### P0420 Emissions Control Malfunction
– Typical Sources:
Exhaust leaks [1]
– Suggested Repairs:
Replace catalytic converter https://carautorepair.site/
### P0171 Air-Fuel Ratio Error
– Possible Defects:
Faulty MAF sensor
– Troubleshooting Process:
Smoke test intake [1][7]
—
## Vehicle Service Vocabulary
### Skid Prevention Technology
– Function: Enables safe braking [7]
### Vehicle Computer System
– Role: Monitors sensors [7]
### Powertrain Elements
– Includes: Differential [7]
—
## Service Procedure Stages
1. **Initial Diagnosis**:
Conduct road test
2. **System Verification**:
Measure resistance
3. **Parts Replacement**:
Clear error codes
4. **System Validation**:
Test drive vehicle
—
## Necessary Equipment
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Code Reader | Autel | Live data streaming |
| Physical Equipment | Torque wrench | Component repair |
—
## Technical Data Resources
### Vehicle Service Database
– Features:
Component locations [8]
OEM specifications
### Mobile Applications
– Auto Repair Documents:
Component testing guides [5]
—
## Cost-Saving Tips
– Routine checkups prevents major failures
– Master code scanning to prevent mechanic overselling
– Install quality alternatives when OEM prices prohibitive [7]
