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 MANUALSAUDI2005A4 BASE, 4D SEDAN, 3.0 TREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEM1.8L - ENGINE CONTROLS - ON BOARD DIAGNOSTIC (OBD) ENGINE CODE(S): AMBON BOARD DIAGNOSTIC (OBD)READINESS CODEREADINESS CODE, READINGTEST SEQUENCE

2005 Audi A4 Base, 4D Sedan, 3.0 T

Test sequence

2005 Audi A4 Base, 4D Sedan, 3.0 TSECTION Test sequence

Connect vehicle diagnostic, testing and information system VAS 5051. Go to VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM, CONNECTING AND SELECTING FUNCTIONS . Select vehicle system "01 - Engine electronics" in selection.

Engine must be run at idle.

Display on VAS 5051:

Fig 1: Displaying On VAS 5051 - Reading Readiness Code (1 Of 3)

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Under -1- select diagnostic function "08 - Read measured value block".

Display on VAS 5051:

Fig 2: Displaying On VAS 5051 - Reading Readiness Code (2 Of 3)

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1 - Enter display group

Enter "086" for "display group number 086" in zone -2- and confirm entry by pressing -Q- button.

Display on VAS 5051:

Fig 3: Displaying On VAS 5051 - Reading Readiness Code (3 Of 3)

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Check indication in display field -1-.
Check readiness code in display zone -1-.
- Specified value: 0 0 0 0 0 0 0 0

DISPLAY GROUP 086: READINESS CODE

	Display zones
	1	2	3	4
Display group 086: Readiness code
Display	0 0 0 0 0 0 0 0	X X X X X X X	X X X X X X X X X
Display	Ready bits Completed tests	Individual tests performed	Individual tests performed
Range	1 = not completed 0 = completed	1 = not completed 0 = completed	1 = not completed 0 = completed
Specified value	0 0 0 0 0 0 0 0	X X X X X X X X	X X X X X X X X
Note:	Explanation of readiness code. See Fig 4 .

Note on display zone 1:

Display zone 1 is the most important. This display indicates which system has been checked by the self-diagnosis since the last time the Diagnostic Trouble Code (DTC) memory was erased or since installation of a new control module. After erasing the Diagnostic Trouble Code (DTC) memory, all testable values are set to "1" and then to "0" after successful completion of the test.

Fig 4: Identifying Notes On Display Group 086, Display Zone 1

Courtesy of AUDI OF AMERICA, INC.

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.