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Discussion Starter #1
Stock ECU PN: 8D0 907 557 P
Tuned ECU PN: 8D0 907 557 N

Is this a problem? Check engine light comes on with tuned ecu, goes off with stock. Engine codes: p1613;Transmission control module, short to B+
p0134; Oxygen sensor circuit - no activity detected (pre-converter senosr, bank 1)
What is "short to B+?
Why does one ECU have no activity at pre-converter, and the other one is fine?
 

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Discussion Starter #2
anyone have experience in this matter? What makes one ECU fine, and the other trip the CEL?
 

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I think the problem is the P is for quattro, and the N is for non-quattro. Is there anyone here that can verify that? I'm having trouble finding sites that sell the ECU. Any help will be greatly appreciated.
 

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Discussion Starter #4
nope, I was wrong. Further research shows the Passat using 8D0 907 557 P. Maybe the N is for the tiptronic?
 
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