My engine light came on yesterday.
P0171 error code stem to leen.
Is this a common fault?

Hi All,

Been a long time since I've been on here . But looking for some advice if possible.

Cut a long story short about a month ago I had performance issues with my Astra J 1.6 2010 with it having dead spots in acceleration and occasionally cutting out when idle. Hooked it up to an simple OBD reader and errors all pointing to a faulty O2 sensor bank 1. So I purchased a replacement from euro car spares (no Bosch in stock at the time but the next one that was recommended was a FAE branded

I have a 2013 Astra 1.4i and the EML light is constantly on, the garage has reset the light but it immediately comes back on and also gives the code P0171.
[color=#383a3b][font=Inter, Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', sans-serif]also when the car starts the fan switches on straight away. I have found some info about a PCV sensor or