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P0170 code

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Hi all, looking for help regarding my daughters boyfriends Zafira 1.8 Elegance. 

It has had a fault code come up, P0170, fuel trim malfunction.  On doing some research, I found that it's a mixture problem. Either too rich, or to lean. What is needed to cure this problem please. Its very erratic on tick over, and  when you rev it, the revs are slow to die down. 

Could the code be the cause. Any advice would be much appreciated.  I'm more Astra than zafira.  But the owner knows even less.

TIA  Andy. 

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  • 2 weeks later...

An update on this fault. It turns out that both O2 sensors needed replacing. Car had a full system check, and only fault that could be found was Lambda sensors (o2). So 2 new ones purchased and now been fitted. 

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