Was the replacement MAF a genuine one ie Volvo/ Bosch from a reputable scource or a fleabay item.
Fleabay MAF's have a reputation for only working 10% of the time correctly.
You can order from Bosch. The part numbers are on there and its cheaper than from Volvo.
Genuine MAF's can be cleaned with electrical cleaner and put back into service. Mine has done 10's of thousands of miles over the time when I was told it was scrap by cleaning it.
Hope this helps
Cheers
Bob
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