P1491 Subaru Code - PCV Function Problem
Quick Answer
P1491 Subaru indicates PCV Function Problem. Common causes include Check blow-by hose for damage, PCV diagnostic connector open or shorted. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
- What it means
- P1491 Subaru indicates PCV Function Problem.
- Common causes
- Common causes include Check blow-by hose for damage, PCV diagnostic connector open or shorted.
- Severity
- Moderate - service should be scheduled soon.
- Can I drive?
- The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
Code P1491 Subaru Description
What are the Possible Causes of the DTC P1491 Subaru?
- Check blow-by hose for damage
- PCV diagnostic connector open or shorted
How to Fix the DTC P1491 Subaru?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1491 Subaru code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P1491 Subaru Code
1. What does the OBDII code P1491 mean on a Subaru?
P1491 indicates a "PCV Function Problem," meaning there may be an issue with the Positive Crankcase Ventilation (PCV) system in the engine.
2. What are the symptoms of a P1491 code on a Subaru?
Common symptoms include poor engine performance, reduced fuel efficiency, rough idling, increased emissions, or the Check Engine Light illuminating.
3. What causes the P1491 code on a Subaru?
Causes can include a clogged or stuck PCV valve, a vacuum leak in the PCV system, damaged hoses, or buildup of sludge in the engine.
4. Can I drive my Subaru with a P1491 code?
It’s not recommended to drive for an extended period with a P1491 code, as unresolved PCV system issues can lead to engine damage or increased emissions.
5. How do I fix the P1491 code on my Subaru?
Start by inspecting and replacing the PCV valve if necessary. Check for cracked or damaged PCV hoses and clean any sludge buildup in the system.
6. How can I test the PCV valve on my Subaru?
Remove the PCV valve and shake it. If you don’t hear a rattling noise or if it feels stuck, it may need cleaning or replacement.
7. What tools do I need to fix a P1491 code on a Subaru?
Basic tools like a wrench or socket set, a vacuum gauge for testing, and possibly replacement parts such as a new PCV valve or hoses.
8. How much does it cost to fix a P1491 code on a Subaru?
The cost typically ranges from $10 to $50 for a PCV valve replacement, but labor costs can increase the total if done by a mechanic.
9. Can a dirty air filter cause the P1491 code?
A dirty air filter is unlikely to directly cause the code, but it can contribute to poor engine ventilation, which may worsen PCV system issues.
10. Does clearing the P1491 code fix the problem?
Clearing the code doesn’t fix the underlying issue. You must address the root cause, such as replacing the PCV valve or repairing damaged hoses, to resolve it permanently.
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