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.
1999 Audi A8 QuattroFACTORY OEM SERVICE PROCEDURE
Coding A/C control head -E87-, beginning at index "J"
NOTE:
- For vehicles with gasoline engines, the signal "idle control on" serves the engine control module as auxiliary information. It is sent out as soon as the temperature control in the passenger compartment requires an increase in cooling or heating power.
- The compressor manufacturer "Nippondenso" has changed its name to "Denso."
- The essential differences in the coding between "Rest of the world (00080)" and "USA (00180)" or "Japan (00280)" are the following: USA - temperature indicator in ° F before ° C, smaller differences in temperature coordination. Japan - the function of the "manually switched on recirculating air" is not erased with the ignition switched off.
Factory Service Tools
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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.
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