Question about 2003 Dodge Durango

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I have a 2003 dodge dorango and the check engin light is on i had it check and the code is 456 emmision what is this and how do I fix this problem

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Thats the evap system

Posted on Jan 24, 2009

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456 is a small evap leak check hoses to evap canister by fuel tank.

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You cannot make the check engine light go off by replacing or removing a fuse. You need to fix the problem that is causing the light to come on. It might be as simple as replacing the gas cap. I would take the car to AutoZone or another auto parts store and have the trouble codes read. The store will usually give you a printout of possible problems associated with the code(s). If you want to spend the money you could buy a code reader and read the codes and then clear the codes which will cause the check engine light to go off for a short time (maybe long enough to get theemission test done if you're lucky!).

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You mean check engine light? If so, the P0456 code is an emmisions leak code. You will need to take the vehicle to a qualified repair facility and have them run an emmisions leakage test on it.

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04 dodge ram pickup has code po 456 what is this code? 04 dodge ram 1500 5.7 engine gas mileage has gotten worse.


Small leak in evaporative emissions system. Basically takes fuel vapors and recirculates them back to engine to be burned rather than vented into the atmosphere.One common cause of light on dash is faulty/dirty gas cap seal. Did you add fuel just before light came on? Otherwise a small leak at a hose etc., in system, as well as faulty purge system may also cause it.

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Have the vehicle smoke tested and repaired,they will reset the check light

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1 Answer

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P0456 is Evap Emission control small leak detected.
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The first code could be related to a loose, defective, or missing gas cap.
The second code, could be a defective sensor but you will need to confirm. Check oil level and condition first then onto the sensor and related wiring.

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My 2004 dodge neon had it's check engine light come on the codes that came up are P442 and P456 what do they stand for?


they are for evaperative emmisions leaks.usually its a loose gas cap that causes these codes they are small leak codes.check gas cap, give it a couple of turns more to be sure its tight.
the car has to make 3 consecutive trips that detect no leaks before light will turn off.each trip has to start with a cold engine gas level between 15% to 85% of full.
or clear codes with code reader and drive car as usuall. if a leak is detected twice then the light will come on again.if it does then you will need to look for cracked vapor hoses,leaking canister etc

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I have a 2003 saab 9-3 2.0t and my engine light came on, and i dont know what to do, im not very good with cars, please help


This indicates a malfunction within the engine control computer which operates and monitors many functions of the engine,transmission and emmision control devices.At this point you should have diagnostics ran to where a technician will interface your vehicle with a diagnostic computer and retrieve trouble data set by your computer as these codes are stored.Sometimes these are fairly non-detrimental trouble codes which may only take a reset for instance fuel emmision codes set as a result of a lose gas cap.

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I would start with a test drive with a fuel pressure gauge on it make sure you have spec. 35 - 40 psi. Clear codes and record all the freeze frame data in obd2 as you will need this in the diag process. 442 and 456 are evap codes I believe, do they return with the 300 misfire codes? Either way you need to reproduce the problem with the gauge on it and get the first code it sets. Could be fuel pump/filter/sending unit assy. In this case you will need to pay attention to the fuel level when this occurs. (same level as before)

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2003 dodge caravan


To check the code for the engine light without OBD tools for dodge caravan is to switch on the key 3 times without starting the car and you will see the code displayed on the Odometer display. Then check for the document what king of engine problem for that code.

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