### P0420 Catalytic Converter Issue
– Common Causes:
Faulty oxygen sensor [1]
– Common Solutions:
Repair exhaust system https://carautorepair.site/
### P0171 Air-Fuel Ratio Error
– Possible Defects:
Fuel delivery problems
– Diagnostic Steps:
Inspect injectors [1][7]
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## Auto Repair Terminology
### Electronic Braking System
– Purpose: Prevents wheel lockup [7]
### Engine Management Unit
– Responsibility: Controls ignition timing [7]
### Powertrain Elements
– Contains: Drive axles [7]
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## Mechanical Fixing Workflow
1. **Initial Diagnosis**:
Perform visual inspection
2. **Component Testing**:
Check voltage
3. **Parts Replacement**:
Use OEM parts
4. **Post-Repair Verification**:
Ensure proper operation
—
## Critical Instruments
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Code Reader | Autel | Live data streaming |
| Hand Instruments | Torque wrench | Electrical testing |
—
## Repair Documentation Sources
### Auto Repair Source
– Capabilities:
Component locations [8]
OEM specifications
### Smartphone Tools
– Auto Repair Documents:
Electrical diagrams [5]
—
## Budget Repair Strategies
– Preventative service avoids costly repairs
– Understand DTC meanings to prevent mechanic overselling
– Use aftermarket parts when budget constrained [7]
