Question about 2003 Saturn VUE

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Whats misfire po300 po305 po306 - 2003 Saturn VUE

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Miss firein engine ,, possibly cyclinder 5 and 6.... most likely coil pack

Posted on Nov 24, 2013

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Posted on Jan 02, 2017

ZX2Fast
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SOURCE: trouble codes for saturn ls2

P0300 Multiple Cylinder Misfire Detected

P0306 Cylinder 6 Misfire Detected

P0451 EVAP Pressure Sensor Range/Performance

I have no idea what those last two are. Typo, maybe?

Your first two codes could be caused by old spark plugs and/or leaking plug wires.

Your EVAP code could be a bad fuel tank pressure sensor or a malfunctioning EVAP system. With that code, if you remove your fuel cap and get a whoosing sound, then it is an issue with your EVAP system not properly venting the tank. If you don't get that sound, then the tank pressure sensor is bad.

Posted on Mar 05, 2010

  • 14585 Answers

SOURCE: 2004 Saturn, "L" series, 3 liter V-6. po300,

300 is random misfire and 306 is cylinder #6, I would check the coil pack on #6. If it has separate coils per cyliner, swap the coil, see if the misfire goes to that cylinder. If it does replace the coil.
If it has three coil packs you can still swap the coils. If that doesn't fix your problem, then you will have to check the injector with an ohm meter. resistance between the prongs should be between 11 to 15 ohms. check another injector and they should be relatively close. Let me know
Good luck
Randy

Posted on Nov 09, 2010

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Codes PO300-PO305 TCS and emission lights on, runs OK except sl rough at lower speeds


you have multiple misfire po300 and cylinder 5 po305 misfire.the misfire is causing the rough running.The computer has disabled your traction control.You either have carbon in the EGR which simulates a vacuum leak,bad spark plugs,a leaking intake manifold,or low fuel pressure from a bad pump or clogged filter.
i would start with the spark plugs and fuel filter

Apr 21, 2015 | 2001 Honda Odyssey

1 Answer

2003 acura tl error codes po301 po302 po304 po306 p1399 po300


PO300 and P1399 are random cylinder misfire detected.
PO301 cylinder 1 misfire
PO302 cylinder 2 misfire
PO304 cylinder 4 misfire
PO306 cylinder 6 misfire
I would say that you have damage to the ignition wiring harness or you ECM is failing.

Feb 17, 2015 | Acura Cars & Trucks

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Multiple engine codes PO300, PO303, PO306. what is going bad on this 2005 kia sorento?


I've had similar issues. The fix I used was to take my vehicle to AAMCO and let them run a diagnostic check. Most often it will be at little or no cost and, if you don't want to mess with the fix anymore, they can fix it onsite.

Sep 07, 2014 | 2005 Kia Sorento

1 Answer

99 ACURA CL 3.0 FAILED PO302 MISFIRE PO303, PO304, PO305, PO306, & PO300 RANDOM/MULTIPLE CYLINDER MISFIRE DETECTED


If a tune up (spark plugs, ignition wires, distributor cap/rotor button or coil packs) don't work, try checking the fuel system.

Nov 05, 2013 | Cars & Trucks

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I have a 2006 mercedes c230 sport. It is misfiring on cylinders 4 5 and 6 could it be an oxygen sensor? if so up stream or down


If the c230 has a misfire it may be a bad ecu or M.E. control unit. There is a company that can test it in Michigan.
Mercedes Ecm Repair

Jan 28, 2013 | GMC Yukon Cars & Trucks

1 Answer

2000 Lexus GS300 I have codes po300 po302, po303, po304, po305, po306,po171


We can't help you here

You need the car diagnosed

I doubt you have lifters,should have
OHC valve train

Most likely the oil passages are clogged up
in the cams with sludge

That's what happens when the wrong oil
& too long between changes takes place

You ruin the engine

Dec 23, 2012 | Cars & Trucks

1 Answer

What's your problem? my 2004 mercury monterey has eight codes ,po301,poo53,po106,po316,po300,po304,po305,and po306


PO 300 is multiple misfires detected
PO 301, 304, 305, 306 are misfires in cylinders 1,4,5,&6
PO 053 is HO2S Bank 1 Sensor 1 Heater Resistance
PO 106 is MAP/BARO CKT Range / Perf
PO 316 is Misfire detected 1st 1000 Revs.

On a misfire, I usually push towards the spark plugs, plug wires, and coil packs / distributor coil.
You have PO 106 and PO 053 that need to be inquired about at nearest AutoZone.
They can give you an idea as to what is the problem on these.

Did a MAP sensor **** out and cause all the misfires ?
Did a misfire cause the MAP sensor error?
You see what I'm saying ?...Something caused all the misfires...thinking MAP...but not that familiar with the function of the MAP.

Hope this helps...

Aug 13, 2011 | 2004 Mercury Montery

2 Answers

I have 1999 318 4x4 dakota with fault coads


These are misfire codes.This means that your vehicle is missing.The 300 is a random misfire and the 305 is for cylinder 5,and the 306 is for cylinder number 6.Check the plugs if they are good then you could have bad coils.They are top of the plugs.Hope this helps.Good luck.

Feb 25, 2010 | 1999 Dodge Dakota

1 Answer

The durango 1999 is giving a PO300 and PO305 & PO306 codes it has new plugs new distributor cap & rotor,the wires look good ??????


The vehicle can misfire for many different reasons. Your first step should be to check to make sure the spark is getting to the spark plugs. Next make sure those cylinders are getting fuel. If all those check out then you will need to check for compression loss. All of these procedures and more can be found at www.autozone.com

Oct 28, 2009 | 1999 Dodge Durango

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