My service engine light is on. There are two trouble codes that showed up in the diagnostic...P0174 and P071. Both show the MAF as the problem. I changed it and the light is still on. The other potential problem source appears to be the oxygen sensor for bank 2 sensor 1. Does this approach sound right? Where is the the oxygen sensor for bank 2 sensor 1? Thanks

 

The O2 sensors should be last on the list to even consider replacing

Along with the intake manifold gaskets.

While replacing or cleaning the MAF, the negative battery should be

Disconnected while doing the work.

Then a careful check of any vacuum lines or fittings after the MAF for

Leaks.

PVC and oil cap should also be checked.

Fuel pressure and injector o rings could also cause these codes.

 

Vacuum leaks account for probably more than 90% of the occurrences of that code combination.

Plug 'em into the SEARCH tool for hundreds of prior posts...

 

Ck your fuel trim # ,if you have a scanner . Ck your fuel filter . Ck for vac leaks . Vac leaks and fuel problems cause these codes quite often .

 

Thank you all for your assistance.