5 Top Subaru Camshaft Position Sensor A Circuit Bank 1 Replacements for Optimal Performance
Is your Subaru acting a little finicky? Perhaps you’ve noticed a nagging “Check Engine” light, rough idling, or even a sudden stall. These could be tell-tale signs of an issue with your vehicle’s camshaft position sensor. Specifically, if your diagnostic tool points to a “P0340” code, you’re likely dealing with a problem in the Subaru camshaft position sensor A circuit bank 1.
This little sensor plays a crucial role in your engine’s precise operation. It tells the engine control unit (ECU) exactly where the camshaft is, which is vital for calculating ignition timing and fuel injection. When it goes bad, your engine’s performance can really suffer.
But don’t fret! Replacing this sensor is a common fix, and it’s something many Subaru owners can tackle themselves. To help you find the right part and get your beloved Boxer engine running smoothly again, we’ve reviewed five top-quality replacement options. Let’s dive in!
How to Identify a Faulty Subaru Camshaft Position Sensor A Circuit Bank 1
Before you start shopping, it’s good to be sure. A common indicator of a failing camshaft position sensor, especially involving “circuit A bank 1,” is the P0340 diagnostic trouble code (DTC). Other symptoms might include:
- Check Engine Light: This is usually the first sign.
- Difficulty Starting: Your engine might crank for a long time or refuse to start.
- Rough Idling or Stalling: The engine might feel shaky when stationary or unexpectedly shut off.
- Decreased Fuel Economy: Inconsistent timing can lead to inefficient fuel use.
- Engine Misfires or Hesitation: You might feel a stutter or lack of power during acceleration.
If you’re experiencing these issues, a new Subaru camshaft position sensor A circuit bank 1 might be just what your car needs.
Top 5 Camshaft Position Sensors for Your Subaru
Here are our picks for reliable replacement sensors that can help resolve those pesky engine issues.
A-Premium Engine Camshaft Position Sensor (PN: 22056AA270 Compatible)
This A-Premium sensor is a fantastic choice if you’re looking for a reliable replacement that covers a wide range of newer Subaru models, as well as Scion BRZ/FR-S. What truly makes it stand out is its emphasis on enhancing overall engine performance and stability, suggesting that replacing sensors in pairs can lead to more consistent results. This attention to detail means you’re not just fixing a fault, but optimizing your engine’s timing for smoother acceleration and a better driving experience. Plus, A-Premium backs it up with a solid one-year warranty.
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Key Features:
- Wide compatibility with various Subaru models (BRZ, Forester, Impreza, Legacy, Outback, WRX, XV Crosstrek) and Scion FR-S.
- Reference Numbers: PC969, 5S13512, 2CAM0338, EC0187, 2351728, 22056AA270, SU00300414.
- 3-pin blade terminal for direct fit.
- Designed to upgrade engine performance and maintain precise ignition timing.
- Backed by a one-year unlimited-mileage guarantee.
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Pros:
- Excellent compatibility with many popular Subaru models (2011-2017 range).
- Promotes stable engine operation and smooth acceleration.
- Comes with a reassuring one-year warranty.
- High-quality construction for reliable ignition control.
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Cons:
- One specific Legacy model year might require programming, which could be an extra step.
- Primarily covers newer generations of Subaru vehicles.
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User Impressions: Customers often praise this sensor for its direct fit and for successfully clearing troublesome “Check Engine” lights. Many note the improvement in engine smoothness and overall responsiveness after installation, confirming its performance benefits.
HXYBBGS 4-Piece Engine Camshaft Position Sensor Set (PN: 22056AA270 Compatible)
For those who believe in having spares or prefer to tackle all relevant sensors at once, the HXYBBGS 4-piece set is an incredibly economical and practical solution. It offers the same broad compatibility as our first A-Premium pick but provides four sensors, which is perfect for vehicles with multiple camshaft sensors or for future-proofing. Crafted from high-quality materials and tested to meet or exceed OE standards, this set offers incredible value without compromising on performance, ensuring your engine runs reliably for miles to come.
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Key Features:
- OE Number: 22056-AA270, PC969, 5S13512, 2CAM0338, EC0187, 2351728, SU00300414.
