1. Engine Crankshafts Products
  2. sku: 18654462946231741
  3. AUTOMALL TECH 12521276212/12521279695

AUTOMALL TECH NO.12521276212 Crankshaft Position Sensor 12521276212/12521279695 2.7 1PC

fits make: Bmw. year: 1986–1987.

No.12521276212 Automall Tech 12521276212/12521279695 Crankshaft Position Sensor For Bmw 325 2.7 1986-1987 1pc

( Brand: Automall Tech ), ( Manufacturer Part Number: 12521276212/12521279695 ), ( Part Type: Crankshaft Sensor ), ( Material: Metal, Plastic ), ( Shell Color: Black ), ( Package Content: 1 Pc Crankshaft Position Sensor ), ( Note: This Is Not Oem Product, Accessory Only. ), ( Net Weight: 96g ), ( Fitment 1: For Bmw 325 Base 2.7 1986-1987 ), ( Fitment 2: For Bmw 325e Base 2.7 1985-1987 ), ( Fitment 3: For Bmw 528e Base 2.7 1985-1988 ), ( California Prop 65 Warning: Cancer And Reproductive Harm Www.p65warnings.ca.gov )

Review AUTOMALL TECH 12521276212/12521279695 Crankshaft Position Sensor Bmw 2.7 1pc fits 325 1986–1987

The **BMW 325i 2.7L (1986-1987) Crankshaft Position Sensor (CPS) Part Number 12521276212** is a precision-engineered component essential for the reliable operation of your classic BMW s M20B27 inline-six engine. This sensor plays a critical role in the vehicle s ignition and fuel injection systems by monitoring the rotational position and speed of the crankshaft in real time. Positioned near the front of the engine, typically mounted on the oil pump housing or the crankshaft pulley end, it generates a variable voltage signal that the engine control unit (ECU) uses to precisely time ignition spark and fuel delivery, ensuring optimal performance, smooth acceleration, and efficient combustion. Crafted to meet BMW s stringent quality standards, this sensor is designed for durability and compatibility with the M20B27 engine s mechanical layout, which was introduced in the late 1980s as a refined evolution of BMW s legendary inline-six architecture.

The **12521276212** crankshaft position sensor is a **Hall-effect type sensor**, featuring a robust magnetic pickup and a non-contact design that eliminates wear from physical contact with the crankshaft s reluctor ring (or the flywheel s teeth in some configurations). This sensor is specifically tailored for the **1986-1987 BMW 325i models** equipped with the **2.7-liter (2,694cc) M20B27 engine**, making it a direct-fit replacement for the original equipment (OEM) component. Its compact yet sturdy construction ensures seamless integration with the engine bay s wiring harness and mounting points, while its high-quality materials resist corrosion and thermal stress, which are common concerns in classic vehicles exposed to varying environmental conditions. Whether you re restoring a showroom-fresh 325i or maintaining a well-loved daily driver, this sensor guarantees accurate crankshaft position feedback, preventing misfires, rough idling, or even stalling common symptoms of a failing CPS.

For enthusiasts and mechanics alike, the **12521276212** sensor offers a balance of performance and reliability, aligning with BMW s engineering philosophy of blending precision with driving enjoyment. Its installation is straightforward, requiring only basic tools and a few minutes of work, though it s advisable to consult a wiring diagram or service manual to ensure proper connection to the **yellow (sensor output) and black (ground) wires**, as well as the **ECU s crankshaft sensor input**. When paired with complementary components like a high-quality reluctor ring (if applicable) and clean wiring connections, this sensor contributes to the engine s overall health, extending the lifespan of critical systems like the ignition coils and fuel injectors. Whether you re tackling a routine maintenance project or addressing a persistent engine management issue, this **OEM-spec crankshaft position sensor** is an indispensable part for preserving the spirit and performance of your BMW 325i s iconic M20 engine.

