ADT Cheat Sheet 2026

The 30 highest-yield ADT facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. What is peer review in ADT Advanced Diagnostics & Troubleshooting? → Quality evaluation by qualified colleagues for improvement
2. During an Audi S4 3.0 TFSI oil consumption test, how many miles must the vehicle be driven before re-checking oil level per Audi's approved procedure? → 1,000 miles
3. What is the purpose of the 'terminal 30' in Audi's standardized wiring terminal designations? → Permanent battery positive supply
4. Which Audi-approved engine oil specification is required for vehicles equipped with a DPF (Diesel Particulate Filter)? → VW 504 00 / 507 00
5. An Audi 3.0 TFSI supercharged engine shows a P0234 code (turbocharger/supercharger overboost condition). What is the MOST likely first diagnostic step? → Check bypass valve operation and vacuum/electrical actuation
6. What is the purpose of the lambda (oxygen) sensor? → Monitors air-fuel ratio in exhaust
7. How does Audi's keyless entry system enhance comfort? → Allows entry without key use
8. When an Audi's catalytic converter is contaminated by coolant intrusion, which exhaust gas reading changes most dramatically on a 4-gas analyzer? → CO2 drops significantly
9. What is the legally mandated maximum allowable venting of HFC-134a refrigerant during Audi A/C service under EPA Section 609? → No venting is permitted; all refrigerant must be recovered
10. In Audi's FlexRay bus system, what advantage does it have over CAN bus for chassis control applications? → Deterministic timing and higher bandwidth (up to 10 Mbps) for safety-critical systems
11. What are consequences of non-compliance in ADT practice? → Fines, license revocation, legal liability, and reputation damage
12. What is the primary reason Audi recommends low-SAPS (Sulfated Ash, Phosphorus, Sulfur) engine oil in TDI engines equipped with DPF? → To prevent ash accumulation in the DPF that cannot be burned off during regeneration
13. Which Audi diagnostic concept allows multiple ECUs to be updated in a single automated sequence without technician intervention between each module? → Campaign/guided fault finding with batch SVM codes
14. What ODIS adaptation channel is used to reset the long-term shift adaptation data on a ZF 8HP automatic transmission in an Audi? → Channel 1 — Transmission Long Adaptation Reset
15. Which VCDS adaptation channel is used to reset the DPF learned values (ash content/soot mass) on VAG TDI engines after filter replacement? → Channel 044 — DPF basic settings
16. In an Audi MMI system, which bus protocol is most commonly used for communication between the MMI controller and the audio amplifier? → MOST (Media Oriented Systems Transport)
17. When performing an adaptation reset on an Audi DSG (DL501) 7-speed transmission using ODIS, what must the technician do AFTER the reset procedure? → Complete the basic settings drive cycle including low-speed clutch engagement cycles
18. An Audi 4.2 FSI V8 has an oil consumption complaint. Spark plugs show oil fouling on cylinders 5-8 (bank 2) only. The most likely cause is: → Worn valve stem seals on bank 2
19. What is evidence-based practice in ADT Engine Performance & Tuning? → Integrating research evidence with expertise and client needs
20. When performing a cylinder contribution test on an Audi 3.0T supercharged engine using ODIS, which parameter indicates a weak cylinder? → RPM drop greater than 20 RPM when that cylinder is disabled
21. When using VCDS to perform a basic settings procedure on an Audi DSG (DQ250) transmission, which condition must be met before the adaptation will accept? → Engine at operating temperature, transmission in Park, all accessories off
22. What special tool is required to correctly time the high-pressure fuel pump camshaft lobe on an Audi 2.0 TFSI engine during installation? → Camshaft locking/alignment tool set specific to the EA888 engine
23. Which Audi ODIS function is required AFTER replacing a steering angle sensor to restore proper ESC operation? → Steering angle sensor calibration/basic setting
24. After replacing an Audi instrument cluster (Kombiinstrument), what coding step is mandatory to match it to the vehicle? → VIN coding and mileage transfer (odometer adaptation) via ODIS
25. In Audi's MOST (Media Oriented Systems Transport) fiber optic network, a break in the ring will cause which symptom? → Complete loss of all components connected to the MOST ring
26. An Audi technician is performing a coolant flush on a 2.0T TFSI engine. Which coolant specification is required to avoid corrosion of the aluminum components? → Blue OAT (Organic Acid Technology) G12+ or G13 coolant
27. On an Audi with Bosch ESP, a yaw rate sensor fault is stored after a minor collision. Before replacing the sensor, what should the technician verify? → The sensor mounting bracket is not bent, causing a skewed installation angle
28. Audi's Valvelift System (AVS) switches between two cam profiles. Which symptom most commonly indicates a failed AVS solenoid? → Rough idle and misfires at low RPM
29. What is the typical high-pressure fuel rail operating pressure range for Audi TFSI direct injection engines? → 50–200 bar
30. Why is documentation important in ADT technology? → It ensures knowledge transfer, troubleshooting, and operational continuity