Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSAUDI2025A4 QUATTRO PRESTIGEREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE CONTROL SYSTEMSGENERIC SCAN TOOL (DPAA) (GENERAL INFORMATION)ST GENERIC SCAN TOOLDIAGNOSIS AND TESTINGPRELIMINARY CHECKELECTRICAL TESTING

2025 Audi A4 Quattro Prestige

Electrical Testing

2025 Audi A4 Quattro PrestigeSECTION Electrical Testing

Step	Procedure	Result / Action to Take
1	CONNECT: Scan Tool. IGNITION: ON. CHECK: For stored or related DTCs. -- Were any other DTCs stored?	-- YES: GO TO: Step 2 Electrical Testing => 2 . -- NO: GO TO: Step 3 Electrical Testing => 3 .
2	Repair these DTCs first before performing any of the following steps.	GO TO: Proper Diagnostic procedure per the stored DTC. Refer to ENGINE DTC TABLES .
3	Using the Scan Tool, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY . Perform a road test to attempt to duplicate the customers complaint. -- Does DTC return?	-- YES: GO TO: Step 4 Electrical Testing => 4 . -- NO: GO TO: Step 5 Electrical Testing => 5 .
4	Perform the diagnostic procedure for that DTC.	GO TO: Proper Diagnostic procedure per the stored DTC. Refer to ENGINE DTC TABLES .
5	FAULT: Intermittent or a sporadic condition. CHECK: Suspected components. PERFORM: Visual Inspection of wiring and components. CHECK: Wiring for open, high resistance, short or harness connector for damage, corrosion, loose or broken terminals. REPAIR: Faulty wiring or connector.	Perform a road test to verify the repair. Generate readiness code. Refer to READINESS CODE .

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.