Bluetooth OBD2 scanners are handy tools for car enthusiasts and everyday drivers alike. They offer real-time data about your vehicle’s performance and potential issues right on your smartphone via apps like Torque. But a common question arises: will leaving a Kobra OBD2 scanner Bluetooth device plugged into your car drain the battery? Let’s dive into what car owners are saying and explore the potential for battery drain.
The original question came from a user wondering if it was lazy to leave their OBD2 scanner plugged in continuously. They were aware that even small electrical drains, like an interior light left on, can flatten a car battery. The concern was valid: could this small Bluetooth device cause a similar, albeit slower, battery drain?
OBD2 Scanner
User experiences in online forums provide a range of answers, highlighting that the situation isn’t always black and white. Many users report leaving their OBD2 scanners plugged in for extended periods without any noticeable battery drain. One user mentioned leaving a device plugged into an MX-5 for a year with no issues. These experiences suggest that for many modern vehicles, the parasitic drain from a Bluetooth OBD2 scanner is minimal and often insignificant.
However, not all experiences are the same. Some users have reported issues, particularly with older car models. One user with a 2007 Corsa noted that leaving the OBD2 scanner plugged in for more than a day prevented the car from starting. Unplugging the device resolved the issue immediately. This indicates that certain vehicles might be more susceptible to battery drain from OBD2 devices, or that some devices might have a slightly higher power draw than others.
So, what factors could influence whether your Bluetooth OBD2 scanner causes battery drain?
- Vehicle Age and Electrical System: Older cars, especially those with less sophisticated battery management systems, might be more vulnerable to even minor parasitic drains.
- Scanner Design and Power Consumption: Different OBD2 scanners may have varying levels of power consumption. Some might be designed for ultra-low power, while others could draw slightly more current.
- Vehicle’s “Sleep Mode”: Modern cars are designed to enter a sleep mode when turned off, reducing power consumption. However, some OBD2 scanners might interfere with this sleep mode in certain vehicles, leading to increased drain.
Despite the potential for minimal battery drain, the benefits of using a Bluetooth OBD2 scanner are clear for many car owners. Users highlight the Torque app and similar applications for:
- Real-time Performance Monitoring: Tracking engine revs, speed, boost levels, and more, especially useful for performance driving or track days.
- Diagnostic Capabilities: Reading and clearing fault codes, providing insights into potential engine or system problems.
- Fuel Efficiency Data: Monitoring real-time MPG and fuel consumption in vehicles without built-in displays.
In conclusion, while the majority of users seem to experience negligible battery drain from leaving their Bluetooth OBD2 scanners plugged in, it’s wise to be aware of the potential, especially if you own an older vehicle. If you notice any unusual battery issues, such as slow starts or a flat battery after leaving your car for a short period, try unplugging your OBD2 scanner when the car is not in use. Monitoring your car’s behavior after plugging and unplugging the device can help you determine if your specific setup is contributing to any battery drain. For most modern vehicles, the convenience of leaving the scanner plugged in likely outweighs the minimal risk of battery drain.
