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Cod of 51 on grand cherokee 5,2 which o2 sensor is out of order

When I drive my jeep with trouble because no acceleration when I hold down gas pedal and I think there is a parachute behind it

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  • YILDIRIM SUNGUR Dec 10, 2012

    I want to ask you about of code 51 means ..can it's meaning be bad cat convertor or not besides o2 sensors

  • YILDIRIM SUNGUR Oct 12, 2014

    I found the problem on TV cable is loosen for that reason there is no simultaneously between engine throtle and transmission case

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Well, code 51 means the O2 sensor is telling the computer the fuel mixture is lean. So the computer tries to make the mixture rich by opening the injectors longer. I doubt the sensor has failed, but rather your fuel pressure is low.
If the sensor has failed and pressure is normal, you should have black smoke coming out the exhaust pipe.

Posted on Dec 10, 2012

  •  Stephen
    Stephen Dec 10, 2012

    Not really. If the cat is stopped up you will know the exhaust is restricted. If it is open it might change the reading on the O2 sensor but not by much. Thats why they started using another O2 sensor after the cat in later years so the computer could monitor the cat performance. Usually a code 51 means the fuel pressure is low or there is an air leak somewhere in the intake or exhaust before the sensor. Or the sensor has failed.

  •  Stephen
    Stephen Dec 10, 2012

    The sensor is designed to switch back and forth between rich and lean and the computer changes the on time for the injectors accordingly. If the computer can not make the sensor reading switch the light comes on.

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Right rear?...Code 51 signifies a lean running condition from an abnormally rich correction factor. That means the computer tried to correct lean running by increasing injector on-time duration to max, but still can\'t keep up with lean condition. Likely it\'s not the sensor, but a vacuum leak letting your intake suck in extra air. Check your vacuum hoses for leaks or breaks, check the big air boot going into intake for loose fit or tears, punctures, and check your intake mounting for leaks-maybe your intake manifold gasket has failed.

Posted on Dec 10, 2012

Testimonial: "thanks for everbody but I can find the problem on TV cable TV cable is very loosen and there is no simultaneous between engine throtle and transmission case .when I adjusted the TV cable problem is gone"

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mcgyver468
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SOURCE: Vehicle dies while driving-no acceleration possible

TRY CHECKING THE WIRE CONNECTORS ON THE PCM WHICH IS LOCATED ON THE PASSENGER SIDE FIREWALL. IT HAS THREE LARGE MULTI-WIRE CONNECTORS HELD IN PLACE BY THREE BOLTS. WIGGLE THE CONNECTORS WHILE TIGHTENING THE BOLTS CAREFULLY SO AS NOT TO BREAK THE FRAGILE PLASTIC ENDS. HOPE THIS SOLVES THE PROBLEM. KEEP ME POSTED PLEASE. THANKS FOR USING FIX-YA. GOOD LUCK

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SOURCE: 98 Jeep Grand Cherokee - Won't run without holding gas pedal down

same problem I overheated my jeep and ruined the Idle control sensor. put a new one in and it fixed the problem

Posted on Jan 04, 2009

sparksflyin
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SOURCE: 2000 Jeep Grand Cherokee brakes make a hissing noise

has your brake pedal seem to be stiffer than usual? the sound you hear is from the brake booster if it has a leak it will cause a noise but you would have a stiffer pedal because the booster is loosing vacuum.

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SOURCE: Car dies at random moments

I just had this problem and replaced the camshaft sensor, crankshaft sensor, and coolant temp sensor. i replaced these items because of high mileage. try these but first check your relays located under the hood on the passenger side. sometimes they get hot and fail.

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SOURCE: A/c goes from vents to defrost under acceleration

Sounds like a vacuum problem.Listen for hiss noise under hood and under dash. may have a bad vacuum diaphram that controls blend door or leaking vacuum line.

Posted on Jul 26, 2009

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