Question about 1999 Buick Regal

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P0300 code misfire p0303

Just code 0303 only change spark on front getting ready change went away month a half show again today same code as before

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# 3 cylinder misfire (PO303) if code is
actually correct for your problem,nothing
to do with spark plugs,ignition problem

Posted on Jul 10, 2013

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Posted on Jan 02, 2017

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Check engine light came on last week. They said it was the heated oxygen sensor. I had it replaced and today the light is on again. The code at Auto Zone is P2096 and P0300. It says P0300/P0301/P0302...


Yes a misfire could cause a false 02 code. As far as why it's misfiring could be a plug and wire issue but hard to say without looking at it

Oct 23, 2013 | 2006 Kia Rio

1 Answer

Trouble code: p0300 I have only had it for about


That code is showing that one or more of your cylinders aren't firing properly, or better known as misfiring.
This could be caused by a myriad of different things such as faulty spark plugs, ignition coil, clogged fuel injectors, possible improper fuel pressure, intake air leak, or not enough cylinder pressure-
There's also the possiblity that you could have some shorts or poor electrical connections between the ignition coil and/or fuel injector harnesses.
The handheld code reader that we all have can give you an idea of what it is by giving you the code...but take it to a mechanic who has a diagnostic machine and they'll be better able to pinpoint the exact issue.
Hope this helps.

Aug 07, 2013 | 2005 Chrysler 300

1 Answer

1998 buick century code p0420


code p 0420 refers to cat converter system bank 1---efficiency below threshold====causes ---cat converter---wiring---HO2S (heated oxygen sensor, the one in the exhaust manifold before the cat converter)
code p 0300 is random misfires
I would suggest changing the HO2S as it reports to the ECM on exhaust content so that the ECM can adjust the air/fuel ratio
so it is logical that if that unit is not reporting correctly, the cat converter may be having trouble burning off the gasses correctly
The oxygen sensor(O2S) reads the results of the cat converter operation and helps fine tune the ECM settings

Mar 10, 2017 | 1998 Buick Century

1 Answer

I have a 98 silverado with a multiple misfire im getting a p0300 code ive replaced evrything except for the coil and o2 sensors.


MULTIPLE MISFIRE CAN BE CAUSED BY.CLOGGED FUEL INJECTORS.ADD A CAN OF SEAFOAM TO A 3/4 TO FULL TANK OF GAS.CHANGE FUEL FILTER, IF ALL READY CHANGED SPARK PLUGS AND WIRES.A WEAK FUEL PUMP AND A CONTAMINATED MASS AIR FLOW SENSOR WILL CAUSE LEAN MISFIRE CONDITIONS.

Mar 13, 2011 | Chevrolet 1500 Cars & Trucks

1 Answer

I Have a Chevy 2007 HHR engine 2.4 Lit. and the scaner show code P0300,I changed spark plus and erase computer, but after a few miles the code come back again. This car has about 62000 miles. Can you held...


P0300....Random/Multiple Cylinder Misfire Detected

i would suspect either the coil pack or the leads ,also make sure spark plugs are set to 25 th as too wider gap could cause this problem as well

Mar 01, 2011 | Chevrolet HHR Cars & Trucks

1 Answer

Fault code p0300 had my sebring diag today and this is what the results said p0153 and p0300 oxygen sensor and #3 cyl misfire


Any time there is a misfire condition in an engine the o2 code will pop up,so you need to correct the misfire and that code will go away.To repair the misfire i would first try a new spark plug and then the coil for that plug.It could also be a faulty injector on that cylinder but that is not common,go with the plug first.note;all the plugs are the same age so if this is your problem,replace the rest also.

Mar 24, 2010 | 2008 Chrysler Sebring Convertible

2 Answers

Code p0300 replaced coil spark plugs and coil cover 2000 2.4 cavalier rpm up and down while ideling


The code is a mis-fire code. This code does not tell you which cylinder is mis-firing.
Here is a list of other items to check :

- O2 sensor
- Catalytic converter
- EGR valve
- Cam sensor
- Bad computer

Please let me know what you find.

Feb 07, 2010 | 1996 Chevrolet Cavalier

2 Answers

P0300 diagnostic code read on my car today, but didnt specify where it was coming from, the machine that reads the codes didnt feed from my car to the computer


I have a 2000 Oldsmobile Alera that has a diagnostic code p0300 random misfire, runs very bad change- ignition coils- spark plugs and boots for plugs. change catalytic converter, and fuel pressure is 50 to 60 lb. And my car still runs the same, HELP HELP HELP!!!!!!!!!!

Dec 23, 2009 | 1998 Oldsmobile Cutlass

1 Answer

Misfire of the #3 cylinder, 4.3 6 cyl


R THEY WIRED CORRECTLY,WITH THE SAME GAP??

Aug 17, 2009 | 1999 Chevrolet S-10 Pickup

1 Answer

2000 dakota 4.7 v-8 codes p0300 p0303 p0304 p0307


well the codes
p0300 multiple misfire
p0303 misfire cylinder 3
p0304 misfire cylinder 4
p0307 misfire cylinder 7

can be alot of things check cylinders for compression is what i would do first..

Jan 31, 2009 | 1997 Dodge Dakota

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