### P0420 Catalyst System Efficiency Below Threshold
– Common Causes:
Faulty oxygen sensor [1]
– Recommended Fixes:
Repair exhaust system https://carautorepair.site/
### P0171 Fuel Mixture Imbalance
– Possible Defects:
Faulty MAF sensor
– Troubleshooting Process:
Inspect injectors [1][7]
—
## Car Maintenance Terms
### Skid Prevention Technology
– Function: Maintains steering control [7]
### Engine Management Unit
– Role: Manages fuel injection [7]
### Powertrain Elements
– Includes: Transmission [7]
—
## Repair Process Steps
1. **Initial Diagnosis**:
Perform visual inspection
2. **Component Testing**:
Check voltage
3. **Parts Replacement**:
Clear error codes
4. **Final Quality Check**:
Test drive vehicle
—
## Necessary Equipment
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| OBD-II Tool | BlueDriver | Live data streaming |
| Physical Equipment | Multimeter | Electrical testing |
—
## Service Information References
### Auto Repair Source
– Features:
Wiring diagrams [8]
OEM specifications
### Smartphone Tools
– Auto Repair Documents:
Electrical diagrams [5]
—
## Cost-Saving Tips
– Regular maintenance prevents major failures
– Master code scanning to prevent mechanic overselling
– Install quality alternatives when budget constrained [7]