Had 3 codes come up for ox. sensor..po155-po151-po153 which one to replace and exactly where located?

Unlikely that both sensors are causing the exact same codes. First I would check for vacuum leaks. Then check the wiring from the sensor to the ECM and fuse panel. Pull fuses and relays for the entire system. I have fixed many cars because of corrosion at the fuse or relay. Do this to every panel you have.

P0153 & P0155 both relate to Heated oxygen sensor 1, bank 2, slow response and heating circuit inoperative- pos new sensor needed.

P0305 is misfire detected on cylinder 5
P0316 is misfire detected during first 1000 revolutions after start up.

replace oxygen sensor bank 2 sensor 1

Code 155 is for a problem with the heater circuit in the O2 sensor for bank two. Bank two is on the side with cylinder number two.
Usually the sensor is faulty, but the heater circuit would need to be checked to be sure. The sensor has a built-in heater to get it hot quickly after starting the engine.

codes PO131 PO151 PO154 okay. code PO131 - o2 sensor circuit low voltage bank 1 sensor 1. code PO151 - o2 sensor circuit low voltage bank 2 sensor 1. code PO154 - o2 sensor circuit no activity detected bank 2 sensor 1

code po122 is for your throttle position sensor. po155 is for your down stream o2 senor .po135 is for your bank 1 sensor 1 o2 sensor. po102 is for your maf sensor

CODE PO155 - HO2S 21 BANK 2 SENSOR 1 HEATER CIRCUIT MALFUNCTION CONDITIONS.CHECK O2 SENSOR FUSE AND WIRING CRCUIT BEFORE BUYING A NEW HO2S.IF SENSOR BAD REPLACE IT.THEN YOU CAN CLEAR THE CODE.

CODE PO151 - HO2S - 21 BANK 2 SENSOR 1 CIRCUIT LOW INPUT. CODE PO153- HO2S BANK 2 SENSOR 1 CIRCUIT SLOW RESPONSE. CODE P1151 - LACK OF HO2S - 21 SWITCHING HO2S SIGNAL LOW INPUT. POSSIBLE CAUSES TO YOUR PROBLEM AIR INTAKE SYSTEM LEAKING VACUUM HOSES LEAKING OR DAMAGED.AIR LEAKS LOCATED AFTER THE MAF SENSOR MOUNTING LOCATION OR IN THE PCV SYSTEM. YOU COULD HAVE BASE MECHANICAL FAULT LIKE LOW CYLINDER COMPRESSION , VALVE TIMING OFF.HO2S CIRCUITS WET OR OILY CORRODED OR POOR TERMINAL CONTACT. HO2S SIGNAL CIRCUIT OPEN SHORTED TO GROUND SHORTED TO POWER OR THE SENSOR HAS FAILED. LOW FUEL PRESSURE OR VECHICLE DRIVEN UNTIL IT WAS OUT OF FUEL. BEFORE REPLACING PCM CHECK ALL VACUUM HOSES ON INTAKE MANIFOLD. REPLACE FUEL FILTER. CHECK YOUR SPARK PLUGS. IF SPARK PLUGS OIL COATED PROBLEM IN THE ENGINE ITSELF. YOU HAVE WORN PISTON RINGS, WORN VALVE GUIDES AND WORN VALVE SEALS. IF PCM WAS BAD YOU WOULD HAVE FLASHING CHECK ENGINE LIGHT CAR WOULD RUN POORLY.YOU WILL HAVE FAULT PCM CODE IF PCM FAILED. YOUR PROBLEM IN HO2S SENSORS AND THE ENGINE AIR FUEL MIXTURE.

PO153 is Upstream heated 02 sensor circuit slow response Bank !
PO151 is same as above but shows low voltage bank 2.

Did you mean P1151 or PO151, It seems this o2 needs to be replaced. Buy the aftermarket if you buy one. I work and run the line that these are assembled on. The aftermarket is the same, just looks a little different. OEM is $120 and Aftermarket is $40-$60. But they both have the same internal elements and are tested, assembled the same way.

Yes sorry but they both should be replaced.