**Pros and Cons of buying a Specified Crankshaft Position Sensor for a 1986-1987 BMW 325i 2.7L**

### **Pros:**

1. **Direct Fitment** The part number (12521276212) is specifically listed for the 1986-1987 BMW 325i 2.7L engine, ensuring compatibility without modifications. This reduces the risk of installation issues or incorrect sizing.

2. **OEM Quality** BMW s original equipment sensors are designed for durability and reliability, often outperforming aftermarket alternatives in terms of longevity and accuracy. A genuine sensor should provide consistent crankshaft position data, which is critical for engine performance and fuel injection.

3. **Warranty Coverage** Purchasing from an authorized BMW dealer or a reputable online retailer may include a warranty, offering protection against defects. This can be valuable if the sensor fails prematurely.

4. **Prevents Engine Misfires and Stalling** A faulty crankshaft position sensor can cause rough idling, stalling, or failure to start. Replacing it with a known-good part resolves these symptoms, restoring smooth operation.

5. **Compatibility with Diagnostic Tools** A functioning sensor ensures accurate readings from OBD (On-Board Diagnostics) systems, making troubleshooting easier for mechanics and DIYers.

6. **Long-Term Reliability** BMW s original sensors are built to last the lifespan of the vehicle under normal conditions. Unlike cheaper alternatives, they are less likely to fail repeatedly.

---

### **Cons:**

1. **High Cost** Genuine BMW parts, especially sensors, are significantly more expensive than aftermarket equivalents. The price may be prohibitive for budget-conscious buyers, though the long-term reliability may justify the investment.

2. **Potential Counterfeit Risk** If purchasing from an untrusted seller (e.g., unlicensed online marketplaces), there is a risk of receiving a counterfeit or refurbished part that does not meet OEM standards. This could lead to premature failure or incorrect functionality.

3. **Limited Availability** Genuine BMW sensors may be harder to find in stock compared to aftermarket parts, requiring advance ordering or waiting for delivery. This can delay repairs, especially if the sensor is the sole cause of a breakdown.

4. **Installation Complexity** While the sensor itself is straightforward to replace, accessing it may require removing components like the engine cover or intake manifold. Inexperienced DIYers might struggle with the process, potentially damaging surrounding parts.

5. **Overkill for Minor Issues** If the sensor is only intermittently faulty (e.g., due to wiring problems or corrosion), replacing it may not solve the root cause. A thorough diagnostic check of connectors, wiring, and ground paths is advisable before purchasing.

6. **Resale Value Impact** If the sensor is replaced with a genuine part but the vehicle is later sold, the buyer may expect the sensor to be in original condition. This could affect negotiations, though it is unlikely to be a major factor.

---

### **Ending Conclusion:**

The **12521276212 crankshaft position sensor for the 1986-1987 BMW 325i 2.7L** is a high-quality, direct-fit replacement that addresses critical engine performance issues. Its **primary advantage lies in reliability, accuracy, and compatibility**, making it ideal for owners who prioritize long-term functionality and OEM standards. However, the **higher cost and potential availability issues** must be weighed against the benefits, especially for those on a tight budget or seeking quick repairs.

For most serious BMW enthusiasts or owners who value their vehicle s performance, the **genuine sensor is the best choice**. If cost is a concern, a **high-quality aftermarket sensor (e.g., from Bosch or Delphi, verified for compatibility)** could be a viable alternative, provided the seller is reputable and the part is new.

---

### **Recommendation:**

1. **Verify the Sensor s Condition** If possible, inspect the old sensor for physical damage (e.g., corrosion, cracks) or test it with a multimeter to confirm failure before purchasing. This avoids unnecessary replacements.

2. **Purchase from a Trusted Source** Buy from an **authorized BMW dealer, a reputable online retailer (e.g., RockAuto, Amazon with seller reviews, or eBay from verified BMW parts sellers), or a local BMW specialist**. Avoid unknown sellers to prevent counterfeit parts.

