Random engine check lights

4.2 V8 40v biturbo - 450 bhp
4.2 V8 40v biturbo - 480 bhp (plus)
Post Reply
MarkPRS6
1st Gear
Posts: 86
Joined: Mon Mar 16, 2015 9:02 am

Random engine check lights

Post by MarkPRS6 » Tue Mar 17, 2015 9:39 am

My new RS6 (I only got it last week so its new to me), has a weird habit of putting the emission control warning light and/or the engine management light when you first switch on :boohoo: . If you then press the test button twice to run a test on the car's systems, you get OK come up. It doesn't do it all of the time, just occasionally. It has also displayed the red brake warning symbol but then if I follow this up with the test button, the car is fine.

I've also hooked it up to an OBD tester which reports no logged fault codes and the car seems happy enough.

Has anyone else come across this? I'm convinced there is nothing wrong with the car but its just weird. It doesn't go into limp mode or anything.

Cheers
:blackrs4:
Daytona Grey RS6 with Miltek stainless exhaust and Bilstein coilovers, magic tree air freshener.
Previous : Porsche 911 Carrera 4

bilko1
Top Gear
Posts: 1868
Joined: Fri Aug 27, 2010 12:13 am
Location: Bournemouth,Dorset, UK

Re: Random engine check lights

Post by bilko1 » Tue Mar 17, 2015 11:39 am

Welcome and FON, don't worry about the brake warning it's quite common on some cars, mine dosen't do it though. What did you scan it with? Ideally you need to use VCDS as some generic readers don't pick everything up.
Avus Avant, RNS-E mk2 with sds and Bluetooth, Milltek, Hotchkis, Bilstein, Forge, ITG, A.C.E, Wagner, FBMFSW, MTM.

User avatar
Rupert
5th Gear
Posts: 1138
Joined: Thu Jun 23, 2005 12:57 pm

Re: Random engine check lights

Post by Rupert » Tue Mar 17, 2015 11:46 am

The brake warning is possibly due to low battery voltage. I had this a couple of times years ago but only if I put the car into drive very quickly after starting it. Wait a few seconds to let the battery voltage pick up and all is fine.

MarkPRS6
1st Gear
Posts: 86
Joined: Mon Mar 16, 2015 9:02 am

Re: Random engine check lights

Post by MarkPRS6 » Thu Mar 19, 2015 1:51 pm

I'm happy to say that there has been no recurrence of this recently, so fingers crossed all is now well with The Beast.

Cheers for all replies.

:blackrs4:
Daytona Grey RS6 with Miltek stainless exhaust and Bilstein coilovers, magic tree air freshener.
Previous : Porsche 911 Carrera 4

User avatar
lswing
1st Gear
Posts: 94
Joined: Wed Oct 30, 2013 1:41 am
Location: U.S.

Re: Random engine check lights

Post by lswing » Fri Mar 20, 2015 3:15 am

Make sure to use Ross-Tech so you can see all codes and log full data. It will be very handy...
Revo Tune + extra ME7 fueling - MTM TCU - Wagners - Koni Struts - DevilSown W/M - Michelin PSS's - Hotchkis Sways - Upgraded TC/Trans - Mugello/Black/Carbon

Post Reply

Return to “RS6 / RS6 plus (C5 Typ 4B) 2002-2004”

Who is online

Users browsing this forum: No registered users and 130 guests