Re: P0053, now P0171 and P0174
You could have leaking intake gaskets due to these codes or your fuel pressure is too low due to an intermittent fuel pump failure that just so happened to occur after you changed the O2's. Or your old O2's were not capable of giving correct AFR's.
My advice to you would be to reset your codes and install the old O2's back in and see if the problem follows. If it doesnt then the means two things
1. your new O2's could be faulty...
2. Your new O2's are actually correct and are capable of reading AFR's (where as your old O2's could not) to the point that you are indeed lean and need to further address either a vacuum leak after your MAF or your fuel pressure is low.
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