07 lexus rx 350 with check engine light code p0304

You need to replace your ignition or engine coil for one of your cylinders. It is equivalent to a mini tuneup in the old days. You need to replace your ignition or engine coil for one of your cylinders. It is equivalent to a mini tuneup in the old days.

I had the exact same problem. code was coming up for the coil in cylinder 4, swapped it to cylinder 6, code moved to 6. Replaced the coil and all was fine. (Note: I put the new coil in cylinder 6) Until 8 months later. Engine light came on after minor rumble in vehicle, same as before. Code came up again in clylinder four, swapped 2 and 4, light came back on and code moved to cylinder 2. So something is causing the coils in cylinder 4 to blow. Does this make sense or do you think it is coincidence that both coils went after being in cylinder four. I had the exact same problem. code was coming up for the coil in cylinder 4, swapped it to cylinder 6, code moved to 6. Replaced the coil and all was fine. (Note: I put the new coil in cylinder 6) Until 8 months later. Engine light came on after minor rumble in vehicle, same as before. Code came up again in clylinder four, swapped 2 and 4, light came back on and code moved to cylinder 2. So something is causing the coils in cylinder 4 to blow. Does this make sense or do you think it is coincidence that both coils went after being in cylinder four.