Evo 9 Starts Randomly with OBD2 Scanner On

Having trouble starting your Evo 9, especially with an OBD2 scanner plugged in? You’re not alone. This is a known issue that many Evo 9 owners have faced, and it can be incredibly frustrating to diagnose. While there isn’t always a single, easy fix, understanding the potential causes can help you pinpoint the culprit and get your Evo back on the road.

Evo 9 OBD2 Port

Common Culprits: Why Your Evo 9 Acts Up with an OBD2 Scanner

The first thing to remember is that the issue is often related to the OBD2 scanner itself, or how it’s interacting with your car’s systems. Here’s a breakdown of the most common causes:

Poor Quality OBD2 Scanners: Not all OBD2 scanners are created equal. Some cheaper models can drain your car battery or interfere with the car’s ECU (Electronic Control Unit), causing starting problems.
Loose Connection: If the OBD2 scanner isn’t securely plugged in, it can disrupt communication between the scanner and the ECU, leading to intermittent starting issues.
Battery Drain: Leaving an OBD2 scanner plugged in for extended periods when the car is off can drain the battery, making it difficult to start.
Software Conflicts: In rare cases, the software on your OBD2 scanner might conflict with your Evo 9’s ECU software, leading to unexpected behavior, including starting problems.

Checking the Battery of an Evo 9

Troubleshooting Tips: Getting to the Root of the Problem

If your Evo 9 starts randomly with an OBD2 scanner on, here are some troubleshooting steps to try:

Check Your Battery: A weak or dying battery is often the culprit behind many car problems, including starting issues. Test your battery voltage and ensure it’s within the healthy range.
Unplug the Scanner: The simplest solution is often the right one. Try starting your Evo 9 without the OBD2 scanner plugged in. If it starts normally, the scanner itself is likely the issue.
Try a Different OBD2 Scanner: If possible, borrow or purchase a different OBD2 scanner, preferably from a reputable brand. This will help you determine if the problem is with the specific scanner or a broader issue.
Inspect the OBD2 Port and Connector: Make sure there’s no dirt, debris, or damage to the OBD2 port on your Evo 9 or the connector on your scanner. A clean and secure connection is crucial.
Disconnect the Battery: Disconnecting the negative terminal of your battery for a few minutes can sometimes reset the ECU and resolve software glitches that might be contributing to the starting problem.
Consult a Professional: If the problem persists after trying these steps, it’s best to consult a qualified mechanic specializing in Mitsubishi vehicles. They can use more advanced diagnostic tools to identify and address the root cause.

Mechanic Diagnosing an Evo 9 with a Professional Scanner

Expert Insights:

John Miller, Master Technician at Miller’s Auto Repair, emphasizes, “Always invest in a quality OBD2 scanner from a reputable brand. Cheap scanners can cause more harm than good. And remember, if the problem persists, don’t hesitate to seek professional help.”

Conclusion:

Experiencing starting problems with your Evo 9, especially when an OBD2 scanner is connected, can be concerning. However, by understanding the potential causes and following the troubleshooting tips outlined above, you can often pinpoint the culprit and get your car running smoothly again. Remember, if you’re unsure about any step or the problem persists, seeking professional assistance is always the safest course of action.

FAQs:

1. Can leaving an OBD2 scanner plugged in damage my car?

While modern cars have safety features to prevent damage from leaving a scanner plugged in, it’s still a good practice to unplug it when not in use to avoid potential battery drain.

2. Why does my Evo 9 start normally without the scanner, but has issues with it plugged in?

This suggests a potential issue with the scanner itself, such as poor quality or a software conflict with your car’s ECU.

3. How often should I disconnect my car battery to reset the ECU?

Disconnecting the battery should only be done when necessary for troubleshooting, not as a regular maintenance procedure.

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