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 MANUALSAUDI1998A4 AVANT QUATTRO, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - TESTS W/CODES - INTRODUCTIONPCM REPLACINGA4
1998 Audi A4 Avant Quattro, Automatic
Pcm Replacing: A4
1998 Audi A4 Avant Quattro, AutomaticSECTION A4
- PCM is located in left rear corner of engine compartment inside electronics box. Code PCM. See PCM CODING . After coding PCM, verify no DTCs are stored in memory. Ensure throttle valve is in closed throttle position.
- Connect VAG 1551 scan tool to Data Link Connector (DLC). Following manufacturer's instructions, access Basic Setting 60 information using VAG 1551 scan tool. After confirming correct VAG 1551 scan tool display, "adaptation" will begin with ignition on and engine off.
- PCM will learn the closed throttle position, Wide Open Throttle (WOT), and other positions of throttle valve control module. PCM will store these values in permanent memory. Vehicle may idle unevenly and there may be a temporary loss of driveability until PCM has completed a learning process. PCM will not complete learn function if a DTC is stored in memory.
- Using VAG 1551, generate a PCM readiness code. A PCM readiness code resets 8 specific values to zero. Follow scan tool prompts for generating a PCM readiness code.
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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.