TOPAZ BACB51-753011 Auto Trans Sensor 941024959957 90512495 1.8L L4

( Brand: Topaz ), ( Manufacturer Part Number: BACB51-753011 ), ( Part Type: Tran Sensor ), ( Fitment Type: Direct Replacement ), ( UPC: 941024959957 ), ( Manufacturer Warranty: 5 Years ), ( Finish: Same As Oem ), ( Ipn: 90512495 )

Review TOPAZ Auto Trans Speed Sensor Saturn 1.8l L4 fits ASTRA 2008–2009

The **Topaz BACB51-753011 Automatic Transmission Sensor** is a high-performance, precision-engineered replacement part designed specifically for the **2008 2009 Saturn Astra with a 1.8L L4 engine**, featuring the **GM 90512495** transmission control sensor. This sensor plays a critical role in the vehicle s automatic transmission system by monitoring the position of the torque converter clutch (TCC) and providing real-time feedback to the transmission control module (TCM). When the original sensor fails often due to wear, electrical corrosion, or mechanical stress it can trigger erratic shifting, delayed engagement, or even a complete transmission malfunction, leaving drivers stranded or forcing costly repairs. The **Topaz BACB51-753011** eliminates these issues with its **direct-fit, OEM-quality construction**, ensuring seamless integration with the Saturn Astra s transmission system.

Crafted from **durable, corrosion-resistant materials**, this sensor is built to withstand the harsh conditions of under-the-hood environments, including extreme temperatures, moisture, and vibration. Its **precise internal components**, including a high-accuracy potentiometer and robust wiring harness, guarantee accurate signal transmission to the TCM, allowing for smooth and responsive shifting between gears. Unlike generic aftermarket alternatives that may lack the necessary calibration or structural integrity, the **Topaz sensor is engineered to match the exact specifications of the original equipment manufacturer (OEM)**, ensuring compatibility and reliability. This attention to detail extends the lifespan of the transmission while restoring optimal performance, reducing the risk of further damage to the torque converter or TCM.

Installation of the **Topaz BACB51-753011** is straightforward, thanks to its **plug-and-play design**, which requires no additional modifications or specialized tools beyond basic automotive equipment. The sensor s **secure mounting bracket** ensures a tight fit, preventing loosening or misalignment during operation, while its **high-quality connectors** resist oxidation and maintain a stable electrical connection. Once installed, drivers can expect an immediate improvement in transmission behavior, including smoother upshifts and downshifts, reduced jerking, and the elimination of the check engine light (CEL) associated with transmission sensor codes (such as P0740, P0741, or P0742). Whether addressing a failing sensor or upgrading for preventive maintenance, this **Topaz replacement sensor** delivers the performance and durability needed to keep the Saturn Astra s automatic transmission running efficiently for years to come.

**Pros and Cons of buying a Topaz BACB51-753011 Auto Transmission Sensor for a 2008-2009 Saturn Astra (1.8L L4, Part #90512495)**

1. **Direct Fitment** The Topaz BACB51-753011 is specifically designed for the 2008-2009 Saturn Astra with a 1.8L engine, ensuring compatibility without modifications. This reduces the risk of installation issues or incorrect part selection.

2. **High-Quality Construction** Topaz is a reputable brand known for producing reliable automotive sensors and components. The sensor is likely built to industry standards, offering durability and consistent performance.

3. **Easy Installation** As an OEM replacement, the sensor should plug-and-play with minimal effort, requiring only basic tools. This makes it a convenient option for DIYers or those without extensive mechanical experience.

4. **Cost-Effective Alternative** While not an OEM part, it is often priced lower than genuine GM (OEM) sensors, providing a budget-friendly solution without sacrificing quality.

5. **Widely Available** This part is stocked by many auto parts retailers (both online and in-store), ensuring easy access for purchase and potential returns if needed.

6. **Prevents Transmission Issues** A faulty transmission sensor can cause shifting problems, rough acceleration, or even stall the vehicle. Replacing it with a reliable sensor restores proper transmission function, improving drivability.

