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Discussion Starter #1
I have a e92 320d n47 from 2008 and been getting the check engine light. So I scan it with obd and I got these 2 errors:
4501 - Exhaust feedback regulation (permanent)
447B - Oxygen sensor (permanent)
The car is running normal, it starts normal and idles normal. What is wrong with it and what should I change? Thanks.
 

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Discussion Starter #3
So if I change the O2 sensor, will I get rid of the exhaust feedback regulation error too? I've been out of country some time and now I want to fix my cars check engine light.
 
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