Question about 2004 Hyundai XG350

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What are the probable causes of DTCs P0303 and P0306?

I change all plugs and coils on it. and it still is shaking and vibrating and stalling out. it also won't go past 5mph and I have to keep my foot on the gas pedal to keep it running and while its running it still is shaking and vibrating. I also have a code that said its in limp home mode. can anyone help me figure out what is wrong. I thought it might be the idle air control valve or mass air flow sensor but im unsure.

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The car is in limp mode.
P0303 Cylinder 3 Misfire Detected
P0306 Cylinder 6 Misfire Detected
You need to clear fault codes with a scanner and see if the same fault occurs, if so, check the injectors for those cylinders. Swop cyl 3 injector with cyl 4 injector, if you get a code P0304, the injector is not working, and needs to be checked for a bad connection or maybe the injector is faulty, do the same with cyl 6, swop with cyl 5
Please keep me posted

Posted on Aug 18, 2015

Testimonial: "I clear the codes and now I have a tps code and still the limp home code and still doing the same thing."

  • Geoff Dellow Aug 18, 2015

    What is the code?

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Take a look at the suggestions here.

http://www.obd-codes.com/p0306

http://www.obd-codes.com/p0303

Posted on Aug 18, 2015

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Reason for fault p0303, p0306.


cylinder 3 and 6 misfire thanks for all the info really helps me help you lol

could be plugs coil injector pcm cylinder dmg wiring etc

start by swappin coils n see if problem follows coil or stays in same cylinder

Mar 19, 2014 | 2005 Chevrolet Silverado 2500HD 2WD

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Missing,viborating


Misfire could be a number of things:
a) spark plugs - change them if used over 15K miles - inspect/regap.
b) spark plug wires - change them if over 15K miles - inspect
c) ECM (electronic control module) - test with HEI (high energy ignition) tester.

The vibrating tells me that the engine is running on less than its normal compliment of cylinders - the shaking is produced by the imbalance caused in the engine by one (or more) cylinder(s)
not firing at all.

The "Check Engine" light probably is coming on due the the misfire condition. Go to Pep Boys or
Advance Auto Pats, where they'll tell you (free) your codes causing the "Check Engine' light to be
lit - the code coming from your truck's computer will probably be one or more of:
P0300 - Random/Multiple Cylinder misfire detected
P0301 - Cylinder 1 misfire detected
P0302 - Cylinder 2 misfire detected
P0303 - Cylinder 3 misfire detected
P0304 - Cylinder 4 misfire detected
P0305 - Cylinder 5 misfire detected
P0306 - Cylinder 6 misfire detected
P0307 - Cylinder 7 misfire detected
P0308 - Cylinder 8 misfire detected
P0313 - Misfire detected with low fuel

Jun 23, 2011 | 2009 Ford F-150

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Vehicle missing,shaking,engine light comes on


Misfire could be a number of things:
a) spark plugs - change them if used over 15K miles - inspect/regap.
b) spark plug wires - change them if over 15K miles - inspect
c) ECM (electronic control module) - test with HEI (high energy ignition) tester.

The shaking tells me that the engine is running on less than its normal compliment of cylinders - the shaking is produced by the imbalance caused in the engine by one (or more) cylinder(s)
not firing at all.

The "Check Engine" light probably is coming on due the the misfire condition. Go to Pep Boys or
Advance Auto Pats, where they'll tell you (free) your codes causing the "Check Engine' light to be
lit - the code coming from your truck's computer will probably be one or more of:
P0300 - Random/Multiple Cylinder misfire detected
P0301 - Cylinder 1 misfire detected
P0302 - Cylinder 2 misfire detected
P0303 - Cylinder 3 misfire detected
P0304 - Cylinder 4 misfire detected
P0305 - Cylinder 5 misfire detected
P0306 - Cylinder 6 misfire detected
P0307 - Cylinder 7 misfire detected
P0308 - Cylinder 8 misfire detected
P0313 - Misfire detected with low fuel

Jun 23, 2011 | 2004 Ford F150

1 Answer

Piston 3 and 6 are misfiring the jeep shakes and doesnt accelerate well


Code P0303 and P0306...

A code P0303 and P0306 may mean that one or more of the following has happened:
  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • Defective computer

Possible Solutions: If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.


Hope helps.

May 03, 2011 | 2002 Jeep Grand Cherokee

1 Answer

2006 pontiac grand prix recevied code P0303, changed spark plugs, wires, and fuel injector. Car still shakes and check enigine light is still on. Acceleration is fine.


Spark plugs,wires and injectors, have nothing to do with your problem

PO303 is a misfire on cylinder #3
You may have an individual cylinder coil for that cyl or a coil pack for
several cyl,don't know the engine you have.

You may also have other issues that are causing the shaking

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Vehicle ran low on gas and started cutting off. obd2 reader said p0300,p0302,p0303,p0304,p0305,p0306. multi cylinder misfire changed plugs wires,distributor cap,rotor button,ignition coil,fuel...


Misfires are caused by loss of either spark, gas, or compression. Most likely you have lost gas. Spark is normal? Compression is probably okay. Check your fuel pressure-especially when it has stalled and won't restart.

Dec 04, 2017 | 1997 Dodge Caravan

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Can't pass smog! OBD codes P0303 & P0306, what's my best bet?


SINCE RECOMMENDED TO CHAGE THE PLUGS, WIRES, AND COILS? HAVE YOU DONE SO? OR EVER?

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