If you have a Toyota vehicle (in this case a 2007 Camry) with a V6 2GR-FE engine and have a check engine light on with code P0356 Ignition Coil "F" Primary Secondary Circuit set in the ECU, then replace the coil with a genuine Denso brand coil. Failure to use a Denso Brand coil will cause you drive-ability issues down the road. Denso 673-1309 Ignition Coil You may have other codes stored also like, P0300, P0301-P0306. This is due to the fact that when one cylinder exhibits a misfire issue, it can cause the crankshaft sensor to "see" a irregular waveform from the crankshaft revolution and the ECM interprets this a multiple misfires when in fact there aren't any. This is what we call bleed-over. Basically when one cylinders misfire reading bleeds over into the others. The main clue is the P0356 code. It is telling you that the Primary/Secondary Coil Winding Circuit is faulty. Toyota also got into labeling engine cylinders 1-6 coils A through F. So Cylinder #1,3 and 5 is Coils A,B and C Cylinders #2,4 and 6 is Coils D,E and F
