VW Emissions Control & Environmental Compliance 4

Question 1

A VW technician measures EGR flow on a 2.0 TDI and finds it 30% lower than expected. Which component failure would cause this WITHOUT setting a dedicated EGR DTC?

Accepted Answer

Carbon-clogged EGR cooler reducing flow volume while valve position sensor reads correctly

Answer

A coked EGR cooler reduces actual gas flow even when the valve position sensor reports correct valve lift, so no position-based DTC sets.

Question 2

Under the VW Settlement consent decree, which of the following was a required remedy for affected 2.0L TDI Gen 1 vehicles?

Accepted Answer

Either buyback/trade-in or an approved emissions modification that brought vehicles into EPA compliance

Answer

The 2016 VW Settlement offered owners either a buyback/trade-in or an approved emissions modification, with VW required to remediate the illegal defeat device.

Question 3

What does a 'readiness monitor incomplete' status for the Comprehensive Component Monitor (CCM) indicate on a VW vehicle presented for I/M testing?

Accepted Answer

A component monitored by continuous OBD checks has not yet passed its self-test in the current driving cycle history

Answer

The CCM monitors components continuously; an incomplete status means the ECM has not yet confirmed passing status for at least one CCM-covered component.

Question 4

When replacing a VW refrigerant recovery machine filter drier after contaminated refrigerant recovery, which EPA requirement must be met?

Accepted Answer

Contaminated refrigerant must be sent to a reclaimer certified to SAE J1990/ARI 700 standards

Answer

EPA Section 608 prohibits venting and requires contaminated refrigerant to be sent to an approved reclaimer meeting ARI 700 purity standards.

Question 5

A VW Tiguan with a 2.0 TSI shows high CO at idle during an I/M test. Short-term fuel trim (STFT) is -15% and long-term fuel trim (LTFT) is -12%. What is the MOST likely root cause?

Accepted Answer

Rich running condition due to a leaking fuel pressure regulator or stuck-open injector

Answer

Negative fuel trims indicate the ECM is pulling fuel because the engine is running rich; a leaking injector or failed pressure regulator is a common mechanical cause.

(VW) Volkswagen Certified Technicians Practice Test

(VW) Volkswagen Certified Technicians Practice Test

VW Emissions Control & Environmental Compliance 4