: For many 178‑series codes, you can use the Output Tests function (03) to activate components like the EVAP purge valve or EGR valve and verify their operation.
While "178" alone is not a DTC (Diagnostic Trouble Code), it is part of the code, also known as P1473 . This is a specific and recognizable fault in older 1.8T engines found in many Volkswagen and Audi models. This is one of the most common instances where "178" appears in an error code search. vcds 178
: Quickly diagnosing complex dash warnings like "Error Brakes workshop" or "Button for drivers assistance system faulty". : For many 178‑series codes, you can use