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 DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - TESTS W/CODES - INTRODUCTIONPCM REPLACINGCABRIOLET
1998 Audi A4 Avant Quattro, Automatic
Pcm Replacing: Cabriolet
1998 Audi A4 Avant Quattro, AutomaticSECTION Cabriolet
- PCM is located in floor cavity, under carpet on passenger side of vehicle. Code PCM. See PCM CODING . After coding PCM, verify no DTCs are stored in 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 specific values to zero. To generate a readiness code, a mixed city and highway drive cycle must be performed. Vehicle must travel for 1.5-5 minutes at speeds of 50-63 MPH (with a 5-8 second deceleration) with manual transmission in 4th or 5th gear or automatic transmission shift lever in 4th position.
- If vehicle altitude is 5906 feet or more, a readiness code cannot be generated until vehicle is taken to a lower altitude. 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.