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Old 12-18-2018, 11:44 PM   #8
ArmstrongRacing
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The 138 code is due to a high signal voltage from the rear O2, it would be weird for that sensor to have an issue since it never gets touched during the swap. The connector is behind the dash and the wires pass through the fuse box back to the ECM.

The 607 is strange, could be due to water ingress or corrosion, or bad connections.

I would start by looking at freeze frame data, then disconnect the battery. Then disconnect the engine harness plugs, inspect closely, then reconnect everything.
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