- Fits a wide range of Subaru models (BRZ, Forester, Impreza, Legacy, Outback, WRX, XV Crosstrek) and Scion FR-S.
- Made from high-quality materials, professionally tested to meet or exceed OE standards.
- Package includes 4 engine camshaft position sensors.
- Responsive after-sales service.
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Pros:
- Fantastic value with a 4-piece set, ideal for replacing multiple sensors or having backups.
- Ensures stable and reliable performance due to professional testing.
- Wide vehicle fitment, covering many popular Subaru models.
- High-quality construction for durability.
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Cons:
- May be more sensors than an individual DIYer needs if only one is faulty.
- Lacks a specific stated warranty period like some other brands.
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User Impressions: Buyers are typically impressed by the quantity and quality offered at this price point. Many appreciate having multiple sensors on hand, making future replacements or concurrent maintenance easier and more cost-effective.
Quality Engine Camshaft Position Sensor (PN: 22056AA050 Compatible)
If your Subaru is an older model from the late 90s to early 2010s, this camshaft position sensor with part number 22056AA050 is likely the perfect fit. What makes this particular sensor stand out is its direct focus on resolving common and frustrating engine issues like irregular stalling, difficult starting, and engine vibrations. It’s built to meet or exceed OEM quality, providing a reliable solution specifically for an earlier generation of beloved Subaru vehicles.
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Key Features:
- Replaces part numbers: 22056AA050, PC190, PC190T, 5S1370.
- Perfect fitment for Subaru Impreza (1993-2010), Baja (2003-2006), Forester (1998-2010), Outback (2000-2011), and Legacy (1995-2012).
- Made from high-quality, durable materials, tested to meet or exceed OEM quality.
- Designed to solve common vehicle problems like irregular stalling, difficult starting, and accelerator hesitation.
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Pros:
- Specifically designed for a broad range of older Subaru models.
- Directly addresses and resolves common engine performance issues.
- High-quality construction, meeting OEM standards.
- A reliable choice for maintaining the performance of classic Subarus.
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Cons:
- Fitment is limited to older vehicle generations, not suitable for newer models.
- Requires careful checking of part numbers to ensure compatibility.
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User Impressions: Owners of older Subarus frequently report that this sensor is a direct, trouble-free replacement. They often highlight its effectiveness in immediately resolving frustrating symptoms like intermittent stalling and rough idle, bringing their vehicles back to life.
A-Premium Engine Camshaft Position Sensor (PN: 22056AA140 Compatible)
Another solid offering from A-Premium, this sensor (with reference number 22056AA140) caters to a different, yet equally popular, range of Subaru models from the mid-2000s to mid-2010s, including iconic WRX and WRX STI variants. What sets it apart is its direct OE replacement design, ensuring a seamless fit and function right out of the box. Coupled with A-Premium’s strong reputation and a generous one-year warranty, you can install this sensor with confidence, knowing you’re getting a meticulously crafted part built for longevity and reliable performance.
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Key Features:
- Vehicle fitment: Subaru Baja (2004-2006), Forester (2004-2013), Impreza (2004-2012), Legacy (2005-2009), Outback (2005-2009), WRX (2012-2016), WRX STI (2013-2019) – H4 2.5L.
- Reference Number: 22056AA140, 907847, 907-847.
- 3-pin blade terminal, black color, 1x sensor per package.
- Direct OE replacement for straightforward installation.
- Includes a one-year unlimited-mileage guarantee.
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Pros:
- Direct OE replacement for easy and accurate fitment.
- Excellent compatibility with specific H4 2.5L Subaru models, including performance variants.
- Backed by A-Premium’s reliable one-year warranty.
- Ensures precise engine timing and reliable performance.
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Cons:
- Fitment is limited to the specific models and engine types listed, so check carefully.
- Not a universal solution for all Subaru camshaft sensor needs.
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User Impressions: Many users appreciate the plug-and-play nature of this sensor, reporting that it resolves check engine lights related to camshaft sensor issues immediately. The A-Premium brand often garners praise for consistent quality and durable automotive parts.
