Leaderboard

So this isn't terribly helpful, but the only way to get a more accurate diagnosis (short of finding someone with this exact problem) is with the Emissions manual I don't have. Whether that means taking it to a shop, or buying that manual or access to its information yourself, or trying to get in contact with the previous owner to get more information about exactly how he bypassed the CEL during the EGR delete. Without the manual, all we know is that the PCM doesn't like the voltage it's seeing from the EGR system. Whether that's the fault of the EGR, the PCM, the wiring between them, or some other part of the system I'm not familiar with is anyone's guess. On a quick google, you've got this guy saying he had a bad EGR valve, but then his new aftermarket EGR valve kept throwing the CEL because even in working condition it produced out-of-spec voltages. So replacing the EGR doesn't rule out that possibility, and the only thing you can really do on your own at this point without throwing more money at it is inspect the wiring. Even if Forscan (or other OBDII live data) can show you EGR voltages, unless they're completely insane they won't mean much without the manual. Is it possible for your tech friend to help you come up with one?