2003 Jeep Liberty 3.7L V6 Check Engine Light

Asked by Jul 15, 2017 at 06:05 PM about the 2003 Jeep Liberty Renegade

Question type: Maintenance & Repair

I checked the the engine light codes on my 2003 Jeep Liberty 3.7L V6,
because vehicle was jerking, by turning ignition on/off 3 times without
starting and P code 0305 displayed (firing order number 5 was not working
so i took coil off while vehicle was running and no change).  So it had been a
while since I changed all my spark plugs and coils so I did that.  Jeep ran
good for about 100 miles the light came on and vehicle began to jerk again.  
So I took it to Autozone and they asked me did I have the check engine reset
after installing plugs and coils. I said no, so they went out and reset the
engine light and the misfire went away.  So is it standard procedure to reset
check engine light after installing parts causing vehicle to misfire?

5 Answers


Not how it should work. The CEL should not have come back on after the repair if that is what it was, like a plug or coil in your case. If it did come back on, you have another issue. The fuel injector on the cylinder might be the issue, etc. Read this as probably causes, there are more than a few....https://www.obd-codes.com/p0305

My 2003 jeep liberty goes into limp mode after 100 miles as well. It shows a random misfire code but when I restart the car it runs great for another 100 miles. I have replaced the plugs, coils, and Engine control module. It continues to do the same thing goes into limp mode every 100 miles. I am in the process of replacing the 4 oxygen sensors and if that does not work I may replace the full injectors. Any other solutions are greatly appreciated.

Hello Sir, I was wondering if you ever found out the answer or the diagnosis on the situation with your vehicle

Hello Sir, I was wondering if you ever found out the answer or the diagnosis on the situation with your vehicle

I replaced the Sensors on my exhaust and the engine light continues to light up. I am now going to focus on my fuel injectors. The car continues to run great until it goes into limp mode. Then I just turn it off and restart it and it runs great immediately. Any other ideas for a solution would be very helpful and appreciated.

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