rattbeard

i am new to jeeps i have a 2000 jeep Cherokee the check engine light is on the code says running lean bank 1 and2 but it is actually running very rich you can smell fuel if i clear the code it will run fine for a few days the light comes back and it starts running rich again i have replaced injectors plugs all sensors on throttle body cleaned throttle body and a lot more any iideas

Saudade

Welcome. What exactly are the codes (all codes). Also post the freeze frame data.

If the O2 sensors detect a lean condition, the PCM will add more fuel to compensate.

If your scanner shows live data, you should look at fuel trims and O2 sensor voltages.

rattbeard

codes are 171 174 i have replaced all 4 oxygen sensors crank sensor had it smoke tested fixed all leaks had it to 3 garages on there computers they fixed what they said was wrong still same problem

awg

Forget about shop ********* for the moment

Buy yourself an OBD2 scanner (as little as $30) free Download Torque Lite on to you mobile phone

Now you can read & clear codes, and scan live data

As the previous answer, its highly likely one of the primary O2 sensors, or its wiring is defective, causing the PCM to constantly enrich

(OBD2 will show when vehicle is in open or closed loop mode)

The behind CAT sensors dont have as much effect as pre-CAT

From my knowledge and experience, its common for "new" O2 sensors to be defective, only use reliable brands, check archives on that, I believe NGK is ok, check Rock Auto for parts and info

rattbeard

I have a blue driver scanner the problem is my knowledge on how to use it is limited i had a motorcycle crash and had a mild brain injury some thing new is hard for me to understand that is y i drive old cars and i still cant figure it out

awg

In your case, I can only advise look at a few Youtubes on doing what I said

Otherwise you will be at the complete mercy of repair shops

Th electronics of an XJ are immensely complex, its not an "old car" that would mean a carb vehicle, not fuel injection with a computer controlling all aspects

Its the same for everyone, takes less time to learn than drive to the repair shop, wait around, get lifts, be fkd about etc etc

What do they say, dont give a man a fish, rather a fishing rod

I have extensive knowledge of acquired brain injury so please dont take my comments the wrong way

KoboldKrawler

You could try maybe watching this video on how to use it. It isn't super specific step by step but imo it has the info you might need to make it work for you.