Please help new faults

Hi all, left the house and the car started misfiring.
stuck it on VCDS which threw up these codes:

4 Faults Found:

16804 - Catalyst System: Bank 1: Efficiency Below Threshold

P0420 -- 001 -- Upper Limit Exceeded

17771 - Cylinder 3 Ignition Circuit: Short Circuit to Ground

P1363 -- 001 -- Upper Limit Exceeded

16697 - Misfire(s) Detected: Reason: Lack of Fuel

P0313 -- 001 -- Upper Limit Exceeded

16691 - Cylinder 7 Misfire Detected

P0307 -- 001 -- Upper Limit Exceeded


I know what the problem is with the first one (o2 sensor) but what about the rest?

thanks Tony

A4 2.0 SE 2001

What is your engine code?

How can you have cylinder 7 misfire on a 4-cylinder car?

Quote:

---

Originally Posted by Crasher

What is your engine code?

How can you have cylinder 7 misfire on a 4-cylinder car?

---

where would I find the engine code?
and I have no idea why cylinder 7 on a 4 cylinder car:confused:

however I have cleared all the codes and although not as responsive, it does run without the Engine management light flashing and isn't misfiring or not that I can tell?

thanks Tony

if the misfire counter is haywire (random cylinders and counting up very quickly) then check fuel pressure and check the cats for partial collapse.
Remove a lambda probe that's accessible and see if there is any greyish powder in the exhaust