LEMON Manuals
: Even more car manuals for everyone: 1960-2025
Home
>>
Acura
>>
2003
>>
3.5RL
>>
Repair and Diagnosis
>>
Engine Performance
>>
System
>>
Engine Performance System Self-Diagnostics
>>
Diagnostic Tests
>>
DTC P0401: Exhaust Gas RECIRCULATION (EGR) Insufficient Flow
>>
Possible Causes
April 5, 2026:
LEMON Manuals is launched!
Read the announcement.
Possible Causes
Insufficient EGR gas flow can be caused by:
A clogged or leaking EGR line.
A faulty EGR valve.