Diagnostics · Expert tip
Check grounds before electrical gremlins
A bad ground causes bizarre, intermittent electrical faults.
The expert tip
- Measure voltage drop across grounds, not just continuity
- A corroded ground can cause multiple unrelated codes
- Clean and tighten the main body and engine grounds
Source: Automotive electrical experts
Apply tips that match your car and manual. For anything safety-critical or high-voltage, use a qualified mechanic.