The codes say you have a open circuit like a broken wire,replaceing the oxygen sensors will not fix this problem.
GROUP: Vehicle Performance
DATE: Apr. 25, 2003
Erroneous MIL Illumination - Erroneous Diagnostic Trouble Codes (DTCs)
This bulletin involves replacing the Powertrain Control Module (PCM).
2002 (LH) 300M/Concorde/Intrepid/LHS
Vehicle operator may describe MIL illumination.
For all 2002 applications, technicians may find the following erroneous DTCs:
P0071 - Ambient Temperature Sensor Performance
P0111 - Intake Air Temperature Sensor Performance
P0116 - Engine Coolant Temperature Sensor Performance
P0128 - Thermostat Rationality
P0325 - Knock Sensor # XXXXX Circuit
For all 2002 3.5L applications, technicians may find the following erroneous DTCs:
P0121 - Throttle Position Sensor # XXXXX Performance
For all 2002 2.7L applications built before Nov. 9, 2001, technicians may find the following erroneous DTCs:
P0420 - Catalytic 1/1 Efficiency
P0432- Catalytic 2/1 Efficiency
For all 2002 2.7L applications built before Aug. 27, 2001, technicians may find the following erroneous DTCs:
P0401 - EGR System Performance
Using a Scan Tool (DRBIII(R) with the appropriate Diagnostic Procedures Manual, verify all engine systems are functioning as designed. If DTCs are present, other than those listed above, record them on the repair order and repair as necessary before proceeding further with this bulletin.
For DTC P0128: If the thermostat has been serviced, ensure it is the correct thermostat for the engine and that it is seated properly in the housing, with the correct gasket. Be sure the coolant is the correct mixture. Be sure the cooling system has been properly purged of air.
When the engines are manufactured, the thermostats are staked into place. When servicing the thermostat remember to grind down the stake (or change the housing) to make sure the staking is not in the way, Otherwise the thermostat won't seat properly and the system will interpret this as a thermostat malfunction
If for p0128 you done what it say than you will need to replace the PCM for code p0128