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Hi Im David, thanks for visiting the site
P0401 JEEP - Exhaust Gas Recirculation System Performance Possible causes - EGR passage clogged - Faulty EGR Vacuum Modulator Valve - Faulty EGR Valve - Faulty EGR solenoid valve - EGR solenoid valve harness is open or shorted - EGR solenoid valve circuit poor electrical connection - Dead (Weak) battery - Faulty EGR temperature sensor and circuit - Exhaust gas leaks
P0175 JEEP - Fuel System 2/1 Rich Possible causes - Faulty front heated oxygen sensor - Ignition misfiring - Faulty fuel injectors - Exhaust gas leaks - Incorrect fuel pressure - Faulty Mass Air Flow (MAF) sensor
P0172 JEEP - Fuel System 1/1 Lean Fuel System Rich Possible causes - Faulty front heated oxygen sensor - Ignition misfiring - Faulty fuel injectors - Exhaust gas leaks - Incorrect fuel pressure - Faulty Mass Air Flow (MAF) sensor
one thing in common with all three EXHAUST GAS LEAKS.... you blew something out. first things is check the egr for a blown out hole, then if thats not the case do a back pressure test. i always tell my customers if you mod a vehicle expect problems.
checking in to see how its going
I can send you the repair steps to diagnose these codes from the factory service manual.
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