What Error Codes and Fault Messages Represent

Modern vehicles continuously monitor their systems and store fault messages when irregular behavior is detected. These messages can relate to temporary issues, sensor readings, or deeper system problems.

Not all error codes indicate serious faults, but understanding their context is essential when evaluating a used vehicle.

Why Fault Patterns Matter More Than Single Errors

A single stored error may be harmless, while repeated or related faults often signal underlying issues. Fault frequency, system type, and consistency over time provide insight into whether a problem was resolved or ignored.

Reviewing fault data alongside service history offers a more accurate assessment than relying on dashboard warnings alone.

Want to understand whether stored faults are minor or a warning sign?

Review the vehicle’s diagnostic history before making assumptions.

How Error Codes Help Assess Vehicle Risk

Interpreting error codes correctly helps buyers avoid vehicles with unresolved or recurring issues.

When combined with service records and usage data through CheckVIN, fault messages become a powerful indicator of overall vehicle health and long-term reliability.

Before committing to a purchase, review fault patterns to avoid hidden problems.