replaced oxygen sensor car won't start

2006 NISSAN SENTRA
170,000 MILES • 4 CYL • FWD • AUTOMATIC
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JPYLES
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2006 Nisan Sentra hard to start when weather is cool. the check engine light is also on took it to the auto parts store and they checked it and said it was the oxygen sensor (upper) replaced it . weather is cold and it won't start
Feb 10, 2011 at 10:09 PM
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RASMATAZ
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The O2 sensor will not prevent the engine from starting up-

Get a helper disconnect a sparkplug wire or 2 and ground it to the engine atleast 3/16 away from ground-have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, Do you hear the fuel pump come On when you turn key on? If not check fuel pump fuse and fuel pump relay if so, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs,coil's resistances,cap and rotor,distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it and keep testing
Feb 10, 2011 at 10:28 PM