Dorman 962-123 Engine Camshaft Position Sensor
Dorman is a name synonymous with high-quality aftermarket automotive parts, and their 962-123 Engine Camshaft Position Sensor is no exception. What makes this sensor a top pick is Dorman’s engineering philosophy: it’s not just a direct replacement, but it’s specifically designed to combat common failure points like heat and internal component damage. With over a century of automotive experience and product experts based in the United States, Dorman delivers a trustworthy solution that ensures your engine control unit receives accurate inputs for reliable performance.
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Key Features:
- Direct replacement: Matches the fit and function of an original sensor on specified vehicles.
- Ideal solution: Engineered to ensure proper ECU inputs when an original sensor fails from heat or internal damage.
- Durable construction: Designed and manufactured to strict specifications for reliable performance.
- Trustworthy quality: Backed by a team of product experts in the United States and over a century of automotive experience.
- Ensure fit: Use vehicle make, model, and trim level in the garage tool for exact fitment confirmation.
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Pros:
- Highly trusted brand with extensive automotive experience.
- Designed with improved durability to resist common failure causes.
- Engineered for direct fit and function, simplifying installation.
- Offers reliable performance, ensuring accurate ECU readings.
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Cons:
- Specific vehicle fitment needs to be confirmed via Dorman’s online tools, as it’s not explicitly listed in the description.
- May be slightly pricier than lesser-known brands, reflecting its quality and brand reputation.
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User Impressions: Dorman parts are a go-to for many mechanics and DIY enthusiasts due to their consistent quality and reliability. Users often confirm that these sensors fit perfectly and resolve their engine issues, delivering performance comparable to or exceeding OEM parts.
Frequently Asked Questions (FAQ)
What does a camshaft position sensor do in a Subaru?
The camshaft position sensor monitors the rotational speed and position of the camshaft, which controls the opening and closing of your engine’s valves. It sends this information to the Engine Control Unit (ECU) so the ECU can precisely time the fuel injection and ignition spark, ensuring your engine runs smoothly and efficiently.
What does “Subaru camshaft position sensor A circuit bank 1” mean?
This refers to a specific camshaft position sensor location and circuit within your engine. “Bank 1” typically refers to the side of the engine with cylinder #1. “Circuit A” usually denotes an intake camshaft position sensor, while “Circuit B” would refer to an exhaust camshaft position sensor. A “circuit” issue indicates a problem with the electrical signal path from the sensor.
What are the common symptoms of a bad Subaru camshaft position sensor?
Common symptoms include the “Check Engine” light illuminating (often with a P0340 or P0345 code), rough idling, engine stalling, difficulty starting, decreased fuel economy, and poor acceleration or misfires.
Can I drive my Subaru with a bad camshaft position sensor?
While your car might still run with a failing sensor, it’s not recommended to drive it for long. A faulty sensor can lead to erratic engine performance, reduced power, poor fuel economy, increased emissions, and potential damage to other engine components due to incorrect timing. It’s best to replace it as soon as possible.
How difficult is it to replace a camshaft position sensor on a Subaru?
For many Subaru models, replacing a camshaft position sensor is a relatively straightforward DIY task that requires basic hand tools. The sensor is usually located on the cylinder head or timing cover, often held in by a single bolt and connected by an electrical connector. However, location can vary by model and engine, so consulting a service manual is always a good idea.
What causes a camshaft position sensor to fail?
Camshaft position sensors can fail due to several reasons, including exposure to extreme engine heat, vibrations, internal electrical shorts, or simply wear and tear over time. Sometimes, debris in the engine oil can also interfere with its operation.
How much does a Subaru camshaft position sensor replacement cost?
The cost of the sensor itself typically ranges from $20 to $100 depending on the brand and specific Subaru model. If you do it yourself, that’s your only cost. If you have a mechanic replace it, expect to pay an additional $100-$300 or more in labor, as the time required can vary.
Is it important to use an OEM (Original Equipment Manufacturer) or aftermarket sensor?
While OEM sensors are designed specifically for your vehicle, high-quality aftermarket sensors (like those reviewed above) often meet or exceed OEM specifications and offer a more budget-friendly alternative without compromising performance or reliability. The key is to choose a reputable brand.
