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 MANUALSAUDI2004A4 SEDAN (8E2) L4-1.8L TURBO (AMB)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESSCAN TOOL TESTINGWITH GENERIC SCAN TOOLDIAGNOSTIC MODE 4: RESET/ERASE DIAGNOSTIC DATA
2004 Audi A4 Sedan (8E2) L4-1.8L Turbo (AMB)
Diagnostic Mode 4: Reset/Erase Diagnostic Data
2004 Audi A4 Sedan (8E2) L4-1.8L Turbo (AMB)SECTION Diagnostic Mode 4: Reset/Erase Diagnostic Data
Mode 4: Reset/erase Diagnostic Data
The following functions are performed in this diagnostic mode:
- All emission relevant malfunctions in DTC memory will be erased.
- The operating conditions at which a malfunction was stored will be reset see to "Mode 2: Check operating conditions". Diagnostic Mode 2: Checking Operating Conditions
- All adaptation values will be reset.
- All test results of the diagnostic functions of control module will be reset.
Work procedure
- Connect diagnostic tester. Diagnostic Tester, Connecting
- Start engine and let run at idle.
- In diagnostic function "33 - OBD", first select "Mode 3: Check DTC memory" Diagnostic Mode 3: Check DTC Memory
- Then select "Mode 4: Reset/erase diagnostic data".
- Display: "Diagnostic data are being erased"
DTC memory is erased.
- End diagnosis and switch ignition off.
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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.