Peculiar P1646 problem
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Interestingly, my 01 threw a 1646 when I bought it. Diagnosed a front right side O2 sensor, replaced it and the code persisted until I found this same info about the later AJ27 cars as is in this thread. Pulled both fuel pump relays, shunted the appropriate pins to run the pumps and verified they both were operating and then replaced the relays, code vanished and has not reappeared since, this was about 35,000 miles ago.
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Jeroen (03-06-2024)
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