### P0420 Catalytic Converter Issue
– Typical Sources:
Faulty oxygen sensor [1]
– Suggested Repairs:
Repair exhaust system https://carautorepair.site/
### P0171 System Too Lean
– Potential Issues:
Vacuum leaks
– Testing Procedure:
Inspect injectors [1][7]
—
## Auto Repair Terminology
### Skid Prevention Technology
– Purpose: Maintains steering control [7]
### ECM/ECU (Engine Control Module)
– Role: Monitors sensors [7]
### Drivetrain Components
– Contains: Drive axles [7]
—
## Service Procedure Stages
1. **Problem Identification**:
Scan DTCs
2. **Part Evaluation**:
Test continuity
3. **Parts Replacement**:
Use OEM parts
4. **Post-Repair Verification**:
Confirm warning light reset
—
## Essential Tools
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Code Reader | Innova | Retrieve DTCs |
| Hand Instruments | Torque wrench | Component repair |
—
## Repair Documentation Sources
### Vehicle Service Database
– Capabilities:
Component locations [8]
Technical illustrations
### Mobile Applications
– Auto Repair Documents:
ECU pinouts [5]
—
## Cost-Saving Tips
– Preventative service prevents major failures
– Understand DTC meanings to avoid unnecessary repairs
– Use aftermarket parts when OEM prices prohibitive [7]
