### P0420 Catalytic Converter Issue
– Common Causes:
Faulty oxygen sensor [1]
– Common Solutions:
Repair exhaust system https://carautorepair.site/
### P0171 Air-Fuel Ratio Error
– Potential Issues:
Fuel delivery problems
– Troubleshooting Process:
Inspect injectors [1][7]
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## Auto Repair Terminology
### Skid Prevention Technology
– Purpose: Enables safe braking [7]
### Engine Management Unit
– Responsibility: Monitors sensors [7]
### Powertrain Elements
– Includes: Drive axles [7]
—
## Mechanical Fixing Workflow
1. **Problem Identification**:
Scan DTCs
2. **Component Testing**:
Measure resistance
3. **Defective Unit Swap**:
Use OEM parts
4. **Post-Repair Verification**:
Ensure proper operation
—
## Critical Instruments
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Code Reader | BlueDriver | Live data streaming |
| Physical Equipment | Torque wrench | Electrical testing |
—
## Technical Data Resources
### Vehicle Service Database
– Features:
Component locations [8]
OEM specifications
### Digital Assistants
– Vehicle Service App:
Electrical diagrams [5]
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## Cost-Saving Tips
– Preventative service extends vehicle life
– Understand DTC meanings to avoid unnecessary repairs
– Install quality alternatives when budget constrained [7]
