Multiple fault codes - Alfa Romeo Forum
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(Post Link) post #1 of 2 Old 23-02-10 Thread Starter
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Location: United Kingdom
County: Derbyshire
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Multiple fault codes

Hi all

Had the engine warning pop up on my 52 plate 156 JTS sele.

Popped the code reader on and got the following fault codes:

P0420 Catalytic converter efficiency
P0300 Random/Multiple misfire
P0301 Cylinder 1 misfire
P0304 Cylinder 4 misfire
P0560 System Voltage
P0130 02 sensor malfuction

The cat efficiency I have had before a few times, when cleared it seems to stay off for about six months then re-appear so I suspect the cat is on its way but no too bad yet.

The others I have not seen before, the car runs fine, seems to have full power and run quite nicely. I cleared the codes and drove 100 miles this morning without any issues and the engine warning is still off.

Should I be concerned and if so what preventative measures would you recommend?



Got my laptop talking to my ECU!

PM me if you want faultcodes found/cleared and are in derbyshire!
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County: Perth and Kinross
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Member car:


Possibly all/most pointing to a battery in a poor state (weather-related?).
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