Modern cars can store fault codes for many reasons. A code tells the technician where the system detected a problem, but not always which part is definitely faulty.
A better workflow
- Confirm the customer complaint.
- Read relevant fault codes.
- Review live data or test results.
- Inspect wiring, leaks, mechanical condition or related systems.
- Recommend the repair after evidence points to the likely cause.
This approach can reduce unnecessary parts replacement and makes the repair recommendation easier for the owner to understand.
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