Hey all, just got 3 new trouble codes on my 02 A4 3.0 V6 Avant. While I've had P0431 (bank 2 warm up catalyst below threshold) for a week now, today, after a cold start I got:
P0300 pd (random/multiple misfires) the pd is "pending" whatever that means
P0302 (cylinder 2 misfire)
P0305 (cylinder 5 misfire)
Is this usually the ignition coils going? Is the catalyst trouble code because of the misfirings sending unburned fuel into the exhaust?
Any help is appreciated.
CK

PS I'm 2 months out of my CPO warranty. Thank you Audi....

 

That is usally a sign of coils, however could be your timing as well. I would start with the coils, if they have not been replaced yet, do yourself a favour and change all of them!

 

I currently have ~56,000 km on my car. Its a 1.8Tq. How often should I change the coils?

Thanks,
Myron

 

You'll know when, you'll get a flashing check engine light.
I replaced the coils and the plugs on the two misfiring cylinders. The trouble code for the catalyst hasn't come back on yet. My mechanic claimed it was the o2 sensor and was eager to replace it.....