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Re: P0420, cat failure & rear O2 Re: 05 Focus
Posted to Technical Theory Forum on 4/28/2006 5 Replies

Rusty,

Why not just do it the easy way and let the on board diagnostic system do it all for you? Make sure the exhaust system is air tight. Make sure the engine is in a good state of tune (oh now I hate that word). Make sure the engine is in good fuel contro... Login to read more.

5 Replies Received (View Replies)