Air Quality Sensor G238, checking: Notes

WARNING: This page is about a different car, the 2008 Audi S4, 2008 Audi RS 4, and 2008 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Special tools and equipment

Diagnostic Operation System VAS 5051A e.g. with Diagnostic Cable - 3 Meter VAS 5051/5A and K-Lead Adapter Vas6017B VAS 6017B (or K-Lead Adapter VAS 6017A)
Test gas "D 007 855 A2"

NOTE:

The vehicle must be standing in a clean atmosphere (away from running engines, exhaust vents, etc.).
The engine compartment and plenum chamber must be clean (not contaminated with oil or fuel).
The engine compartment and plenum chamber must not have been sprayed with cleaning agents or preservatives containing solvents.