### P0420 Catalyst System Efficiency Below Threshold
– Frequent Reasons:
Exhaust leaks [1]
– Suggested Repairs:
Repair exhaust system https://carautorepair.site/
### P0171 Fuel Mixture Imbalance
– Potential Issues:
Vacuum leaks
– Troubleshooting Process:
Smoke test intake [1][7]
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## Auto Repair Terminology
### ABS (Anti-Lock Brake System)
– Function: Prevents wheel lockup [7]
### ECM/ECU (Engine Control Module)
– Role: Manages fuel injection [7]
### Transmission System Parts
– Contains: Differential [7]
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## Repair Process Steps
1. **Symptom Assessment**:
Scan DTCs
2. **System Verification**:
Measure resistance
3. **Component Installation**:
Use OEM parts
4. **Post-Repair Verification**:
Confirm warning light reset
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## Necessary Equipment
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Diagnostic Scanner | Autel | Retrieve DTCs |
| Mechanical Tools | Multimeter | Electrical testing |
—
## Service Information References
### Auto Repair Source
– Features:
Wiring diagrams [8]
Technical illustrations
### Mobile Applications
– Vehicle Service App:
ECU pinouts [5]
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## Affordable Maintenance Advice
– Regular maintenance prevents major failures
– Master code scanning to prevent mechanic overselling
– Select certified components when budget constrained [7]