HawkSTI Posted September 20, 2017 Share Posted September 20, 2017 I keep getting an eml thrown up. The code I'm getting is P0420 "catalyst system efficiency below threshold (bank 1)" any one else had this or know exactly what it means? 🤔 Quote Link to comment Share on other sites More sharing options...
mattiekane Posted September 20, 2017 Share Posted September 20, 2017 I believe that's triggered if the pre and post cat O2 sensors reading are similar(cat appears to not be doing it's job)Sent from my HTC One M9 using Tapatalk Quote Link to comment Share on other sites More sharing options...
HawkSTI Posted September 20, 2017 Author Share Posted September 20, 2017 7 minutes ago, mattiekane said: I believe that's triggered if the pre and post cat O2 sensors reading are similar(cat appears to not be doing it's job) Sent from my HTC One M9 using Tapatalk There's one in the downpipe and one between the downpipe and centre section on the hawks I think. Any way of telling which one needs replacing? Quote Link to comment Share on other sites More sharing options...
mattiekane Posted September 20, 2017 Share Posted September 20, 2017 What are you using to code read?Sent from my HTC One M9 using Tapatalk Quote Link to comment Share on other sites More sharing options...
mattiekane Posted September 20, 2017 Share Posted September 20, 2017 https://allwheeldriveauto.com/subaru-check-engine-light-and-code-p0420-explained/Sent from my HTC One M9 using Tapatalk Quote Link to comment Share on other sites More sharing options...
HawkSTI Posted September 20, 2017 Author Share Posted September 20, 2017 @mattiekane torque pro 👍 Quote Link to comment Share on other sites More sharing options...
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