Shopping for a used car can be exciting but also nerve-wracking. You want to make sure you’re getting a reliable vehicle without hidden problems. A reader recently asked about bringing a scan tool along when inspecting a used car. Here’s why that’s actually a smart move for both buyers and sellers.
Using a scan tool, sometimes known as an OBD2 scanner or car diagnostic tool, during a pre-purchase inspection can reveal valuable information beyond what you can see with a visual check. It’s not just about reading trouble codes; it’s about getting a deeper understanding of the car’s health.
Why Using a Scan Tool is Beneficial
For Buyers, knowledge is power. A scan tool can quickly check the car’s computer system for any stored fault codes. Even if the check engine light isn’t currently on, there might be pending or historical codes that indicate past or intermittent issues. Some less scrupulous sellers might try to hide problems by disconnecting the battery to temporarily clear warning lights. A scan tool can reveal if codes have been recently cleared, raising a red flag about potential undisclosed issues.
For Sellers, using a scan tool proactively can build trust and transparency. Showing a potential buyer a clean scan report, or honestly disclosing any codes and addressing them, demonstrates integrity. It can streamline the selling process by addressing concerns upfront.
Furthermore, advanced scan tools offer even more benefits. Some can read data from various modules in the car, not just the engine computer. They might also be able to verify the actual mileage, which can be crucial in detecting odometer fraud, although this is less common with modern vehicles but still a potential advantage of sophisticated tools.
One real-world example highlights the importance of using a scan tool. Recently, a neighbor was considering buying a used car that appeared to be in good condition with relatively low mileage and no check engine light. However, a scan with an Innova 7111 scan tool revealed a shocking 72 fault codes across different systems. This discovery immediately signaled that the car had significant underlying problems, prompting a wise decision to continue the car search.
What Can a Scan Tool Detect?
When you plug in a scan tool, you’re essentially tapping into the car’s onboard diagnostic system. Here are key things to look for:
- Check Engine Light History: A scan tool can often show how recently the check engine light has been active. If it was recently cleared, especially just before a sale, it warrants further investigation.
- Number and Type of Fault Codes: The presence of numerous fault codes, even if they seem minor, can indicate systemic issues or neglect. The type of codes can pinpoint problem areas, whether they are related to the engine, transmission, ABS, airbags, or other systems.
- Module Scanning Capability: More advanced scan tools can scan beyond the basic powertrain control module (PCM) and check other modules like the body control module (BCM), transmission control module (TCM), and more. This comprehensive scan can uncover problems that might not trigger the check engine light but are still significant.
Conclusion: Scan Tools – A Must-Have for Used Car Buyers
In conclusion, bringing a scan tool when looking at a used car is highly recommended. It empowers buyers with critical information, helps ensure a more transparent transaction, and can potentially save you from purchasing a vehicle with hidden problems. Whether you are a buyer or a seller, understanding the diagnostic data a scan tool provides is a valuable step in the used car market. For buyers, it’s a small investment in peace of mind; for sellers, it’s an opportunity to build trust and facilitate a smoother sale.
