legacy603 Posted March 3, 2015 Share Posted March 3, 2015 Code p0420 and a flashing cruse light new car still learning the ins and outs any help would be great thanks Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted March 3, 2015 Share Posted March 3, 2015 Lots of causes to this. First make sure spark plugs, wires (turbo may be coil-on-plug), air and fuel filters, and PCV valve are all new. Next, get a scanner or look into getting a program like Romraider so you can watch and record live data. Read through some of Cardocs P0420 diagnostic thread on SubaruOutback.org. Tons of info there about those code and what can cause it. But the key to diagnosis is to find out what the computer is seeing from sensor inputs and how it's responding by altering fuel trim. Quote Link to comment Share on other sites More sharing options...
legacy603 Posted March 3, 2015 Author Share Posted March 3, 2015 Alright thanks a little more work then I thought Quote Link to comment Share on other sites More sharing options...
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