Hello all, I am new the group and new to Jeep ownership. I recently picked up a 06 Wrangler X with the 4.0 and the 6-speed. It has a 6" lift and some other goodies. It is a bit of a project and a little rusty as I live in Vermont. It does run and drive well especially for being lifted. When I test drove it it had no engine lights, but on the 1.5 hour ride home the engine light came on. I scanned it with my scanner and I am getting P0172 and P0138. I understand the 138 code is voltage relating to the downstream o2 sensor. P0172 is fuel to rich. Think these two codes will be taken care of by replacement of the one sensor? I know to use NTK, and have read around this forum a bit before posting, but I could not find anyone with these two codes together at the same time. I also have the typical "only works on defrost" heater and I found a bad check valve coming of the vacuum manifold today. It has a new exhaust on it and sound like it has no leaks. Before I start chasing sensors and other things I just wanted to see if anyone could get a better pin point for me. It has Chrysler fuel injectors in it, and not the 4 hole ones. It has 150k on it, and seems to be have taken care of okay, but unsure about the o2 sensors.
Ordering the one downstream o2 sensor and a new vacuum check valve, Is there anything else I should look for in the meantime? It runs great and does not seem to smell like fuel. The only thing I notice is at warm idle it does seem to vibrate you in your seat a bit and if you blip the throttle it takes just a second to respond. I'm new to the 4.0 and am not sure if that is normal. No indication of misfire or puffing out the exhaust.
Thanks!
-James
Ordering the one downstream o2 sensor and a new vacuum check valve, Is there anything else I should look for in the meantime? It runs great and does not seem to smell like fuel. The only thing I notice is at warm idle it does seem to vibrate you in your seat a bit and if you blip the throttle it takes just a second to respond. I'm new to the 4.0 and am not sure if that is normal. No indication of misfire or puffing out the exhaust.
Thanks!
-James
