Question about 2001 Hyundai XG300

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Po306 po304 po300check engine light on how to fix problem

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All trouble codes you have are miss fire codes p0304 #4 cyl p0306 #6 cyl p0300 random miss fire sounds like you may have bad spark plugs,wires,or coils

Posted on Mar 31, 2010

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I have check engine code P1354 variable valve timing system bank 2 for my 2000 Lexus RX300. Where is this located?


YES, you have to investigate what is throwing your valve timing off. That could be anything from a vacuum leak to clogged injectors, bad plugs, sensor ect. Have the car analyzed to find the cause. There can be many causes. Good luck

Mar 22, 2017 | 2000 Lexus RX 300

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

2 Answers

How to fix diagnostic code for 1999 vw passat po304 po305 po306


Hi. You have misfires on cylinders 4, 5 and 6. If there are no faults on cylinder 1, 2 and 3 then I would check the power to the left bank injectors. Also check spark plugs and ht leads. If there are running issues then this should be an easy fix. If the faults are very intermitant then it can be a bit tricky to isolate.

May 18, 2014 | 1999 Volkswagen Passat

1 Answer

How to fix diagnostic code for 1999 vw passat po304 po305 po306


Does it have a 2.8? There is a bulletin pertaining to updated ECM if the number is the same as bulletin. Now that is if the basic tune-up parts are good. What those codes are telling you is, that cylinders 4,5 & #6 are misfiring. So if it is over 100,000 miles, I would have a tune-up done first, because an ECM will be expensive.

May 18, 2014 | 2001 Honda CR-V

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

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

The engine hesition sometime 04 expedition 5.4


Most likely you have a bad COP (Coil On Plug) .
Maybe more than one. Very common ford problem for last 12 years.
If you get a MIL Light on the dash (the wrench),check for a PO300 Code.
A PO304 would be coil #4,PO306 #6 Etc.
Cyl 1 thru 4 on pass side
Cyl 5 thru 8 on driver side,front to back

Also hills cause a hi engine vacuum and thus a possible EGR Valve going bad. You can unplug the vacuum lines and plug, to diagnose that issue.

Also leave the EGR disconnected if your working on coil issues. Just note the MIL light will stay on all the time,and remember to check your 300 codes if you feel a hesitaton or miss.

Jul 28, 2010 | 2004 Ford Expedition

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