AUDI Vehicle Diagnostics 3

Question 1

An Audi technician notices a P0171 (system too lean, bank 1) code. Which sensor failure would LEAST likely cause this code?

Accepted Answer

Oxygen sensor stuck rich

Answer

An oxygen sensor stuck in a rich reading would cause the ECU to add fuel, potentially resulting in a rich condition, not a lean fault code.

Question 2

During an Audi EVAP system diagnosis, a technician performs a smoke test and finds no visible leak. What is the next recommended step?

Accepted Answer

Check the vent valve and purge valve operation with a scan tool

Answer

If a smoke test reveals no physical leak, the vent valve or purge valve may be malfunctioning electrically, which can be verified with actuator tests on a scan tool.

Question 3

On an Audi with Haldex AWD (used in Q3/TT), which condition would cause the system to default to front-wheel drive only?

Accepted Answer

Haldex oil pump failure or low fluid level

Answer

The Haldex unit relies on an electric oil pump to pre-fill the clutch pack; pump failure or low fluid causes the system to default to FWD mode.

Question 4

A technician is diagnosing an Audi with a faulty variable valve timing (VVT) solenoid. Which symptom would be MOST consistent with this fault?

Accepted Answer

Poor fuel economy and rough idle at all temperatures

Answer

A failed VVT solenoid prevents proper camshaft phasing, leading to rough idle and reduced fuel efficiency across all operating temperatures.

Question 5

When using ODIS-E to diagnose an Audi SRS airbag fault, the technician finds a stored code for high resistance in the driver's airbag squib circuit. What is the correct diagnostic approach?

Accepted Answer

Measure resistance of the squib circuit with the airbag disconnected using a dedicated squib resistance tool

Answer

A dedicated squib resistance tool measures the circuit without risking accidental deployment, safely identifying whether the fault is in the wiring or the squib itself.

(AUDI) Audi Certified Mechanic Practice Test

(AUDI) Audi Certified Mechanic Practice Test

AUDI Vehicle Diagnostics 3