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There is no such code as p0351. Its not listed in the manual at all. Did the U code come back after clearing? U code could have been generated when trying to read codes with scan tool.
Thank you for your reply
You're right! P0351 does not appear in the manual. And, this is what surprised me as well since i checked it again and again myself.
The speculation here is that since coil pack 1 is fine, maybe its connector or harness or some other electrical cable might be faulty resulting in a comm. bus error and ignition pack 1 not responding properly.
This is pure speculation. I might be totally off!!
you are totally off . the issue is directly related to the communication error. you are using a scanner to pull the codes that is not fully compatible with the rx-8s pcm. its giving a false code and communication error because it is not compatible. find one that is.
swap the coils leading to trailing and see if you have any change in drivabiltiy or idle etc. next time before changingthe coil check the harness for shorts and the plug wires