po171 and po330 1999 Lexus es300

Question

Have codes Po171 and po330 on 1999 lexus es300.
Have done following, cleaned MAF, replaced fuel filter, 6 coils, spark plugs.

Answer 1

P0330 Knock sensor signal too low

P0171 Fuel trim lean Bank 1

When the knock sensor signal is low , the knock sensor is not producing a adequate signal for the ECM to see. The ECM sense background noise from the ECM, when there none it sets P0330. just the location of where its at it cover tends to crack apart. Just to get to the knock sensor you have to remove the intake so if there is any vacuum leaks just having to replace the intake gasket , with new ones you may just solve the lean code condition. provided that where it is coming from, This engine if it ever overheated and there is a slight combustion leak going into the radiator you would set a lean code condition not a misfire code.