error p0420 on my 147 1.6TS - Alfa Romeo Forum
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Hmmm error p0420 on my 147 1.6TS

Hi all,

I bought my first Alfa just a few months ago, it's a 2002 147 1.6TS.
It has 100,000 km on clock. Everything seems to work OK, but i get occassional "MOTOR CONTROL SYSTEM FAILURE" messages that stay on until they are deleted on diagnostics. This happened 3 times already, and every time it was p0420 - catalytic converter 1, low efficiency. I took the car for an emission tests, it passed and the guys said the cat is working fine My dealer however insists that the cat is broken and wants to replace it for a high price ($1300) Any ideas on what I may want to check first ??
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Re: error p0420 on my 147 1.6TS

If it's not the cat it's the lambda sensor.
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