Need a diagram of where the o2 sensors are located its a 4.0 the codes that are coming up are p0155 and p0143
I dont have adiagram fore this but you shoud find them in the manafolds and converters.you can get this codes from other problems.If it is saying too low or high I would look it too it
SOURCE: 2001 Jeep Gr Cherokee V8 trouble code P0155 Oxygen
Sensor #1 is the sensor before the converter (upstream sensor)
SOURCE: dtc codes p0155 & p0051
I had the same problem and found out I was sold the wrong sensor, my 4.0 has four, they are all different, when you install a new sensor, you must make sure you clear the trouble code before you start the engine, ignition on engine off, that should do it, it worked for me, also if you have your own scanner and can erase the codes yourself, the wrong 02 sensor will turn engine light on with cold start, then after I erased the code it would stay off all day until the next cold start, thats when I found out my new 02 sensor was for bank 1 sensor 2, and not bank 2 sensor 1, hope this helps
SOURCE: P0155 & P0135
O2 sensors are tricky. sometimes like anything else they fail. many times though the exhaust mixture they encounter is out of their range and that shows up as a failure.since you seem to have no other problems , I would go ahead and change them, but don't be disappointed if the code shows up again (at least you know it's not the sensors.) I don't like using the process of elimination when doing repairs but sometimes you must.
SOURCE: diagram throttle position sensor for jeep grand
Take the Intake Air Hose off. This goes from the Air Filter to the Throttle Housing. When you see the Throttle Gate draw a horizontal line across the center - this should be the the Throttle Gate Pivot Arm. The Throttle Position Sensor is lined up with this Pivot Arm. It should be the only sensor lined-up with this. There should be a Idle Air Sensor that is located above this, but this is not lined-up to the Throttle Gate Pivot Arm.
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SOURCE: I have a 2004 Cherokee Jeep a P0155 code is
O2 Sensor Heater Circuit Bank 2 Sensor 1,
yes you can drive it,it might reset its self if not it is the oxygen sensor on the passenger side,before converter
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