### P0420 Catalytic Converter Issue
– Common Causes:
Exhaust leaks [1]
– Recommended Fixes:
Repair exhaust system https://carautorepair.site/
### P0171 Air-Fuel Ratio Error
– Likely Problems:
Vacuum leaks
– Diagnostic Steps:
Inspect injectors [1][7]
—
## Car Maintenance Terms
### ABS (Anti-Lock Brake System)
– Function: Enables safe braking [7]
### Vehicle Computer System
– Role: Monitors sensors [7]
### Powertrain Elements
– Contains: Drive axles [7]
—
## Service Procedure Stages
1. **Symptom Assessment**:
Perform visual inspection
2. **Component Testing**:
Measure resistance
3. **Defective Unit Swap**:
Follow torque specs
4. **Final Quality Check**:
Confirm warning light reset
—
## Critical Instruments
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Code Reader | BlueDriver | Retrieve DTCs |
| Mechanical Tools | Smoke machine | Electrical testing |
—
## Technical Data Resources
### Auto Repair Source
– Capabilities:
TSB access [8]
Technical illustrations
### Mobile Applications
– Vehicle Service App:
ECU pinouts [5]
—
## Cost-Saving Tips
– Preventative service prevents major failures
– Master code scanning to prevent mechanic overselling
– Install quality alternatives when OEM prices prohibitive [7]
