### P0420 Catalyst System Efficiency Below Threshold
– Typical Sources:
Worn catalytic converter [1]
– Common Solutions:
Repair exhaust system https://carautorepair.site/
### P0171 Air-Fuel Ratio Error
– Possible Defects:
Faulty MAF sensor
– Diagnostic Steps:
Inspect injectors [1][7]
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## Vehicle Service Vocabulary
### ABS (Anti-Lock Brake System)
– Function: Prevents wheel lockup [7]
### Vehicle Computer System
– Role: Controls ignition timing [7]
### Drivetrain Components
– Contains: Drive axles [7]
—
## Mechanical Fixing Workflow
1. **Problem Identification**:
Perform visual inspection
2. **Part Evaluation**:
Test continuity
3. **Defective Unit Swap**:
Follow torque specs
4. **Post-Repair Verification**:
Test drive vehicle
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## Necessary Equipment
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Diagnostic Scanner | BlueDriver | Retrieve DTCs |
| Physical Equipment | Torque wrench | Component repair |
—
## Technical Data Resources
### Vehicle Service Database
– Capabilities:
TSB access [8]
Technical illustrations
### Mobile Applications
– Auto Repair Documents:
ECU pinouts [5]
—
## Cost-Saving Tips
– Regular maintenance prevents major failures
– Learn basic diagnostics to prevent mechanic overselling
– Use aftermarket parts when budget constrained [7]
