### P0420 Catalytic Converter Issue
– Common Causes:
Worn catalytic converter [1]
– Common Solutions:
Diagnose fuel trim https://carautorepair.site/
### P0171 System Too Lean
– Possible Defects:
Vacuum leaks
– Diagnostic Steps:
Inspect injectors [1][7]
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## Auto Repair Terminology
### ABS (Anti-Lock Brake System)
– Function: Enables safe braking [7]
### ECM/ECU (Engine Control Module)
– Responsibility: Manages fuel injection [7]
### Drivetrain Components
– Includes: Differential [7]
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## Service Procedure Stages
1. **Initial Diagnosis**:
Conduct road test
2. **System Verification**:
Measure resistance
3. **Parts Replacement**:
Follow torque specs
4. **System Validation**:
Confirm warning light reset
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## Essential Tools
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| OBD-II Tool | Autel | Live data streaming |
| Physical Equipment | Smoke machine | Electrical testing |
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## Technical Data Resources
### Vehicle Service Database
– Capabilities:
Wiring diagrams [8]
OEM specifications
### Digital Assistants
– Auto Repair Documents:
Electrical diagrams [5]
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## Affordable Maintenance Advice
– Preventative service prevents major failures
– Understand DTC meanings to prevent mechanic overselling
– Use aftermarket parts when OEM prices prohibitive [7]