### P0420 Emissions Control Malfunction
– Frequent Reasons:
Exhaust leaks [1]
– Recommended Fixes:
Replace catalytic converter https://carautorepair.site/
### P0171 Air-Fuel Ratio Error
– Possible Defects:
Vacuum leaks
– Testing Procedure:
Check fuel pressure [1][7]
—
## Car Maintenance Terms
### Electronic Braking System
– Function: Enables safe braking [7]
### Engine Management Unit
– Responsibility: Controls ignition timing [7]
### Powertrain Elements
– Includes: Transmission [7]
—
## Service Procedure Stages
1. **Problem Identification**:
Perform visual inspection
2. **System Verification**:
Check voltage
3. **Component Installation**:
Follow torque specs
4. **System Validation**:
Test drive vehicle
—
## Critical Instruments
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Diagnostic Scanner | BlueDriver | Live data streaming |
| Hand Instruments | Torque wrench | Component repair |
—
## Technical Data Resources
### Auto Repair Source
– Capabilities:
TSB access [8]
OEM specifications
### Smartphone Tools
– Vehicle Service App:
ECU pinouts [5]
—
## Cost-Saving Tips
– Regular maintenance extends vehicle life
– Understand DTC meanings to avoid unnecessary repairs
– Use aftermarket parts when OEM prices prohibitive [7]
