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The motor has been throwing codes 173 & 137 (rich bank 1 & 2). Here's what I have done so far; changed the O2 sensors changed plugs today (plugs were black on both banks except for the very tip of the plug) but light still comes on. run balance test on scanner, OK swapped ECU All of...

Code 511: PCM ROM - Circuit Malfunction; In simple terms what does this mean? Code 137: System Rich (bank 2) How do I address these issues? I have an intermittent CEL which I am guessing is being caused by code 511. I have California smog inspection so I need to fix Code 137, I...