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Originally Posted by Eddie
It's true about requiring an existing programmed master key to program new keys (master or valet),valet keys cannot be used.
I have a feeling your 4Runner has the same newer immobilizer systems we use at Lexus. If so you do not have to replace the ECU,just reprogram the existing one,the dealer has to do it of course. They make a phone call to a tech line to get certain info,after which they can do the reprograming via scantool.
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Originally Posted by Eddie
So you're saying the ECU cannot be reflashed starting in 2003,including Lexus ones?
Interesting,before the '03 models we did the opposite,replace the ECU and keys. The newer models we reflash,our diagnostic tech had to reflash an IS300 when the owner lost all her master keys.
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I agree with EDDIE
This is 100% correct, the 04 runner immobilizer can be reprogrammed only at the dealer (04 runner is 1 of a few vehicles). You will have to prove ownership.
The ECU WILL NOT HAVE TO BE REPLACED, just 3 new keys cut, 2 master and 1 valet(which you have), Flash program (DEALER ONLY), then your done.
Cost = 3 master keys and labor to do it. We call this re SEED ing the ecu.
We get lots of cars from the AUTO AUCTION, which have no keys. Some we send out ecu's and some we RESEED. 04 runner is a RESEED.