A code 71 seems isolated to Cali-smog equipped systems from what I have seen so far. The Cali-equipped EGRs have an EGR gas temp sensor mounted in the top where it bolts into the back of the plenum. Im not sure of the test procedures since the only Toy in our stable with it is the 89' Celica with 3S-FE. But when it threw a code 71 I simply unplugged the electrical connector cleaned up the contacts...then hit the main body of the EGR assembly with a BFH for GPs and that seemed to fix the problem (albeit serious backwoods mechanics <img src="/forums/images/graemlins/notooth.gif" alt="" />) Check that out before you go and spend the coin on a new EGR...they are expensive enough that you may have to visit Toyota Financing for a new one. ~Darin <img src="/forums/images/graemlins/baby.gif" alt="" />