What does code P1491 mean on Acura vehicles?
Insufficient lift detected in the EGR valve.
OBD-II Code Acura
P1491 — Acura — EGR Valve Lift Insufficient Detected
Insufficient lift detected in the EGR valve.
Common symptoms
- Engine knock
- increased emissions.
Possible causes
- Clogged or faulty EGR valve.
Initial recommendation
Clean or replace EGR valve.
Safety notice
This information is for guidance only. Brand-specific codes may vary by model, year, engine, transmission and vehicle configuration. It does not replace a physical inspection or diagnosis by a qualified mechanic. If the vehicle is unsafe to operate, avoid driving it and seek professional inspection.
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