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Stock JK TechBulletin board forum regarding issues with OE (original equipment) components of the Jeep JK Wrangler (Rubicon, Sahara, Unlimited and X) such as factory suspension parts, engine, transmission, body parts, interior fixtures and the on-board computer.
What year is it? Also, I think a faulty vacuum line can also give codes for bad egr. This happened on my daughters Mitsubishi eclipse. I found a hole in a vacuum line. Replaced it and the code went away.