The 1.8 engine in the V50 does not have a MAF sensor. I think you're referring to the MAP sensor. Is it the little thing screwed into the bottom of the plastic manifold? If so it will be covered in oil, because (sensibly) they put it straight opposite the oil breather in there.
I'm having exactly the same issues though with (what was) my V50 1.8 and I'm at a loss! No engine light or fault codes though. EGR occasionally sticking open possibly? Or the throttle bodies sometimes play up. Don't want to go spending money on part after part trying to diagnose the problem though.
EDIT: Hence why the sensor you're finding is only £25. MAP's are pretty cheap, MAF's are expensive.
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Current: 2003 VW Passat 1.9TDI, 1979 Saab 99 turbo, 1968 MGB GT,
Last edited by martin93; Aug 1st, 2019 at 19:05.
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