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My engine light came on we took it to dealer and it had code P0300/302 (cylinder misfire). The dealer said the grounds were not right and cleaned them. Light came back on with same code.
Now code is P050a P050e (cold start) Took to dealer again and they said they have to reprogram the ecm.
Does anybody now anything about this cold start reprograming?
How long does it take and what else do they have to do?(test drive how long, etc). Please help me!!!!
 

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Sorry haven't heard of this, perhaps others have, but doesn't sound like common issue. Fortunately this should be 100% covered by Nissan powertrain warranty.
Cold starting is different from hot starting cuz the air and fuel mixture is different for each ie. more fuel when cold starting. This is governed by the computer/ecm i believe.
I'm not a mechanic, just my 2c
 
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