Definition
EGR System Insufficient Flow Detected
Possible Causes
Failed EGR valve or solenoid
Clogged EGR passages
Intake manifold leaks
Faulty oxygen sensor
P0171
Definition
System Too Lean (Bank 1)
Possible Causes
Vacuum leak
Fuel pressure problem
Faulty oxygen sensor
Exhaust leak
Troubleshooting Steps
1. Check for any vacuum leaks.
2. Check for any fuel pressure issues.
3. Test the oxygen sensor.
4. Check for leaks in the exhaust system.
5. Clean the EGR valve and passages.
6. Inspect the intake manifold for leaks.
