AUDI Repair & Maintenance 3 — Questions and Answers
Question 1: During a DSG (DQ250) 7-speed wet clutch service, what fluid specification must be used?
- Pentosin ATF 1 LV
- Audi G 052 182 (DSG fluid) (Correct answer)
- Audi G 055 025 (Haldex fluid)
- Standard Dexron VI ATF
Correct answer: Audi G 052 182 (DSG fluid)
The DQ250 wet DSG requires Audi G 052 182 A2 fluid; incorrect fluid damages clutch packs and causes shudder.
Question 2: What is the recommended method for bleeding the cooling system on an Audi with a sealed coolant system after a coolant flush?
- Leave the cap off and idle until thermostat opens
- Use a pressurized cooling system filler and run through bleed cycles with heater on max (Correct answer)
- Squeeze upper radiator hose repeatedly while topping off
- Remove the upper bleeder screw and fill from the thermostat housing
Correct answer: Use a pressurized cooling system filler and run through bleed cycles with heater on max
Audi recommends using a pressurized filler tool and running the engine through heat cycles with climate control on max to purge air.
Question 3: An Audi with adaptive air suspension (air ride) shows the vehicle sitting low on one corner after overnight parking. What is the most likely cause?
- Failed compressor relay
- Leaking air strut bladder or solenoid valve (Correct answer)
- Low voltage to the control module
- Faulty height sensor wiring
Correct answer: Leaking air strut bladder or solenoid valve
A single-corner sag overnight points to an air leak at the strut bladder, air line, or corner solenoid valve rather than a compressor fault.
Question 4: When replacing spark plugs on an Audi 3.0T TFSI supercharged V6, why must the engine be cold before removal?
- Hot aluminum cylinder heads can strip threads as plugs are removed (Correct answer)
- The ignition coil plastic melts if the engine is warm
- Torque specs are only valid at ambient temperature
- Supercharger oil could leak if disturbed when warm
Correct answer: Hot aluminum cylinder heads can strip threads as plugs are removed
Audi's aluminum cylinder heads are prone to thread damage if spark plugs are removed while the metal is thermally expanded.
Question 5: What is the purpose of the 'basic setting' procedure performed on Audi throttle bodies after replacement or cleaning?
- It calibrates the idle air bypass valve position
- It relearns the throttle plate's fully closed and fully open stop positions (Correct answer)
- It synchronizes the throttle with the fuel injector timing
- It resets the mass airflow sensor trim values
Correct answer: It relearns the throttle plate's fully closed and fully open stop positions
The throttle body basic setting teaches the ECU the mechanical stop positions so it can accurately calculate throttle opening percentage.
Question 6: On Audi quattro models with rear Haldex coupling (FWD-based quattro), how often is the Haldex fluid typically serviced?
- Never — it is a sealed unit
- Every 40,000 miles or 4 years (Correct answer)
- Every 15,000 miles with the DSG service
- Every 100,000 miles with the transfer case
Correct answer: Every 40,000 miles or 4 years
Audi recommends Haldex fluid replacement approximately every 40,000 miles to maintain proper clutch pack engagement response.
Question 7: An Audi A6 C7 3.0 TDI develops blue smoke on startup that clears after warming up. What is the most probable cause?
- Injector return line leak
- Worn valve stem seals allowing oil to drain into combustion chamber overnight (Correct answer)
- Cracked EGR cooler contaminating intake
- Faulty turbocharger compressor seal
Correct answer: Worn valve stem seals allowing oil to drain into combustion chamber overnight
Blue smoke on cold startup that clears when warm is the classic symptom of worn valve stem seals allowing oil seepage overnight.
AUDI Repair & Maintenance 3
During a DSG (DQ250) 7-speed wet clutch service, what fluid specification must be used?