### P0420 Catalytic Converter Issue
– Frequent Reasons:
Faulty oxygen sensor [1]
– Recommended Fixes:
Replace catalytic converter https://carautorepair.site/
### P0171 Fuel Mixture Imbalance
– Possible Defects:
Vacuum leaks
– Troubleshooting Process:
Check fuel pressure [1][7]
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## Auto Repair Terminology
### Skid Prevention Technology
– Function: Enables safe braking [7]
### Engine Management Unit
– Responsibility: Controls ignition timing [7]
### Transmission System Parts
– Contains: Drive axles [7]
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## Service Procedure Stages
1. **Initial Diagnosis**:
Scan DTCs
2. **Component Testing**:
Measure resistance
3. **Parts Replacement**:
Use OEM parts
4. **Final Quality Check**:
Ensure proper operation
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## Necessary Equipment
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Code Reader | Autel | Retrieve DTCs |
| Hand Instruments | Smoke machine | Electrical testing |
—
## Repair Documentation Sources
### Vehicle Service Database
– Capabilities:
Component locations [8]
OEM specifications
### Digital Assistants
– Vehicle Service App:
ECU pinouts [5]
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## Affordable Maintenance Advice
– Routine checkups avoids costly repairs
– Learn basic diagnostics to avoid unnecessary repairs
– Use aftermarket parts when OEM prices prohibitive [7]
