### P0420 Catalytic Converter Issue
– Common Causes:
Worn catalytic converter [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
### ABS (Anti-Lock Brake System)
– Function: Maintains steering control [7]
### Engine Management Unit
– Role: Controls ignition timing [7]
### Transmission System Parts
– Includes: Differential [7]
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## Service Procedure Stages
1. **Symptom Assessment**:
Conduct road test
2. **System Verification**:
Check voltage
3. **Component Installation**:
Follow torque specs
4. **System Validation**:
Test drive vehicle
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## Necessary Equipment
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Diagnostic Scanner | Autel | Live data streaming |
| Hand Instruments | Torque wrench | Component repair |
—
## Service Information References
### Vehicle Service Database
– Capabilities:
Component locations [8]
Technical illustrations
### Smartphone Tools
– Auto Repair Documents:
ECU pinouts [5]
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## Affordable Maintenance Advice
– Regular maintenance prevents major failures
– Master code scanning to prevent mechanic overselling
– Use aftermarket parts when OEM prices prohibitive [7]
