SOURCE: possible cracked manifold
Take it to a muffler shop, they work on exhaust problems all the time and may just need a new gasket from the collector flange which would not be that expansive. Almost all of them will inspect for free since there looking for your business.
I have not sean exhaust manifold go bad before the whole car or truck and the exhaust pipe is stainless so good chances are that it's the flange gasket or the bolts may have broke due to time and vibration.
Good luck and keep me posted.
SOURCE: o2 sensor location 1997 pontiac grand am 2.4 4 cyl auto trans
BANK 1 SENSOR 1 IS THE ONE IN THE EXHAUST MANIFOLD. BANK 2 SENSOR 2 IS BELOW THE CATALYTIC CONVERTER.
P0171 SHOULD GO AWAY WITH A GOOD O2 SENSOR BUT DO CHECK FOR VACUUM LEAKS TO BE SURE. 3.1/3.4L ENGINES HAVE A BAD DESIGN INTAKE MANIFOLD GASKET, THE LEAK OIL, COOLANT, AND AIR.
check your intake manifold and check the freeze plugs
SOURCE: exhaust manifold
A cracked exhaust manifold should not effect your motor unless you have an exhaust driven turbo or something depending on exhaust back pressure to be there. I know where I live you can not get a vehicle with exhaust leaks infront of the passengers compartment inspected though so you may want to have the leak fixed for passenger safety.
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