exhaust warning light

[dood]

I have a 2009 Golf 118 tsi.
49000kms. manual gearbox
It has been running very well. A few days ago it started to idle rough, sort of a lumpy idle and you feel it's going to stall. idle revs are 750 -800 rpm.
Then I noticed that the exhaust fault light flashes at low revs then stays on when the revs pick up. there's no jerking at high revs.

Any idea what the problem is?

[bennjamin]

Do you mean the ECU light ?
It can refer to one or multiple errors recorded by various sensors all over your engine bay and beyond.....not necessarily an exhaust fault.

Get the car scanned via VCDS or at a workshop to make sure what exactly the issue is.

It could be a IAT sensor , tps , faulty ignition unit etc.

[domanski]

If the engine light is flashing its mean you have a misfiring. Possible one of four coil packs is faulty. Its not expencive. Volkswagen used to have a recall for all four coil packs replacment. Give them a quick call. you can find a faulty coil pack, if you disconect each coil pack one by one, and look for engine running change. The faulty coil pack, if disconected will not affect an engine "work".