Mostcars have this warning light. The airbag will only deploy if there is enough weight on the passenger seat to activate the sensor. For many cars that weight is 65 pounds or30 kg. It is recommended that passengers less than that weight travel in the back seat. If the warning does not go off with a heavier passenger or other stuff on the seat Thecheck engine light is part of every vehicle that has an electronic engine management system, either an integral one or only for fuel ignition. Its function is to alert the driver about any type of engine problems. While driving, the computer of your A3 e-tron (ECU o PCM) monitors air/fuel supply and exhaust gases in order to verify that the Step1 – Disconnect the battery cables. Pull the hood release lever by your driver's side kick panel. Pop open the hood and locate the battery box. On most Audi models, this is in the center of the cowling. Unclip the lid to the box and you should see the battery with two cables going to it. Viewall 20 consumer vehicle reviews for the Used 2016 Audi A3 Sportback e-tron on Edmunds, or submit your own review of the 2016 A3 Sportback e-tron. Usingthe latest Audi diagnostics tool, named Odis, we were able to connect to the Audi’s brain to find the root cause of the battery warning message. With this scan, the diagnostic came up with the trouble code B1802F1, indicating a fault in the energy management system. The A3 that was brought to us was also a hybrid model. Thisarticle applies to the Audi A3 (2012-Present). The check engine light is designed to let the driver know when there is a problem somewhere in the vehicle, whether it be a worn part that needs Themost common problems for the 2016 Audi A6 are improper deployment of the passenger airbag, overheating of the auxiliary heat connector, and improperly-welded fuel rails. The Most Common 2018 Audi A3 e-Tron Problems. The Most Common 2010 Audi Q5 Problems. Refresh Articles. ByJames Mills. Extended test: 2016 Audi A3 Sportback e-tron. Time to plug n' play. AS THE resident country bumpkin of the Driving team, I’ve been elected to run Mr31.