When a DIY Upgrade Leads to Check Engine Light After Modification: How to Roll Back Safely
When a DIY upgrade triggers a check engine light, first roll back changes safely by restoring OEM wiring routes and rechecking sensor connections. Disconnect power, verify grounds, and confirm that vent, vacuum, and fuel lines are correctly reattached. Reassemble in reverse order of the modification, then scan for codes and compare live data to factory…