VXOC Astra-J/GTC

Full Version: 1.4 non turbo P0171 code
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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.
also when the car starts the fan switches on straight away. I have found some info about a PCV sensor or something? I took the oil cap off and its filled with gunk.
any help would be greatly appreciated.
There maybe 2 more digits for that error code which can help narrow down a little bit more.

When you say gunk are you meaning a white/greyish mayo looking gunk?

Have you had a header tank test done?