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Update: it seems that the D17A1 engine didn't have an EGR system on motors built 2002 or earlier. What seems likely then is that when this motor was replaced about 40k miles ago that I got a 2003 or newer D17A1 that have the EGR system included. However, the wiring harness and ecu (that's the computer, right?) We're never replaced to support the new motor. Hence my lack of error codes.
Is it worth the trouble to replace both the engine harness and the ecu?
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