### P0420 Catalyst System Efficiency Below Threshold
– Typical Sources:
Worn catalytic converter [1]
– Suggested Repairs:
Replace catalytic converter https://carautorepair.site/
### P0171 System Too Lean
– Likely Problems:
Vacuum leaks
– Troubleshooting Process:
Check fuel pressure [1][7]
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## Auto Repair Terminology
### Electronic Braking System
– Function: Maintains steering control [7]
### ECM/ECU (Engine Control Module)
– Role: Manages fuel injection [7]
### Powertrain Elements
– Contains: Drive axles [7]
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## Mechanical Fixing Workflow
1. **Problem Identification**:
Scan DTCs
2. **Component Testing**:
Check voltage
3. **Parts Replacement**:
Clear error codes
4. **System Validation**:
Ensure proper operation
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## Necessary Equipment
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| OBD-II Tool | Innova | Live data streaming |
| Physical Equipment | Multimeter | Electrical testing |
—
## Service Information References
### Mechanical Information System
– Capabilities:
Component locations [8]
Technical illustrations
### Smartphone Tools
– Vehicle Service App:
Electrical diagrams [5]
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## Affordable Maintenance Advice
– Routine checkups prevents major failures
– Understand DTC meanings to prevent mechanic overselling
– Select certified components when OEM prices prohibitive [7]
