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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.
check fuel pressure, check fuel pressure regulator, change fuel filter. If fuel pressure is low it could be a bad pump, a clogged filter, or a malfunctioning fuel pressure regulator. If all those check out, then check crankshaft and camshaft position sensors.
Replace the Airflow Meter, then take off all those parts you put on. If you have a scan tool, the long term fuel trim is probably %25+Which is definately an airflow meter, but it's definately worth trying it anyway, they've had such a problem w/ them you can get one for under $100 easy.
dont look for air when the car cuts out its most likley spark or fuel when it cuts out ranomly its usually a sensor or relay that is faulty check fuel pump relay and camshaft or crankshaft sensors but first narrow it down to spark or fuel if possible also if check engine lite is on check codes
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