Yellow warning light suggesting issue with Emissions Control

[DJH1971]

I have a 66 plate Audi A4 (B9) 2.0 TFSI S-Tronic.

I noticed that my oil level was getting low, so I added some motor oil and was the right grade in question.

I added about half a litre, or slightly less than that.

Then I waited a few minutes for the oil to go down.

However, when I started up the engine felt it was knocking so took it for a short drive and felt fine whilst on the move.

When I came back and parted on my drive, a yellow light indicating a problem with the emission control system came on.

Can this problem be rectified and just hope I've not do some serious damage?

Edited by DJH1971 on Sunday 4th January 15:31

[Panamax]

It's possible to get EML illuminated if the oil filler cap isn't on tight.

Oil level indicated - was that on a dipstick or on the dash? Half a litre shouldn't do any harm to anything unless the system was already full and the indicator was faulty. With a serious overfill the crank can whip the oil into foam which is a bad thing.

[DJH1971]

Panamax said:

It's possible to get EML illuminated if the oil filler cap isn't on tight.

Oil level indicated - was that on a dipstick or on the dash? Half a litre shouldn't do any harm to anything unless the system was already full and the indicator was faulty. With a serious overfill the crank can whip the oil into foam which is a bad thing.

It was on the dash as this car does not have a dipstick and it was showing the level as getting close to the minimum. The oil capacity for this car apparently is 5.2 litres. I used 0W-20 grade which according to Halfords was the recommended grade for this car. I certainly didn't have this issue before I added the oil so something is amiss here because of this.

Edited by DJH1971 on Sunday 4th January 16:46