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hi.fault codes indicate feul presure or leaks.if feul presure is ok and no vacuum leaks at vacuum pipes intake manifold or brakebooster it can be a exhaust leak if no leaks it can be a blocked cat or not enough back presure like exhaust box removed or cat insides removed .hope this helps
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.
Vacuum leak is most likely candidate, but can also be a fuel pressure or injector problem. To test the sensor, the computer purposely commands a quick rich lean cycle to see how fast the sensors react. If injectors are dirty, pressure is off or there's a vacuum leak, it can screw up the response time.
Code 171 is fuel system too lean bank one, and 174 is the same for bank two. Usually a vac leak or low fuel pressure.
Code 128 is for the engine not reaching normal operating temp. Usually a thermostat problem.
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.