Hi folks, I am new here. Just bought a 2002 Deville 4.6L engine with 70,000 on it this past Friday. Drove it from Dallas to Ralls, Texas. About 185 miles out from Dallas the Service Engine Soon light came on. I completed the trip without any problems. Car ran beautiful all the way home. No problems. I pulled the code today - and it was IPM BO 429. Anyone know what this is? Hope it isn't costly.