DIY: How to Scan a Check Engine Light (OBD2)

Difficulty Level

Tools/Supplies Needed:

• OBD2 code reader

Procedure:

• the OBD2 port should be located within two feet of the steering wheel, either under the dashboard or center console
• some maybe covered with a trim cap that will need to be removed
• ensure the vehicle is off and connect the OBD2 code reader
• some vehicle may only read with the key off, the key in the on position, or whitely vehicle is running
• depending on your model of code reader, you maybe required to press a button to scan, others will scan automatically such as what I've shown in the video
• it will take a moment to scan the codes
• once done the codes will pop up
• you will be able to scroll through if there are multiple errors present if you wish, you can also erase the codes by pressing a certain button on the code reader
• you can also write down the code and then do a search to determine what the fault codes refer to, then proceed with any repairs needed

Frequently Asked Questions (FAQ):

How can I retrieve the codes once they're deleted?

You cannot, unless the fault continues and the vehicle's computer will re-register the code again.

Video tutorial on how to scan your vehicle with a generic OBD II code reader to diagnose the check engine light (CEL). How the code reader operates may vary between makes and models. OBD II was used on vehicles in the mid 1990s and newer. Before OBD II was the OBD I system which needs a specific reader for each vehicle. This particular tutorial was done on a 2004 Volkswagen Golf TDI. Once the code is found, a simple internet search using your vehicle's make, model, and the code found will allow you to search what caused the issue, and what can be done to solve the problem. The internet search allows you to search the online database through car forums, online manuals, etc to help solve the issue. If you have solved the issue causing the fault code and the vehicle does not clear the fault code, you may need to clear the code using a code reader. Or if you hate seeing the check engine light then you can clear it, but if the problem persists, you will need to fix the issue.