Lexus rx300 have very common problems with mass air flow sensor (system too lean), knock sensors, and vvt solenoids (low/dirty oil). If replacing knock sensor, MUST USE oem sensor only, 4 hours labor.
Aftermarket vvt solenoid $140 a piece.
Oem knock sensor $280 a piece.
Labor for knock sensor replace 5 hours - $750. Total for everything for knock sensor only around $1,500.
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