You’ve connected your OBDII scanner, ready to diagnose your car’s health, and suddenly you see “INC.” What does this cryptic message mean? Don’t worry, this article explains everything about “INC” on an OBDII scanner, why it appears, and what you should do about it.
Decoding “INC” on Your OBDII Scanner
“INC” on an OBDII scanner simply means Incomplete. This indicates that a specific diagnostic monitor or readiness test within your vehicle’s onboard computer system hasn’t finished running.
Your car’s computer constantly performs self-checks to ensure all systems operate correctly. These are called diagnostic monitors. If a monitor hasn’t completed its checks, the scanner displays “INC.” This often happens after a recent battery disconnect, computer reset, or repairs, as the system needs to re-evaluate various components under specific driving conditions.
Understanding Diagnostic Monitors and Readiness Tests
Imagine using a professional-grade scanner like the Foxwell NT809. You might see “INC” next to specific monitors, such as the oxygen sensor monitor. This indicates the system needs more data, collected under specific driving conditions (like highway driving or idling), to complete its diagnosis. Until all monitors show “Complete,” your car might not pass an emissions test. The scanner helps you understand the status of these tests and identify potential issues.
For example, if you recently disconnected your car battery, the oxygen sensor monitor might show “INC.” The system needs to re-learn the sensor’s behavior under various driving conditions before it can complete the test. This might involve a mix of city and highway driving to expose the sensor to different engine loads and temperatures.
Addressing “INC” Readings on Your OBDII Scanner
If your OBDII scanner displays “INC,” don’t panic. Here’s what you can do:
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Drive Your Car: The most effective way to clear “INC” readings is to drive under varied conditions—city driving, highway driving, acceleration, deceleration—to allow the system to complete its diagnostic tests.
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Be Patient: Some tests require multiple drive cycles to complete. If “INC” persists after several days of driving, consult a mechanic. There might be an underlying issue preventing the monitor from completing its checks.
Preventing “INC” Readings and Maintaining Vehicle Health
To minimize “INC” readings:
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Drive Regularly: Regular driving, especially longer trips, allows the system to complete diagnostic tests naturally. Infrequent use can hinder the completion of these essential checks.
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Avoid Unnecessary Resets: Avoid disconnecting the battery or resetting the car’s computer unless absolutely necessary, as this triggers a restart of the entire diagnostic process.
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Routine Maintenance: Adhering to a routine maintenance schedule, including oil changes and filter replacements, ensures optimal vehicle performance and helps diagnostic tests run smoothly.
Conclusion: “INC” – Information, Not Alarm
An “INC” reading on your OBDII scanner is simply an informational status, not necessarily a cause for alarm. It signifies that your vehicle’s self-diagnostic process is ongoing. By understanding what “INC” means, taking appropriate action (like driving your car under varied conditions), and maintaining your vehicle properly, you can ensure its optimal performance and readiness for emissions tests. If “INC” persists despite regular driving, consulting a qualified mechanic is recommended.
