### P0420 Catalytic Converter Issue
– Typical Sources:
Exhaust leaks [1]
– Common Solutions:
Diagnose fuel trim https://carautorepair.site/
### P0171 System Too Lean
– Potential Issues:
Fuel delivery problems
– Testing Procedure:
Smoke test intake [1][7]
—
## Car Maintenance Terms
### Skid Prevention Technology
– Purpose: Enables safe braking [7]
### ECM/ECU (Engine Control Module)
– Responsibility: Controls ignition timing [7]
### Powertrain Elements
– Includes: Transmission [7]
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## Mechanical Fixing Workflow
1. **Initial Diagnosis**:
Perform visual inspection
2. **Component Testing**:
Measure resistance
3. **Defective Unit Swap**:
Use OEM parts
4. **System Validation**:
Confirm warning light reset
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## Essential Tools
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Code Reader | Innova | Retrieve DTCs |
| Hand Instruments | Torque wrench | Electrical testing |
—
## Service Information References
### Mechanical Information System
– Capabilities:
Wiring diagrams [8]
OEM specifications
### Smartphone Tools
– Vehicle Service App:
Component testing guides [5]
—
## Cost-Saving Tips
– Routine checkups avoids costly repairs
– Understand DTC meanings to avoid unnecessary repairs
– Use aftermarket parts when OEM prices prohibitive [7]
