Good old Motor control system failure but with error p0430 - Alfa Romeo Forum
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Location: United Kingdom
County: Kent
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Good old Motor control system failure but with error p0430

Morning all,

My enginecheck software has informed me this morning that I have error code P0430 which is 'Catalyst System Efficiency Below Threshold (Bank 2)'. Now I at that point thought knackered CAT, and it appears that looks to be true when I checked on my PC.

However, does anyone have any thoughts on whether it might just be the sensor that's dodgy??
Mind you saying that I think the CAT probably is dead, my 156 JTS has done 104k now and it does make a rattle as I re-engage the throttle after changing gear. Its definatley an exhaust rattle and it is coming from upfront. I have already had: a new exhaust bracket for the flexy pipe, new flexy pipe, new (second hand) secondary cat, second hand centre box and a raggazon SS back box. In fact its only the Main Cat that is original!!

Also if I did buy a aftermarket CAT for 270 are they OK, or is it the sort that gonna give me error codes even though they it would be new!!!!

Cheers in advance,


Location: Gravesend, Kent
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