Greenbatman

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Thanks for your advice. I'll give that a try. Very frustrating.

Disconnected knock sensor and the pinging stopped? I have a 2006 Impreza EJ201 that has been pinging under load and up hill once it has warmed up. Been running 98 octane fuel and performed upper engine clean but still pings. Disconnected knock sensor and all pinging has stopped. Does this mean the knock sensor was faulty and making my car ping?

Can anyone tell me if I can test the Egr valve operation by connecting the green connectors and putting in cycle mode