### P0420 Emissions Control Malfunction
– Common Causes:
Exhaust leaks [1]
– Suggested Repairs:
Replace catalytic converter https://carautorepair.site/
### P0171 System Too Lean
– Potential Issues:
Faulty MAF sensor
– Testing Procedure:
Smoke test intake [1][7]
—
## Car Maintenance Terms
### Electronic Braking System
– Function: Enables safe braking [7]
### Vehicle Computer System
– Responsibility: Monitors sensors [7]
### Transmission System Parts
– Includes: Differential [7]
—
## Mechanical Fixing Workflow
1. **Initial Diagnosis**:
Scan DTCs
2. **System Verification**:
Measure resistance
3. **Defective Unit Swap**:
Clear error codes
4. **Final Quality Check**:
Ensure proper operation
—
## Critical Instruments
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Diagnostic Scanner | Innova | Live data streaming |
| Hand Instruments | Smoke machine | Component repair |
—
## Repair Documentation Sources
### Mechanical Information System
– Features:
Wiring diagrams [8]
OEM specifications
### Mobile Applications
– Auto Repair Documents:
Electrical diagrams [5]
—
## Budget Repair Strategies
– Regular maintenance prevents major failures
– Learn basic diagnostics to prevent mechanic overselling
– Install quality alternatives when budget constrained [7]
