Subaru Legacy Camshaft Position Sensor Guide (2011-2017)
Having trouble starting your 2011-2017 Subaru Legacy? It could be a bad camshaft position sensor.
- A failing camshaft sensor on a 2011-2017 Legacy will likely cause a Check Engine Light (P0340/P0345), hard starting, and rough running.
- Before replacing the sensor, be aware of Subaru's TSB #11-130-13R, which points to incorrect sensor clearance as a possible cause for the same symptoms.
- Replacement is a simple DIY task requiring only basic tools, taking less than 30 minutes.
- While budget aftermarket sensors are available, using a genuine Subaru (OEM) part is strongly recommended for long-term reliability.
Is Your Legacy's Engine Acting Up?
If your 2011-2017 Subaru Legacy is having trouble starting, idling roughly, or stalling, a failing camshaft position sensor could be the culprit. This sensor is a common failure point that can cause a range of frustrating engine problems. Understanding the symptoms and your replacement options can help you get your car back on the road quickly.
Known Issue: Technical Service Bulletin (TSB)
Subaru issued a Technical Service Bulletin (TSB #11-130-13R) for some 2013 and newer models, including the Legacy, with FA and FB series engines. The bulletin notes that the clearance between the camshaft position sensor and the camshaft may be incorrect. This can cause a Check Engine Light, rough idle, extended cranking, or a no-start condition. The fix may involve measuring the sensor gap and installing a shim, not just replacing the sensor. 🎬 Watch a professional test and replace a faulty sensor. It's wise to be aware of this issue before replacing the part, as a new sensor may not solve the problem if the gap is the real issue.
Symptoms of a Failing Camshaft Position Sensor
When a camshaft sensor starts to fail, your Legacy's computer gets confusing signals. This can lead to several noticeable problems:
- Check Engine Light: This is often the first sign. You'll likely see codes like P0340 or P0345. 🎬 See how these specific codes relate to your Subaru's sensors.
- Hard Starting or No Start: The engine may crank for a long time before starting, or it may not start at all.
- Rough Idle: The engine may shake or vibrate when you're stopped.
- Engine Stalling: The engine might suddenly shut off while driving or when idling.
- Poor Acceleration: You may notice the car feels sluggish or hesitant when you press the gas pedal.
- Reduced Fuel Economy: When the engine timing is off, it burns more fuel than necessary.
Choosing the Right Aftermarket Part: OEM vs. Aftermarket
When it comes to critical engine sensors, there is a significant debate between using original equipment (OEM) parts and aftermarket alternatives. For Subaru vehicles, many owners and mechanics strongly recommend using genuine OEM sensors.
- OEM Sensors: Made by Subaru's chosen manufacturer, these parts are designed for a perfect fit and reliable performance. They are the most expensive option but have the lowest risk of premature failure. The OEM part number for this sensor is typically 22056AA270.
- Aftermarket Sensors (Replacement Brand): Aftermarket parts from brands like 'Replacement' offer a significant cost saving. While tempting, budget sensors have a reputation for being less reliable and may fail sooner than OEM parts. If the budget is tight, an aftermarket sensor can get your car running, but be aware that you might be replacing it again sooner than you would with an OEM part.
Pro Tip
Given the sensor's critical role and the relatively low labor cost to replace it, investing in an OEM sensor is often the most cost-effective choice in the long run to avoid future headaches and another replacement job.
Estimated Replacement Costs
The cost to replace a camshaft position sensor can vary based on the part you choose and who does the work.
| Part/Service | Estimated Cost |
|---|---|
| New OEM Part | $100 - $145 |
| New Aftermarket Part | $32 - $120 |
| Shop Labor | $50 - $100 |
Frequently Asked Questions
How many camshaft sensors does a 2011-2017 Legacy have?
The 2.5L engine in this generation of Subaru Legacy has two camshaft position sensors, one for each camshaft (Bank 1 and Bank 2). Some models may have four sensors (intake and exhaust for each bank). It is important to diagnose which sensor has failed by reading the specific trouble code.
Where are the camshaft position sensors located?
The sensors are located on the front of the engine, mounted to the timing chain covers. They are typically held in place by a single 10mm bolt, making them relatively easy to access and replace.
Can I replace the sensor myself? 🎬 Watch this step-by-step walkthrough of the replacement process.
Yes, this is a very DIY-friendly job for someone with basic tools. The process involves unplugging the electrical connector, removing one 10mm bolt, and pulling the old sensor out. Just be sure to apply a little lubricant to the O-ring on the new sensor for easier installation.
What does the code P0340 mean on my Subaru Legacy?
P0340 indicates a malfunction in the camshaft position sensor 'A' circuit, which typically corresponds to Bank 1 (the passenger side on a Subaru). If you see P0345, that points to a problem with the sensor on Bank 2 (the driver's side).
Helpful Videos
Technical Specifications
OEM Part Numbers: 22056AA270
Electronic sensor with a single bolt mount and integrated O-ring seal.
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Subaru Legacy: