Question about 1996 Jeep Grand Cherokee

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1996 Jeep Cherokee. O2 sensor problem.

Had catalytic converter replaced under recall, did not even get to drive it off dealer lot when check engine light came on. Dealer will not fix under recall. Thinks oxygen sensor is bad. Which one should I replace pre or post cat convertor.

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  • Anonymous Mar 14, 2014

    my oxygen sensors was bad than my catalytic convertor went out. is it because of the bad front oxygen sensors

  • Anonymous Mar 29, 2014

    check engine light

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I would check with the dealer who changed the converter to check and see if the sensors were damaged while they replaced the converter or may be they have forgotten to hook it back up check before you throw away your good 02 sensr

Posted on Nov 12, 2008

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Where is the heater o2 censor located


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Mar 02, 2011 | 1997 Jeep Grand Cherokee

1 Answer

Check engine light code is p0420 and it dont tell me where this sensor is what is catalyst system bank 1 low efficiancy


There is not a problem with a sensor there is a problem with the catalytic converter. P0420 sets when the downstream o2 sensor is either reading higher than expected or reading simular to the upstream O2 sensor. Either way it is usually the catalytic converter that is the source of the problem and rarely the downstream O2 sensor.

The Catalytic converter is located in the exhaust system under the car. Catalytic converters from either the dealer or a quality direct fit part from a reputable manufacturer are recommended. Cheap cats lead to lots of problems!

Feb 13, 2011 | 2004 Chevrolet Impala

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06 lincoln navigator check engine code p0420 what that mean


There is a problem with the catalytic converter. P0420 sets when the downstream o2 sensor is either reading higher than expected or reading simular to the upstream O2 sensor. Either way it is usually the catalytic converter that is the source of the problem and rarely the downstream O2 sensor.

The Catalytic converter is located in the exhaust system under the car. Catalytic converters from either the dealer or a quality direct fit part from a reputable manufacturer are recommended. Cheap cats lead to lots of problems!

Feb 13, 2011 | 2006 Lincoln Navigator

2 Answers

1996 grand cherokee starts fine and runs great the first 5 minutes. Then it runs like ****..doesn't completely stall but runs really rough. Like it wants to stall but doesn't. Replaced the fuel pump and...


First thing is; When you changed the fuel pump, did you compare the 2 to see if they were identicle?, because it's possible that you could have the wrong fuel pump.. Second; you should have changed the fuel filter when you changed the pump, if not? you need to put a new fuel filter on... Third... It is possible for the upper o2 sensor, because on your Jeep, you have an OBD II system, which is, ( On Board Diagnostics II) and that system uses two "o2" sensors; One before the catalytic converter and one after the converter. The Primary o2 sensor is the one before the converter; The secondary o2 sensor, or catalyst monitor, is located after the catalytic converter.
The two o2 sensors work on an "open loop and closed loop". When the motor is cold, the o2 sensors are in open loop, which means they are not being used to monitor the exhaust gas, and when the motor warms up- after 5 minutes or so, then the computer switches to "Closed loop" and the o2 sensors are then used to monitor the exhaust gasses, so it is possible that your primary o2 sensor, or the one before the catalytic converter is bad.... But! It's very rare for both o2 sensors to go out at the same time.... I hope that answers your question & gives you an idea of how the o2 sensors work in conjunction with the fuel injection system.

Apr 29, 2010 | 1996 Jeep Grand Cherokee

1 Answer

$250 oxygen sensor parts only 2002 Jeep GC too much? needed?


YEP A BAD OXYGEN SENSOR WILL CAUSE ENGINE TO RUN RICH.CAUSING UNBURN FUEL TO GO TO THE CATALYTIC CONVERTER AND BURN IT OUT.

Aug 23, 2009 | 2002 Jeep Grand Cherokee

1 Answer

O2 sensor location for jeep cherokee


there are three one on each side if it's a v6 look on the side of the engine you will see two to 4 wires coming out of the exhaust pipe, then after the catalytic converter under the car there is a after cat o2 sensor.

Jun 25, 2009 | 1997 Jeep Grand Cherokee

1 Answer

Check Engine light- catalytic converter


It might be helpfull to know the codes of the "check engine"lite but it seems the PCM is the issue,be sure the O2 sensors were the correct ones and which dealer made the recall? an used-car one or a Chrysler one?if no solution,you should go to a chrysler/jeep dealer and talk to solve this because it is a recall involved and they should repair your SUV at no cost no matter the miles on the odo!.buena suerte!

Nov 04, 2008 | 1996 Jeep Grand Cherokee

1 Answer

1998 Jeep Cherokee Classic;165,000 miles. Check engine light comes on sporadically. Been told catalytic converter is trashed. Sometimes starts great; sometimes hard start. ...


Did you know Jeep did a recall and paid for replacement of catalytic converters on 1996 models (don't know about any others) - they reimbursed me for work done, up to a point - hope this helps!

Aug 02, 2008 | 1996 Jeep Grand Cherokee

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