### P0420 Catalyst System Efficiency Below Threshold
– Typical Sources:
Exhaust leaks [1]
– Suggested Repairs:
Repair exhaust system https://carautorepair.site/
### P0171 Fuel Mixture Imbalance
– Possible Defects:
Fuel delivery problems
– Diagnostic Steps:
Check fuel pressure [1][7]
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## Auto Repair Terminology
### ABS (Anti-Lock Brake System)
– Purpose: Prevents wheel lockup [7]
### Vehicle Computer System
– Role: Manages fuel injection [7]
### Transmission System Parts
– Includes: Differential [7]
—
## Mechanical Fixing Workflow
1. **Problem Identification**:
Perform visual inspection
2. **System Verification**:
Measure resistance
3. **Parts Replacement**:
Clear error codes
4. **Final Quality Check**:
Ensure proper operation
—
## Essential Tools
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| OBD-II Tool | Autel | Retrieve DTCs |
| Hand Instruments | Smoke machine | Electrical testing |
—
## Technical Data Resources
### Mechanical Information System
– Capabilities:
TSB access [8]
Technical illustrations
### Smartphone Tools
– Vehicle Service App:
Component testing guides [5]
—
## Affordable Maintenance Advice
– Routine checkups extends vehicle life
– Master code scanning to prevent mechanic overselling
– Use aftermarket parts when budget constrained [7]