I checked everything above except reset value. I'm not sure about that either. I am still getting the check engine light. I even dropped oil pan and change two seals but to no avail. Any other suggestions?

So, I am back with an update. I replaced the whole PCV system and it was extremely clogged. It seems to have fixed the MAF code that I was recieving. I haven't received it since the replacement. I still keep getting the P0027 exhaust selenoid code. I have replaced both intake and exhaust and am stil...

Thanks for the info. I was receiving the same codes prior to an work. I starting with just changing the MAF and having checking Timing Belt since it was just changed 30K miles ago. As i continued to have the code returned, I'm looked for other possible causes which let me to changing hubs, seals and...

Hello. I have a 2006 volvo xc90 2.5t. I keep getting p0027 and when i use autel scan get 614B anf 120D code. I have changed MAF but still get Air mass code. As far as timing, I have changed exhaust selenoid and cleaned intake selenoid, changed timing belt, idler and tensioner, cam hubs (intake &...