Any ideas what could be wrong

Asked by Mar 06, 2017 at 02:58 PM about the 2003 Jeep Liberty Limited

Question type: Maintenance & Repair

I have a 2003 Jeep Liberty Limited when I start it
my oil light comes on after just a few seconds and
stays on until I shut it off.  I have several codes
running on it, P0300, p0302, P0304, P0305, P0306,
P0155, P0455, my Engine light stays on.

1 Answer


P0155 JEEP - O2 Sensor 2/1 Heater Performance...Possible causes; Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1, Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit fuse, Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 harness is open shorted to ground, Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit poor electrical connection, Faulty Engine Control Module (ECM)...The code means that there is a problem with the heater element circuit of the heated oxygen sensor. The Engine Control Module (ECM) monitors how long it take the sensor to warm up and start sending an adequate signal. The code means the the sensor is taking too long to warm up. Replacing the Front Heated Oxygen Sensor (H2OS) Bank 2 usually takes care of the problem......P0455 JEEP - EVAP System Large Leak...Possible causes; Missing or loose fuel cap, Incorrect fuel filler cap used, Fuel filler cap remains open or fails to close, Foreign matter caught in fuel filler cap, EVAP canister or fuel tank leaks, EVAP system hose leaking, Fuel tank leaking...The P0455 it’s a very common code, because the code is set if the gas cap is loose or missing. Start by tighten the gas cap and clearing the code. In most cases the code can be clear by disconnecting the car battery for about 30 minutes.........I would take care of these problems first as it may effect the misfire codes you have, this po300 code covers the other codes you have....P0300 JEEP - Cylinder Misfire Fault Detected Random Cylinders...Possible causes; Faulty spark plug (s), Faulty ignition coil (s), Clogged or faulty fuel injector (s), Intake air leak, Fuel injectors harness is open or shorted, Fuel Injectors circuit poor electrical connection, Ignition coils harness is open or shorted, Ignition coils circuit poor electrical connection, Insufficient cylinders compression, Incorrect fuel pressure...The P0300 code means that a cylinder(s) is misfiring or is randomly misfiring. Start by checking for intake leaks, intake gaskets are common caused of multi-cylinder misfiring. If no leak are found the next step is to replace the spark plugs. If the problem persist more tests needs to be done to diagnose problem.

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