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You need a VCDS scan too see what the MAF is saying and also O2 sensors and what cylinder the misfires are coming from. Try unplugging your MAF sensor first it could be sending dodgy info to ECU. If no change then do the thing below. stand at the back of the car when starting it and see wait...

Does VCDS say anything as I dont think mine did as it thought it was genuinely short of oil Worth a punt on another cheap sensor, mine has been ok for 2 1/2 years now

I also have ASN and previously had random oil low message on DIS, I also changed the sensor (£5 china job) fixed the fault. Usually came on after about 30 miles open bonnet close bonnet and would go away and then randomly come back on. when I had a sensor fault it didnt come up on the DIS...

If you search there are hundreds of posts about the issue. It isnt just a case of powering up the rear amp via the blue wire which kicks in your rear speakers, you need to know what voltage is coming off that wire. check this vid out, see if it helps...

I think I am right, as it is what I did. If you have pre outs with your new stereo connect them to this it will kick in the rear amp and your rear speakers...

Have you manually opened the roof all the way and then closed it, that should reset the sensors unless there is an actual fault. Have you got the special roof key to unlock the front and rear catches (drivers side panel where fuses are kept)

My ASN has been having this for 4 years and hasnt missed a heartbeat, change every 6000 miles currently £35 for 20L Says longlife but is 502 and 505 compatiable which is normal servicing 20L Mannol Premium 5w30 Fully Synthetic Long Life Engine Oil Low Saps C3 SN/CF...

So what are your problems ?

My initial thoughts last Month when it first started was the B1 pre cat sensor but because it is acting the same as the B2 pre cat sensor (where there isn't a problem) I dismissed it. I have managed to buy a new bosch pre cat sensor and the other option after reading up is to check the exit of...

That is exactly what i have done, although my results in regards to emissions are sligtly lower in 60’s instead of 90’s. I got cat 1 not ok also, then MOT passes with <.30% = 0.01 emissions. Only thing I can think of is that he measured it against a very high threshold limit.

Thanks Callum, the fuel trim on both banks is between -1 and -2 which in my mind says there isnt any extra air getting in (manifold or otherwise) even if there was the cat should still deal with it.

Audi Cab 3.0 V6 Engine light coming on caused by: 16805 - Warm Up Catalyst; Bank 1 P0421 - 001 - Efficiency Below Threshold - MIL ON My VCDS states: B1S1 is fine pre-cat sensor jumping between 0.1v-0.9v (lean to rich) as it should. B1S2 is also jumping around but it...

On vagcom under engine measuring blocks it should tell you when you are pressing the stalk and button whether it is seeing it or not. Check the coding is still correct for cruise also on steering module http://wiki.ross-tech.com/wiki/index.php/Audi_A4_(8E)_Steering_Wheel...

Tells you what voltage the battery currently is, even if says 12v doesnt mean your battery is in good shape as the cold cramping amps could be ***** but gives you a bit of a heads up. Handy for checking if your alternator is healthy kicking 14v+ when car running

Could it be the wiring to the sensor, does the warning stay on the DIS or come and go ? If the leval sensor triggers and you turn engine off and back on does the warning go away, if not does the warning go away if you open and close the bonnet (it assumes you have put more oil in)

Not exactly what you want but a good read. https://www.audizine.com/forum/showthread.php/138299-B7-Multi-Function-Steering-Wheel-into-2002-Audi-24

Bit more of an explanation needed, have you tried to link keys to the car ? Have the batteries ran out ? If its the innards of the keyfob that arent working then buy a replacement off ebay and swop key blade and immob chip a lot cheaper. Lock the car from outside with the key in lock then...

I also have 3.0 V6 and had YELLOW oil level fault, RED is the more serious oil pressure. Mine usually came up after 50 miles, if you know your oil is fine open the bonnet and close it and it goes away as it assumes you have put more oil in. Mine was at 80k when it became dodgy I replaced it and...

There are many generic considerations and some specific to S4, some off the top of my head Deffo check all wheel arches as they are a weak point in regards to rust when was the timing chain (tensioners) last looked at How much does the engine rattle when started from cold (If cab) check radio...