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P0300 code What causes p0300 code for 2002 saturn sl

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You have engine misfire you need check your spark plugs if they be ok. need check yours ignition coils

Posted on Mar 21, 2014

Testimonial: "I recently changed plugs and ignition module. Engine still misfires but code comes up now for bank 1 sensor 1. I previously changed the upstream and downstream o2 sensors. Also checked wiring and for vacuum line leaks. The skip goes away when I sprayed carberator cleaner in the air box. Seems to be lacking fuel for some reason."

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  • Reyes Juarez Mar 23, 2014

    check your fuel pump pressure and change the fuel filter

  • Brian Dionne
    Brian Dionne Mar 23, 2014

    Fuel filter changed with no success.

  • Reyes Juarez Mar 24, 2014

    check your fuel pressure regulator

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have a furl pressure test done to check for pump/pressure regulator / filter problems . Also check the canister purge valve solenoid and check for correct venting of the tank. Check that the filler cap is on correctly and tight.

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A P0300 code indicates random, multiple misfires were detected. You eliminated the possibility of ignition system faults by replacing the ignition module, the coils, and the spark plugs (unless the replacement part(s) were no good). However you did not mention the ignition wires which are another probable cause. In addition, there could be vacuum leaks due to damaged hoses or improper routing. Consider also fuel contamination or a problem with the fuel system.

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I have a SC1 Saturn - the service engine soon light has come on - I took it to a local garage they put it on the computer and said it may need plugs and wires or sensor of some sort. This morning on my...


sounds like it could be a bad ignition module
this is what supplies spark to the spark plugs-it is very common on the s series saturns-the bolts that mount it through time stretch out and moisture gathers underneath the module which in turn causes corrosion-then starts to restrict proper spark to the plugs-if the code pulled is a cylinder misfire code(p0300,p0301,p0302,p0303,p0304)i would suggest replacing the module,plugs,wires, and the mounting bolts.
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My check engine light on my 07 saturn ion keeps coming on and gives the code p1174 and p0300 what do they mean and how do i fix


1174 is a lean code, and would have to been set first because it will not set when the 0300 is there. 0300 is a random misfire, because it read after the lean code, it was probably caused by the lean condition. 1st check for vacuum leaks from hoses or intake gaskets, you cal listen for a hissing sound, or spray carb cleaner around intake systems, a change in rpm will be noticed when spraying near a vac leak. other probable causes are the upstream 02 sensor, map sensor, or fuel delivery problems. does the vehicle idle porly, or does it miss at the top end?

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My 2005 saturn ion has a p0300. i changed the ICM and it worked for a while but the same problem started again.


Generally I have found that when this code or one ending in another number (example P0304) can mean that the coil pack is bad. When I get the code that's what I usually had to replace. Here is a website that may help you out ....

http://www.obd-codes.com/p0300

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