APO/FPO, Africa, Alaska/Hawaii, Asia, Barbados, Bermuda, Canada, Central America and Caribbean, Europe, French Guiana, French Polynesia, Greenland, Guadeloupe, Libya, Martinique, Mexico, Middle East, New Caledonia, Oceania, Reunion, Russian Federation, Saint Pierre and Miquelon, South America, Southeast Asia, US Protectorates, Ukraine, Venezuela Show A bad oxygen sensor could be the cause of a check engine light. You can replace the sensor yourself in your own car. You will be able to save money with diy. Step 1
 First you must locate the bad oxygen sensor. You can have your car diagnosed at Auto Zone for free which will specify which sensor out of four sensors. The 1993-2004 Jeep Grand Cherokee 4.0L engines have four oxygen sensors. Two located upstream and two located downstream. See attached diagram. 2 upstream (referred to as 1/1 and 2/1) and 2 downstream (referred to as 1/2 and 2/2). With this emission package, the rear/upper upstream sensor (2/1) is located in the exhaust downpipe just before the rear mini-catalytic convertor. The front/upper upstream sensor (1/1) is located in the exhaust downpipe just before the front mini-catalytic convertor. The rear/lower downstream sensor (2/2) is located in the exhaust downpipe just after the rear mini-catalytic convertor, and before the main catalytic convertor. The front/lower downstream sensor (1/2) is located in the exhaust downpipe just after the front mini-catalytic convertor, and before the main catalytic convertor. Step 2
Second you must purchase your oxygen sensor either from a local automotive parts store or online. I recommend BOSCH oxygen sensors. All four oxygen sensors located in the Jeep Grand Cherokee are different prices and sizes. While you are purchasing your oxygen sensor, ask the store clerk or look online for an oxygen sensor socket. It has a split down the middle for the cable to fit. Step 3
Third, use the picture above for specific location on the oxygen sensor you need to replace. Use the socket to remove the bad oxygen sensor and replace it with the new one. Tips
Things You'll Need
Warnings
Writer Bio This article was written by a professional writer, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. To submit your questions or ideas, or to simply learn more, see our about us page: link below. More Articles Joined Jan 31, 2009 · 16 Posts
Discussion Starter · #1 ·
Feb 4, 2009 Hello- Thanks, Mark Joined Jan 12, 2009 ·
85 Posts
Guessing V8 here...bank 1 is the side cylinder 1 is on, just don't know off-hand on this motor. (sensor 2 is after-cat). I'll try a search and get back to you. Codes will need to be cleared after fix. Good idea to go ahead and soak threads with penetrating oil, not when hot!
Joined Jun 3, 2008 · 3,323 Posts Joined Jan 12, 2009 · 85 Posts
You could replace one sensor, disconnect battery to clear codes, reconnect and drive until light comes on (or doesn't). If light comes back, put old sensor back and replace other. Easy to do, 5 minutes if you soaked rust with oil! Be careful not to damage new sensor when swapping.
Joined Aug 5, 2005 · 3,268 Posts
Hello- Thanks, Mark Sensor 2 is a sensor after a minicats. (Sensor 1 is in front of a minicat, so you have two Sensor 1s along with the two Sensor 2s.) For your I6, Bank 1 is the first (at the front, closest to the radiator) three cylinders while Bank The CA emissions diagram at this URL will make this clear.
http://www.wjjeeps.com/oxygen_40.jpg Joined Jan 12, 2009 · 85 Posts
Figured the "dual exhaust" was each manifold on the V8, oh well....never studied the exhaust on my XJ (4.0). Joined Jan 12, 2009 · 530 Posts
i have the same code p0138 and i had picked up the bosch oxy sensor, hopefully the light goes off Joined Apr 28, 2008 · 5,262 Posts
i have the same code p0138 and i had picked up the bosch oxy sensor, hopefully the light goes off Return it and get a mopar. Joined Jan 12, 2009 · 530 Posts
ill have to pass on that, my pockets aren't filled with money, and i have to see if i need it first, im going to take it out and clean it. Joined Apr 28, 2008 · 5,262 Posts
ill have to pass on that, my pockets aren't filled with money, and i have to see if i need it first, im going to take it out and clean it. Getting the mopar sensor from kolak will cost maybe ten bucks more. Don't install the bosch, then you might not be able to return it and you'll be out that much
more money once you've bought both. Trust me on this... others on here will tell you the same: Jeeps do not like bosch O2 sensors. Return it. Joined Jan 31, 2009 · 16 Posts
Discussion Starter · #11 · Feb 6, 2009 from the general consensus here I will say I regretfully already bought and installed the bosch sensor. I have not disconnected the battery/reset the computer, but the problem has not gone away. tomorrow I will reset and then try swapping the sensors if they still read the same. thanks, mark Joined Jan 19, 2004 · 1,438 Posts
CA emissions suck. It is just a bunch more crap to go bad and cause pain and suffering down the road. Who ever heard of four O2 sensors on an I6? That is crazy. Why not just have twelve O2 sensors, two for each cylinder. That could make our air quality better. When I bought a Bosch for the WJ (Bank 1 / Sensor 2 on the 4.7L HO), it was completely
the wrong size. I returned it and bought a Mopar one. That one fit perfectly. Regarding power, you could check the belt and the ground connections. You could even have water or PS pump problems slowing the belt down or making the belt slip. Check the tension, too.
Joined Jan 31, 2009 · 16 Posts
Discussion Starter · #13 · Feb 6, 2009 after searching through the forums a bit, the following seem like likely culprits... one of the codes read before said I had a vacuum leak, and one of the other threads stated the exact same problem I have was fixed by fixing the
egr valve. however, after looking in my Haynes manual, my model does not have an egr valve. so, back to the drawing board. Joined Jan 31, 2009 · 16 Posts
Discussion Starter · #14 · Feb 6, 2009 forgot to mention, regardless of the setting, air only blows out of the defrost vent. Joined Dec 12, 2006 · 4,866 Posts
ill have to pass on that, my pockets aren't filled with money, and i have to see if i need it first, im going to take it out and clean it. Ronnie, Listen to the other guy. I had a Bosch sensor once and - no joke - It ran as good as a bad OEM sensor. And dont even try cleaning it, it wont work. Joined Jan 31, 2009 · 16 Posts
Discussion Starter · #16 · Feb 6, 2009 good news. the o2 sensor fixed the problem. I just had to reset the computer. onto a trans fluid change and a tune up. get this puppy cookin. Which 02 sensor is bank 1 sensor 2?For example, a DTC that reads “Bank 1 sensor 2” means that the O2 sensor is located on the same side as cylinder 1, after the catalytic converter. On the other hand, a DTC that reads “Bank 1 sensor 1”, means the O2 sensor is located before the catalytic converter, on the same side as cylinder 1.
Which O2 sensor is bank 1 sensor 2 upstream or downstream?Sensor 1, Sensor 2
Sensor 1 is the sensor closest to the engine. Sensor 2 is the downstream oxygen sensor. It is always going to be located after the catalytic converter. Its job is to monitor the oxygen content exiting the catalytic converter in order to determine if it is operating efficiently.
Where are the O2 sensors located on a 2002 Jeep Grand Cherokee?The front/upper upstream sensor (1/1) is located in the exhaust downpipe just before the front mini-catalytic convertor. The rear/lower downstream sensor (2/2) is located in the exhaust downpipe just after the rear mini-catalytic convertor, and before the main catalytic convertor.
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2002 jeep grand cherokee o2 sensor bank 1 sensor 2 location
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