### P0420 Catalytic Converter Issue
– Common Causes:
Worn catalytic converter [1]
– Recommended Fixes:
Replace catalytic converter https://carautorepair.site/
### P0171 Air-Fuel Ratio Error
– Likely Problems:
Faulty MAF sensor
– Diagnostic Steps:
Inspect injectors [1][7]
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## Vehicle Service Vocabulary
### Electronic Braking System
– Function: Prevents wheel lockup [7]
### ECM/ECU (Engine Control Module)
– Responsibility: Manages fuel injection [7]
### Transmission System Parts
– Contains: Differential [7]
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## Service Procedure Stages
1. **Symptom Assessment**:
Conduct road test
2. **Part Evaluation**:
Check voltage
3. **Defective Unit Swap**:
Follow torque specs
4. **Post-Repair Verification**:
Confirm warning light reset
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## Essential Tools
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Diagnostic Scanner | Autel | Retrieve DTCs |
| Hand Instruments | Torque wrench | Component repair |
—
## Repair Documentation Sources
### Auto Repair Source
– Capabilities:
TSB access [8]
OEM specifications
### Digital Assistants
– Vehicle Service App:
Component testing guides [5]
—
## Budget Repair Strategies
– Regular maintenance extends vehicle life
– Master code scanning to avoid unnecessary repairs
– Install quality alternatives when OEM prices prohibitive [7]