I forgot to update this before, but for posterity, the third mechanic appointment fixed the problem, which was a wire coming loose after driving around for a bit. Thus, the order of events was:
1. During initial installation, a fuse and a fuel temperature sensor were blown. RRP eventually seemed to be installed correctly. MIL resulted.
2. Temperature sensor was replaced, but a wire was not securely fastened. MIL was cleared.
3. Insecure wire came loose after some driving around. MIL returned.
4. Wire was securely attached. MIL has been clear for thousands of kms.
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