Most states that impose vehicle emissions, as part of the state inspection for the vehicle, will detect if the computer has recently been reset and fail the vehicle until the computer is ready. This can cause less fuel efficiency, operational problems and damage to other components down the line. Jeep JK Wrangler; Check Engine Light, No Code, "ECO" indicator stays off; ... Liberty is a well-armed lamb contesting the vote. In addition, while the computer is relearning, fuel-to-air ratio will not be monitored. Service Engine Light– Often, this is the only symptom of the Jeep Liberty P0420 code. Most of the time, that serious problem is a misfire. But an O2 sensor code will surely show up in a … While a majority of the time, the flashing check engine light is going to be caused by a misfire related to your Liberty’s ignition system or fuel system (as stated above), there are other issues that can cause it. Turn ignition on off 3rd time, code reader says done, no codes come up 2008 Jeep Liberty Sport 4WD Here are the most common issues that end up causing the check engine light to flash. However, erasing the codes does not fix the problem. Plug the pocket scanner into the DLC and then turn the ignition key to the accessory position. Related: P0442 Jeep Liberty . The ignition system is the most common reason that the check engine light will flash. Step 1 Open the driver's side door of the Jeep Liberty and locate the diagnostic link connector (DLC) under the dash. But, follow the OBDII codes. Most will feature a few options on the menu that you can scroll between and press an enter key to activate the function. The most recently reported issues are listed below. There are many things that can cause the P0420 trouble code in your Liberty. Joined: Oct 5, 2004 Location: Near Indy. The 2012 Jeep Liberty has 4 problems reported for check engine light on. It could be a more serious mechanical issue, such as as bent valve, bad lifter, etc…. This raw fuel can detonate, which causes damage to the catalytic converter and the exhaust system itself. Please also check out the statistics and reliability analysis of the 2010 Jeep Liberty based on all problems reported for the 2010 Liberty. Average repair cost is $1,720 at 87,100 miles. Good luck! The computer in your Liberty is self-diagnosing; and when you clear the codes, it simply goes through a relearning phase. Pocket scanners have dropped in price over the past few years and are widely available and quite handy for the do-it-yourself mechanic. Blinking Check Engine Light Diagnosis: Jeep Liberty There will always be trouble codes associated with the check engine light blinking. A problem has to repeat itself several times before the Grand Cherokee's On-Board Diagnostic system will give it a "fault" status. ), and it was. On some models, there may even be an "Erase" key. And the tricky thing with the O2 sensor is that the car will continue to drive well so you might want to dismiss the light. EGR- The EGR system recycles burnt exhaust gasses back into the combustion chamber. Jeep Wrangler JL Showcase. These parts work in concert to ignite the fuel in the combustion chamber at just the right time. Keeping in mind that any engine needs air, fuel, and spark for ignition, your Jeep Liberty’s fuel system can often cause the engine to misfire. Most of these places will offer to scan and clear the engine codes for free. This will power up all the electrical controls without the engine running. Top Causes of P0420 in the Jeep Liberty. Once a Jeep Grand Cherokee's check engine light illuminates, it means the On-Board Diagnostic system has repeatedly detected an engine malfunction. The scanner will get its power from the battery in the Liberty and will not require being turned on. There can be other situations that can cause the check engine light to blink as well. It is located to the right of the steering wheel on the Liberty. These trouble codes will be able to tell you where to start hunting down the problem. You should never clear a code without properly diagnosing what the code is and having it fixed. If you drive a JEEP Wrangler JK, you can check engine fault codes by inserting the key into the ignition and turning it 3x to the run position without starting the vehicle. Most vehicle manufactures also have their OEM cod… You can also bring the Liberty to an auto parts store or neighborhood repair facility. One problem related to check engine light on has been reported for the 2010 Jeep Liberty. Jeep check engine light (CEL) comes on when the On-Board Diagnostic (OBD) system detects a problem with the engine, transmission, or evaporative system. 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