Subaru P1491: Positive Crankcase Ventilation (Blow-by) Function Problem
Is your scanner showing Subaru P1491?
No worries. We'll show you what it means and how to deal with it.
Subaru P1491: Positive Crankcase Ventilation (Blow-by) Function Problem
OVERVIEWWhat Does The Subaru P1491 Code Mean?
With the engine started, the positive crankcase ventilation diagnosis voltage is High.
What Are The Symptoms Of The Subaru P1491 Code?
Improper idling
What Are The Potential Causes Of The Subaru P1491 Code?
- Cracked or disconnected blow-by hose
- Wiring harness between ECM and PCV hose assembly needs repair
- Wiring harness between PCV hose assembly and ground chassis needs repair
- Poor contact in ECM and PCV hose assembly connector
- PCV hose assembly needs replacement
Recommended Parts
Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:
>>> WORKPRO 582-piece Crimp Terminals, Wire Connectors, Heat Shrink Tube, Electrical Repair Kit
>>> Twippo 372Pcs Waterproof Wire Connectors Kit
>>> Genuine Subaru PCV Hose Kit for Turbo EJ - 11815AB711
Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!
Reference Sources
2008 Impreza WRX Repair Manual for P1491 – Pages 276-277.
