Join Date: Apr 2007
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So guys here is the skinny on the problem so far. I found an exhaust leak near the forward 02 sensor and the CAT. Fix both of them using a metal sealer. Also found a small vacuum leak in the hose leading to the ventilation vents. Fixed that. Then I cleared the code and fired up the jeep.
Check engine light came on again with code p0171 lean. The exhaust is still running rich.
Is there any way to check the other monitors, (02, map, coolant & air temp) to see if they are working properly? Has anyone ever used the software Autotap? I read it is useful in reading all monitors and their levels at any time.
I've been searching the web for any information and found that code p0171 is a real hard nut to crack. Apparently it is one of those codes that indicated a mulitude of possibilities. Fuel pump, weak coil, bad plugs, bad 02, MAP, fuel injectors, air & coolant temp, exhaust leak, vacuum leak, bad spark plug wires, and some other things I have already forgotten.