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What size engine is in this Grand Cherokee? You should be able to get a 13/16 wrench on the hex and remove it. If clearance is an issue, then an O2 sensor socket that is available at most auto stores will be required. I'll need an engine size for an exact location of this O2.
I just had this problem on my 1996 Jeep Grand Cherokee. Once the engine got warm, after about 15 to 20 minutes, the car would just die at random times, sometimes when doing 40 mph and sometimes at idle.
I ended up changing the Crankshaft Position Sensor and it cleared the issue.
Changing the heater core requires complete removal of the dash panel
and plenum box. To do this you have to remove the steering wheel,
steering column, evacuate and recharge the refrigerant system and drain
the radiator. I would only consider changing the heater core if it is
physically leaking into the passenger compartment. If the problem is
heat transfer to the HVAC system only, the problem is more likely with
the blend doors. Check heatertreater.net for pictures and diagnostic
first make sure u have the wires correct. You will need to perform a combination of unlocking and locking the door and starting the car do not use the valet key. call or visit your local dealer about the combo.
Chrysler in their goal to make a buck put splices inside the rubber tube between the door and the a pillar on later Cherokee's. This is to spit the harness between the main door speakers and optional tweeters.The plugs for the tweeters will be there no matter if you have them or not. These connectors make the wires more susceptible to breakage. Have a stereo shop rewire your front speakers.
there are specific tests you can run before changing parts...You should show an open circuit with no resistance between b&c connector pins on the crank sensor. (check with ohmeter) You also need to check that you have fuel /spark and test related items. (cps can kill both)