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Most common problen jeep wrangler 2003 2.4 l engine light on

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There are hundreds of things that can trip the check engine light, some so simple as a loose gas cap. Your best bet is to get your jeep scanned for free at a local auto parts store, such as autozone. Usually they will scan your code, and tell you what the most likely cause of the code is. Then you can make a good decision as to what needs fixed!

Posted on May 08, 2010


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2003 jeep wrangler temp guage keeps going up and down.the check gauge light goes off and on. appears to be overheating

It sounds like you need a new thermostat. Have a trusted mechanic replace your thermostat, shouldn't cost more than $20-30. The thermostat is located in your thermostat housing on the engine and is connected to the Upper Radiator Hose. Remove the 2 bolts and change the thermostat.

Oct 07, 2011 | 2003 Jeep Wrangler

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2003 jeep wrangler just bought it when we test drove every thing was fin when i got it home the trans. light indicater came on does not go off jeep run great it is 4 wheel dr.

That's a common occurrence when buying a used car. The seller will clear the trouble codes, knowing they won't come back on for a while. And, being the honest upright citizens they are, they just forgot to tell the buyer there was a problem. You'll have to have the computer scanned to find out what the check engine light is for. At least I think you are referring to a check engine light on the instrument panel and not the light that tells you when the 4wd is engaged.

Jan 26, 2011 | Jeep Wrangler Cars & Trucks

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1994 jeep wrangler will turn over but wont start check doesnt come on at first if you let it sit 10 min or so the check engine light will finally come on and it will start and as long as check engine light...

Your engine computer is going bad. There are three capacitors inside the ecu that are going bad, unable to hold current. You can replace the entire ecu or try and change out the capacitors in your ecu. It's a common problem with early 90's jeep ecu's.

Jan 03, 2011 | 1994 Jeep Wrangler

1 Answer

The check engine light has come on in a 2003 jeep wrangler, the code is 303.... What does this mean?

a p0303 is a cylinder number 3 misfire, which means that the computer is reading that the number three cylinder of the engine isn't contributing as much power as the others. usually is just a tune-up issue, i would suggest checking or replacing tune-up components. that will usually handle it.

Dec 10, 2009 | 2003 Jeep Wrangler

1 Answer

2004 wrangler chek engine light on. Code

a fuel cap indication would mean a leak not nessesaraly your gas cap, id check the fuel neck vent hose for a leak

Nov 04, 2009 | 2003 Jeep Wrangler

1 Answer

Getting code P1022 when checking onboard diag. chek engine light also on intermitt 03 jeep wrangler 6 cyl 4X4

that is an injector problem.injector # 2 is letting out a high output.this could be there is a bad connector or a damaged wire.this will affect the way your injector reacts and will cause the check engine to go on and would need an injector tester to check the spray pattern for your injector.

Oct 04, 2009 | 2003 Jeep Wrangler

1 Answer

2003 jeep wrangler: all exterior lights went out except for headlights and fog lights. Dash lights also out.

Have you checked the fuses?

Headlights are usually on a fused link or fused differently than the rest of the lights. Fog lights are an option, so they would have separate wiring. All other exterior lights sounds like a fuse.

Aug 29, 2009 | 2003 Jeep Wrangler

1 Answer

2002 Jeep Wrangler 4.0 When Driving the Engine Dies

You need to do a code check. if no codes, check fuel supply (pump and filter) Quick way to isolate problem to either fuel or spark is to spray carb cleaner into intake while cranking. If engine starts, then it's fuel...If not, then I'd suspect spark...common problem there is crank sensor, but don't replace it without testing first!!!

May 14, 2009 | 2002 Jeep Wrangler

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