ODB Error Code P0171

[azaman]

So I've had then engine check light on for a few weeks now, though the car seems to run ok. I bought a USB ODB2 scanner from Ebay (great seller and product btw - if anyone is interested in buying let me know) and read the fault code.

This is what I got back:

P0171 System too Lean (Bank 1)

Having done some research, first port of call is to clean the MAF and then replace the MAF if that doesn't work. Some say it could be an oxygen sensor, though the general consensus online seems to be to check the MAF first.

Does anyone have any thoughts on this? Just wondering if I am barking up the wrong tree here.

 

[EdmundIJones]

I had that on my VW golf a lot and that was the MAF... then again any error on Golfs point ot the MAF normally.

 

[BlackC55]

There is a breather pipe under the air filter housing that splits and causes this type of fault code. Remove the housing and take a look

 

[azaman]

Did a little more searching and BlackC55's diagnosis may also be correct. This seems to be a fairly common issue.