### P0420 Catalytic Converter Issue
– Frequent Reasons:
Exhaust leaks [1]
– Recommended Fixes:
Repair exhaust system https://carautorepair.site/
### P0171 Air-Fuel Ratio Error
– Likely Problems:
Fuel delivery problems
– Diagnostic Steps:
Check fuel pressure [1][7]
—
## Vehicle Service Vocabulary
### Electronic Braking System
– Purpose: Prevents wheel lockup [7]
### ECM/ECU (Engine Control Module)
– Role: Manages fuel injection [7]
### Powertrain Elements
– Includes: Drive axles [7]
—
## Service Procedure Stages
1. **Initial Diagnosis**:
Perform visual inspection
2. **Part Evaluation**:
Measure resistance
3. **Defective Unit Swap**:
Follow torque specs
4. **Final Quality Check**:
Test drive vehicle
—
## Critical Instruments
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Code Reader | Innova | Live data streaming |
| Physical Equipment | Smoke machine | Component repair |
—
## Service Information References
### Vehicle Service Database
– Capabilities:
Wiring diagrams [8]
Factory repair procedures
### Mobile Applications
– Auto Repair Documents:
ECU pinouts [5]
—
## Budget Repair Strategies
– Routine checkups prevents major failures
– Master code scanning to avoid unnecessary repairs
– Use aftermarket parts when OEM prices prohibitive [7]
