Kerry,

Good work in finding the problem. Just so you know, the EGR system can indeed effect pinging if it is right on the edge. To oversimplify, EGR leans it out, which if the conditions or on the edge of pinging, the pinging could then develop.

Now that you have the timing set, the EGR code could be considered a nuisance code, but it would be best to run it down and fix it. Fixing it might allow you to add a little timing which would help performance and fuel economy.

Hope this is useful.

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2001 SLK 320 six speed manual
2014 Porsche Cayenne six speed manual

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