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Black tape over the TPMS light worked for me! LOL

Removed all 6 fuel injectors and replaced with new fuel injectors. Trying to eliminate that mysterious PO302 engine code.

I have had a po302 and po304 problem for a few months now. Have changed spark plugs, coils and wire and the code still came back. I recently changed the map sensor and so far no codes in a month. It was a cheap part so I tried it!

I have had my 2010 since 2011. Minor parts repair so far, Spark Plugs, Catalytic Converters, Water pump, Serpentine Belt, Wheel Sensors, Brakes, Coils, EGR Valve, Front A Frame Bushings, Upper and Lower Ball Joints, Tie Rod Ends and new Torque Converter.

I have had the same issue with my 2010 Liberty. When it throws the code there has been probably 2 to 3 months in-between. I changed the plugs, coils and wires to no avail. I was thinking it might be a fuel issue. We have been getting some bad gas here! (water).

Waiting to see who has found a fix for this also! My rear breaks wear more than the front brakes and to this day I haven't found out why!

I had replaced my water pump last year with a Gates metal impellor. No problems so far! I had a plastic impellor on the old one.

Sounds like a speed sensor.

I had some what of the same problem plus my cruise control would not work! I found a bad wheel speed sensor bad.

I have been chasing the Gas Cap light, P0456 and the P0455 code for about a week now. Installed a new Mopar gas cap first. That eliminated the Gas Cap light, then when the P0456 code came up I replaced the Evap Purge Valve. The last code to come up was the P0455 code. I replaced the Vapor...

Thanks! I am going to run the smoke test as soon as I receive my order from Ama.

Yes, very first thing I did.

Kept throwing this code for 2 weeks now. It comes and goes. Changed the Emission vacuum pump in the back of the charcoal canister and also changed the gas cap. Was under the Libby and even checked for bad hoses on the back of tank. What next?

We use to change them every tune up years ago. I guess with technology things have changed...

I've changed mine twice since I had my Libby. I currently have 180,000 mile on her. when I removed the PVC valve last time it was clean and rattling. Thanks for the info.

How often do you change your PCV valve? I was talking to a mechanic and he recommended every oil change. I thought this was a little excessive especially when no local auto stores carry it for my 2010 Jeep Liberty with a 3.7 cu. in engine. I had to order 2 new ones on-line. So what say you...

I tried to replace mine last year only to find out they are not replaceable! It seems on my 2010 Liberty you have to replace the whole drive shaft!

I had the same issue on my 2010 Jeep Liberty. I changed the coils and NGK spark plugs and problem solved. The only issue was later on down the road it appears to have moved the problem to the catalytic converters. Changed the O2 sensors with no luck. Eventually I had to change the Y pipe with...

I had a similar problem where the code said evap canister. I replaced the gas cap and code still came up. Found out that my PCV valve was loose in the intake manifold. Tightened it up and code went away. I am not saying this is your problem but just something to look at!