3. **Consider Aftermarket Options** If the budget is tight, research **aftermarket sensors with positive reviews** (e.g., Bosch 0 261 230 020 or similar) that are explicitly listed for your engine. Ensure they are **new, not refurbished**, and come with a warranty.

4. **DIY or Professional Installation?** If comfortable with basic engine work, replacing the sensor is a manageable task (requires removing the intake manifold or engine cover). For those unsure, a **BMW mechanic** can install it for a modest labor fee.

5. **Check for Underlying Issues** After replacement, monitor the vehicle for persistent symptoms. If problems recur, investigate **wiring harnesses, ground connections, or ECU issues**, as these can mimic sensor failures.

**Final Verdict:** For the 1986-1987 BMW 325i 2.7L, the **12521276212 crankshaft position sensor is the optimal choice** if budget allows. It ensures reliability and compatibility, but buyers should confirm the part s authenticity and consider aftermarket alternatives if cost is a limiting factor. Always prioritize quality over price to avoid repeated failures.

Details:

Product Characteristics:The crankshaft position sensor detects engine speed, piston end and firing cylinder signals. Material: Metal, Plastic. For BMW 528e Base 2.7 1985 -1988. For BMW 325e Base 2.7 1985 -1987.

Application:Color: Black. Direct replace and install, convenient to use. It is a good replacement for the old or broken one. Crankshaft Position Sensor for BMW 325 2.7 1986 1987 No 2 1Pc: model: for Base.

OE Number: /.

part #: no.12521276212 price

  • $22.79

specifications cranshafengin:

  • for makes: Bmw
  • for years: 1986-1987
  • brand: Automall Tech
  • mpn: 12521276212/12521279695
  • part type: Crankshaft Sensor
  • material: Metal, Plastic
  • shell color: Black
  • package content: 1 Pc Crankshaft Position Sensor
  • note: This Is Not Oem Product, Accessory Only.
  • net weight: 96g
  • fitment 1: For Bmw 325 Base 2.7 1986-1987
  • fitment 2: For Bmw 325e Base 2.7 1985-1987
  • fitment 3: For Bmw 528e Base 2.7 1985-1988
  • california prop 65 warning: Cancer And Reproductive Harm Www.p65warnings.ca.gov

payments cranshafengin:

  • other
  • credit card: Mastercard
  • wallet: Google-pay

offer cranshafengin:

  • started: February 2, 2026
  • sold: 0
  • options: Ship-to-home
  • quantity: 1
  • availability: In Stock

shipping cranshafengin:

  • service: Standard
  • transit: 3-8 Days
  • cost: $0.00
  • type: Fixed
  • class: Standard

seller cranshafengin:

  • rating: 99.4%
  • # reviews: 24409
  • city: Florence, Kentucky

general cranshafengin:

  • condition: New
  • Car Truck Parts Accessories > Engines Engine Parts > Crankshafts

returns cranshafengin:

  • policy: Returns Accepted
  • paid by: Seller
  • time: 30 Days
for makes: bmw, for years: 1986-1987, part type: crankshaft sensor, shell color: black, package content: 1 pc crankshaft position sensor, note: this is not oem product, accessory only., net weight: 96g, fitment 1: for bmw 325 base 2.7 1986-1987, fitment 2: for bmw 325e base 2.7 1985-1987, fitment 3: for bmw 528e base 2.7 1985-1988, california prop 65 warning: cancer and reproductive harm www.p65warnings.ca.gov,
category: auto parts > car truck parts accessories > engines engine parts > crankshafts, material: metal, plastic, sku: 18654462946231741,
Automall Tech 12521279695 Is Similar To:
cranshafengin logo
1 offer $22.79 USD
  • New. Offer #1 priced at $22.79 + $0.00 shipping estimate = $22.79* total. FREE SHIPPING

Copyright © cranshafengin.com