7. **Long-Term Reliability** If the sensor fails prematurely due to poor quality, Topaz s reputation suggests it may last longer than cheaper, no-name alternatives, reducing the need for frequent replacements.

---

1. **Aftermarket Part** While Topaz is a trusted brand, it is not an original equipment manufacturer (OEM) part. Some customers prefer OEM components for perceived longevity or warranty coverage, though Topaz is often a high-quality aftermarket alternative.

2. **Potential Quality Variability** Although Topaz is generally reliable, there is a slight risk of receiving a defective unit, especially if purchased from a third-party seller. Always buy from authorized retailers to minimize this risk.

3. **Limited Warranty** Topaz parts typically come with a shorter warranty (often 6 months to 1 year) compared to OEM parts, which may have longer coverage. This could be a concern if the sensor fails shortly after installation.

4. **Mixed Reviews on Fit** Some users report minor fitment issues, such as slight resistance during installation or slight gaps in wiring connectors. While rare, this could require additional effort or minor adjustments.

5. **Price Sensitivity** While cheaper than OEM, it may still be more expensive than the absolute cheapest generic sensors available. Budget-conscious buyers might opt for a lower-cost option if they are unsure about the brand s reliability.

6. **No GM Warranty Coverage** If the sensor fails within the vehicle s warranty period, GM may not cover it as an OEM part would, leaving the buyer responsible for repairs.

7. **Potential Counterfeit Risk** Purchasing from untrusted sellers (e.g., unverified online marketplaces) could result in receiving a counterfeit or low-quality knockoff, which may not function as intended.

---

The **Topaz BACB51-753011 auto transmission sensor** is a strong aftermarket replacement for the 2008-2009 Saturn Astra s transmission sensor. It offers a balance of quality, ease of installation, and affordability, making it a practical choice for most drivers. While it is not an OEM part, Topaz s reputation ensures it is unlikely to fail prematurely, and its direct fitment reduces installation hassles.

The primary drawbacks being an aftermarket part, potential warranty limitations, and the rare risk of fitment issues are outweighed by its reliability and cost-effectiveness for most users. If budget is a major concern, it is still a safer option than the cheapest generic sensors, which may fail sooner.

---

- You prioritize a reliable, easy-to-install replacement without spending OEM prices.

- You purchase it from a trusted retailer (e.g., RockAuto, Amazon, local auto parts stores) to avoid counterfeit parts.

- You are comfortable with aftermarket parts and do not require OEM warranty coverage.

- You want the longest possible warranty and absolute peace of mind.

- You are willing to pay a premium for OEM quality, especially if the sensor is critical to your vehicle s performance.

- You have access to a reliable source for OEM parts (e.g., GM dealership, authorized online sellers).

- You are on a very tight budget and have no other options.

- You are prepared to research the seller thoroughly to ensure the part is genuine.

For the vast majority of Saturn Astra owners, the **Topaz sensor is the best balance of quality, price, and convenience**. Install it carefully, follow wiring diagrams, and test the transmission afterward to confirm proper function. If issues persist, double-check the installation or consult a mechanic.

Details:

Fast Shipping. Fitments:Saturn Astra 2008 2009 Auto Trans Speed Sensor For Saturn 1.8L L4 90512495.

specifications cranshafengin:

• for models: Astra
• for makes: Saturn
• for years: 2008-2009
• brand: Topaz
• mpn: Bacb51-753011
• part type: Tran Sensor
• fitment type: Direct Replacement
• upc: 941024959957
• manufacturer warranty: 5 Years
• finish: Same As Oem
• ipn: 90512495

seller cranshafengin:

• rating: 99.7%
• city: Memphis, Tennessee
• # reviews: 26473

shipping cranshafengin:

• type: Fixed
• service: Standard
• class: Standard
• cost: $0.00
• transit: 2-5 Days

returns cranshafengin:

• policy: Returns Accepted
• time: 30 Days
• paid by: Seller

offer cranshafengin:

• sold: 0
• quantity: 2
• best offers: True
• options: Ship-to-home
• started: April 9, 2026
• availability: In Stock

general cranshafengin:

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

payments cranshafengin:

• wallet: Paypal
• other
• credit card: Visa