### P0420 Emissions Control Malfunction
– Frequent Reasons:
Worn catalytic converter [1]
– Suggested Repairs:
Repair exhaust system https://carautorepair.site/
### P0171 Air-Fuel Ratio Error
– Possible Defects:
Vacuum leaks
– Testing Procedure:
Smoke test intake [1][7]
—
## Car Maintenance Terms
### Skid Prevention Technology
– Function: Enables safe braking [7]
### Engine Management Unit
– Responsibility: Monitors sensors [7]
### Drivetrain Components
– Includes: Transmission [7]
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## Repair Process Steps
1. **Problem Identification**:
Conduct road test
2. **System Verification**:
Measure resistance
3. **Parts Replacement**:
Clear error codes
4. **Post-Repair Verification**:
Ensure proper operation
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## Necessary Equipment
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| OBD-II Tool | BlueDriver | Retrieve DTCs |
| Physical Equipment | Multimeter | Electrical testing |
—
## Service Information References
### Mechanical Information System
– Capabilities:
Component locations [8]
OEM specifications
### Smartphone Tools
– Auto Repair Documents:
ECU pinouts [5]
—
## Affordable Maintenance Advice
– Routine checkups avoids costly repairs
– Learn basic diagnostics to prevent mechanic overselling
– Use aftermarket parts when budget constrained [7]