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Q:

my 1994 sc 400 has a51,52 code which means bad knock sensors, i relaced them! on 1994 Lexus SC400

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i replaced both knock sensors and that did nothing to help the problem,i lost $400.00,plus labor,i had the computer re done,for $300.00, that didn't help either'i had the wiring traced and tested,they were fine,car still reads code 51 and 52,bad knock sensors,no power, it ideals up and down, can some one tell me what the problem is?
(1) Answer
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It is not usually the sensors that fail but the electric harness that gets brittle with heat cycling or rodents eat the harness.