### P0420 Emissions Control Malfunction
– Common Causes:
Exhaust leaks [1]
– Recommended Fixes:
Repair exhaust system https://carautorepair.site/
### P0171 Fuel Mixture Imbalance
– Potential Issues:
Faulty MAF sensor
– Testing Procedure:
Check fuel pressure [1][7]
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## Auto Repair Terminology
### ABS (Anti-Lock Brake System)
– Purpose: Prevents wheel lockup [7]
### Engine Management Unit
– Role: Manages fuel injection [7]
### Drivetrain Components
– Contains: Differential [7]
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## Service Procedure Stages
1. **Initial Diagnosis**:
Conduct road test
2. **Component Testing**:
Check voltage
3. **Parts Replacement**:
Use OEM parts
4. **Post-Repair Verification**:
Test drive vehicle
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## Critical Instruments
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Code Reader | BlueDriver | Live data streaming |
| Mechanical Tools | Torque wrench | Component repair |
—
## Service Information References
### Auto Repair Source
– Features:
Wiring diagrams [8]
OEM specifications
### Smartphone Tools
– Auto Repair Documents:
ECU pinouts [5]
—
## Budget Repair Strategies
– Preventative service avoids costly repairs
– Understand DTC meanings to prevent mechanic overselling
– Use aftermarket parts when OEM prices prohibitive [7]
