering control [7]
### Vehicle Computer System
– Role: Monitors sensors [7]
### Drivetrain Components
– Includes: Drive axles [7]
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## Mechanical Fixing Workflow
1. **Initial Diagnosis**:
Conduct road test
2. **Part Evaluation**:
Measure resistance
3. **Defective Unit Swap**:
Clear error codes
4. **Post-Repair Verification**:
Test drive vehicle
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## Critical Instruments
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Code Reader | Innova | Retrieve DTCs |
| Physical Equipment | Multimeter | Component repair |
—
## Repair Documentation Sources
### Vehicle Service Database
– Features:
Wiring diagrams [8]
Factory repair procedures
### Mobile Applications
– Vehicle Service App:
Electrical diagrams [5]
—
## Affordable Maintenance Advice
– Preventative service extends vehicle life
– Learn basic diagnostics to prevent mechanic overselling
– Use aftermarket parts when budget constrained [7]