Hello, I'm new here, and i'll finish my bio l bit later. I have a fault code, from what i gather its a lean condition due to ritch over correction. its a code 51. the engine still runs like its brand new, and that no exageration. it idles at 550 rpms and ultra smooth, it performs very well all the way up to 5000 rpms. the only thing that i've changed on my car is that i've done an EGR delet about 2 weeks ago, and it ony threw the code the day before yesterday. i was told that teh EGR delet could have caused this reading, also i have changed the rear O2's and may have plugged them into the wrong sides of the wire harness. i was also told that if they were plugged in wrong that it would send the wrong signals to .. i dunno. i was told that may ahve caused it too. do you guys have any ideas?