P0130 code

[Pauly_ev]

Need help with my 1.8 petrol vec c

Just a quick overview: when I start the car the revs are high about 2000rpm then after a minute it seems to lower back down but continues t idle really rough. I did a obdII test and got code p0130 lean condition. I thought it was the O2 sensor so I changed it, then checked for a vacuum leak but couldn't find any (but to be fair I don't really know what am looking at) anyway the long term fuel trim is at +12% and the short term fuel trim is at +11%. Any ideas would great.
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[HarrysDad]

Which Lambda sensor did you change? P0130 is usually bank 1 sensor 1 which is the sensor in/nearest the manifold.

[Pauly_ev]

I changed the one attached to the manifold just before the cat.

[petrol_head16v]

Check the cat isn't blocked or twisted look thru the top lamda hole and up from the botton

[liviu2004]

7 kg/h air mass is a bit to the low end. Would expect more like 8-9-10 kg/h and you're problem is gone. Try new genuine or siemens air mass meter.