### P0420 Catalyst System Efficiency Below Threshold
– Typical Sources:
Worn catalytic converter [1]
– Recommended Fixes:
Replace catalytic converter https://carautorepair.site/
### P0171 Air-Fuel Ratio Error
– Potential Issues:
Fuel delivery problems
– Troubleshooting Process:
Smoke test intake [1][7]
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## Car Maintenance Terms
### ABS (Anti-Lock Brake System)
– Function: Enables safe braking [7]
### ECM/ECU (Engine Control Module)
– Role: Controls ignition timing [7]
### Drivetrain Components
– Contains: Drive axles [7]
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## Mechanical Fixing Workflow
1. **Initial Diagnosis**:
Conduct road test
2. **Part Evaluation**:
Measure resistance
3. **Parts Replacement**:
Follow torque specs
4. **Post-Repair Verification**:
Ensure proper operation
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## Necessary Equipment
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| OBD-II Tool | Innova | Live data streaming |
| Hand Instruments | Multimeter | Component repair |
—
## Technical Data Resources
### Mechanical Information System
– Capabilities:
Component locations [8]
Technical illustrations
### Smartphone Tools
– Vehicle Service App:
Component testing guides [5]
—
## Budget Repair Strategies
– Preventative service avoids costly repairs
– Understand DTC meanings to avoid unnecessary repairs
– Use aftermarket parts when budget constrained [7]
