O2 sensor error and location of the sensors

Before you replace either oxygen sensor, verify the lean condition. You might have a vacuum leak or a fuel system problem such as faulty fuel injectors, failing fuel pump, or possibly a bad fuel pressure regulator. With both oxygen sensors involved it could even be an exhaust leak pulling outside air into the exhaust system past the oxygen sensors. Hope that helps! Jim

Right tackle the P0174 first, clear the codes and run the drivetime protocol and see if the P2098 code returns.