### P0420 Catalytic Converter Issue
– Frequent Reasons:
Faulty oxygen sensor [1]
– Recommended Fixes:
Diagnose fuel trim https://carautorepair.site/
### P0171 Fuel Mixture Imbalance
– Likely Problems:
Vacuum leaks
– Diagnostic Steps:
Check fuel pressure [1][7]
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## Auto Repair Terminology
### ABS (Anti-Lock Brake System)
– Purpose: Maintains steering control [7]
### ECM/ECU (Engine Control Module)
– Role: Monitors sensors [7]
### Transmission System Parts
– Contains: Drive axles [7]
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## Service Procedure Stages
1. **Initial Diagnosis**:
Conduct road test
2. **Part Evaluation**:
Check voltage
3. **Parts Replacement**:
Follow torque specs
4. **Post-Repair Verification**:
Confirm warning light reset
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## Critical Instruments
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| OBD-II Tool | Autel | Retrieve DTCs |
| Hand Instruments | Smoke machine | Electrical testing |
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## Service Information References
### Mechanical Information System
– Capabilities:
TSB access [8]
Factory repair procedures
### Mobile Applications
– Vehicle Service App:
Electrical diagrams [5]
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## Affordable Maintenance Advice
– Regular maintenance prevents major failures
– Understand DTC meanings to avoid unnecessary repairs
– Use aftermarket parts when budget constrained [7]
