### P0420 Catalytic Converter Issue
– Common Causes:
Exhaust leaks [1]
– Recommended Fixes:
Diagnose fuel trim https://carautorepair.site/
### P0171 System Too Lean
– Likely Problems:
Vacuum leaks
– Diagnostic Steps:
Check fuel pressure [1][7]
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## Auto Repair Terminology
### Skid Prevention Technology
– Purpose: Maintains steering control [7]
### ECM/ECU (Engine Control Module)
– Responsibility: Manages fuel injection [7]
### Powertrain Elements
– Contains: Drive axles [7]
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## Service Procedure Stages
1. **Symptom Assessment**:
Perform visual inspection
2. **Part Evaluation**:
Check voltage
3. **Parts Replacement**:
Clear error codes
4. **Final Quality Check**:
Test drive vehicle
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## Necessary Equipment
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| OBD-II Tool | Autel | Retrieve DTCs |
| Hand Instruments | Smoke machine | Component repair |
—
## Technical Data Resources
### Vehicle Service Database
– Features:
Component locations [8]
Factory repair procedures
### Digital Assistants
– Vehicle Service App:
Electrical diagrams [5]
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## Cost-Saving Tips
– Regular maintenance extends vehicle life
– Learn basic diagnostics to prevent mechanic overselling
– Install quality alternatives when OEM prices prohibitive [7]
