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?

1 Answer

250,615

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

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