Introduction: The Small Parts That Guard Your Big Investment
When you purchase a Remanufactured Engines from Jasper Auto Parts, you are investing in thousands of dollars’ worth of precision machining, new internal components, and expert labour. It is a new heart for your vehicle, built to provide many years of reliable service.
Yet, many customers risk this entire investment by reusing a handful of small, inexpensive parts: the old engine sensors.
Engine sensors—like the oxygen sensor or the coolant temperature sensor—are the eyes and ears of your engine control unit (ECU). Reusing old sensors can send faulty, corrupted, or slow signals to your ECU, causing the perfect Remanufactured Engines to run poorly, overheat, and potentially fail.
Here is why reusing old sensors is a gamble you cannot afford to take, and which ones must be replaced to protect your investment and maintain your warranty.
1. The Risk of Sensor Signal Degradation
An engine sensor doesn’t fail all at once; its signal often degrades slowly over time. The sensor still “works,” but it reports data inaccurately or too slowly.
- Corrupted Data: An old Oxygen (O₂) sensor might report that the engine is running lean when it is actually rich. The ECU, believing the bad data, adjusts the fuel mixture incorrectly.
- Poor Performance: This false information leads to misfires, reduced fuel economy, and power loss, making the new Remanufactured Engines feel sluggish and inefficient.
- Physical Damage: The worst outcome is physical damage. A faulty coolant temperature sensor, for example, can prevent the fan from engaging, causing the brand-new engine to overheat—a guaranteed path to major repair or voiding the warranty.
2. The Critical Sensors That Must Be Replaced
While the basic engine block comes ready to accept parts, these external sensors and switches are essential for the proper function and longevity of your Remanufactured Engines and should always be replaced with new, high-quality units:
| Sensor/Switch | Why Replacement is Mandatory | Risk of Reusing Old Unit |
| Coolant Temperature Sensor (CTS) | Controls fan activation and fuel trim. | Failure to signal overheating, leading to warpage. |
| Oxygen (O₂) Sensors | Crucial for emissions and calculating the air/fuel ratio. | Causes incorrect fuel mixture, leading to high heat and damage. |
| Crankshaft/Camshaft Position Sensor | Critical for ignition timing and injector pulse. | Causes hard starting, random stalling, and misfires. |
| Oil Pressure Switch/Sender | Alerts the driver to low oil pressure. | False readings or failure to warn of life-threatening oil starvation. |
3. The Warranty Connection: Don’t Risk It
Jasper Auto Parts provides an industry-leading 3-Year/100,000-Mile Nationwide Warranty because we stand by the quality of our product. However, this warranty does not cover failures caused by external accessory components.
If your new Remanufactured Engines overheats because an old, reused temperature sensor failed to activate the cooling fan, the resulting damage (like a cracked cylinder head or blown gasket) will likely be deemed an external failure—not a defect in the remanufacturing process.
The minimal cost of replacing critical sensors is the cheapest insurance policy you can buy for your major engine investment.
Conclusion: Quality In, Quality Out
You’ve invested in the best engine available. Don’t compromise its performance or longevity by reusing parts that have already lived a long, stressed life. By pairing your new Remanufactured Engines with new, quality sensors, switches, and components sourced from Jasper Auto Parts, you ensure the data going into your ECU is as accurate as the engineering inside the block.
Protect your investment and guarantee years of smooth, reliable driving.
