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Those codes could be from no power to the coil or the computer is not firing the coil. Need to check the coil for power to it on cylinder 1,2,3,4,
Hello Steve. Is this something that would happen suddenly? Is the power feed different for the other 4 coils?
Check the red wire at the coil connector, do you have battery voltage with the key on?
It is odd the whole one side is bad it could be the power to the coil they are all feed by one wire to the coils.
Ok, I will get my meter and get started. If there is no voltage, would the culprit be the harness or the computer?
Ii would be in the wiring harness if you have no power. If you do have power then it could be the computer
Thanks. I will get back to you.
I checked the coils and they all have power. I started the engine and it is running smooth. The codes are gone. I'm afraid to drive it because it is so intermittent. Any sugguestions?
Then that sounds like the computer is going to need to be replaced.
The computer fires the coil on plugs and the part of the computer that fires them is not working intermittently, Unfortunately you are going to need to replace the computer. To resolve your concern.