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2003 volvo xc90 T6 2.9 codes p0300 p0301 p0304. Changed plugs, now codes are P0300, p0301, p0305, P0154 all confirmed, P0134 pending. Found bad vacuum hose, changed it and codes remain. Engine rough

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Posted on Jan 02, 2017

  • 58 Answers

SOURCE: engine runs rough at 40-70mph

have your codes cleared and as soon as your light comes back on get it checked right then. usually the first code that pops up is your problem,. and can cause faulse codes to follow. check your mass air flow sensor,. make sure the breather tube is on good and no cracks or tears in it. check fuel filter also hope this helps you in the right direction

Posted on Mar 10, 2010

  • 496 Answers

SOURCE: P0300 P0301 P0302 P0303 P0304

Have you had somebody clear the codes after you installed the parts.If not the codes have to be erased by using a scan tool.

Posted on May 05, 2012

  • 15 Answers

SOURCE: I got check engine codes P0300,P0301,P0304 on my 2003 Volkswagen Jetta!!!

check the cylinder pressure usely its 75 low or higher .

Posted on Aug 09, 2012

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I got check engine codes P0300,P0301,P0304 on my 2003 Volkswagen Jetta!!!


check the cylinder pressure usely its 75 low or higher .

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Contributing Member
mtl_4runner-2548.gif?dateline=1060047767
Join Date: Jul 2003 Location: Montreal, QC Canada Posts: 8,805 im_aim.gif So you got codes P0300, P0304 and P0305

You need to check primary and secondary resistences, not just primary as you did.
Primary = 0.67 - 1.05 ohms (You may have a bad multi meter if all read the same)
Secondary = 9.3k - 16k ohms Contributing Member
mtl_4runner-2548.gif?dateline=1060047767
Join Date: Jul 2003 Location: Montreal, QC Canada Posts: 8,805 im_aim.gif So you got codes P0300, P0304 and P0305

You need to check primary and secondary resistences, not just primary as you did.
Primary = 0.67 - 1.05 ohms (You may have a bad multi meter if all read the same)
Secondary = 9.3k - 16k ohmsSo you got codes P0300, P0304 and P0305

You need to check primary and secondary resistences, not just primary as you did.
Primary = 0.67 - 1.05 ohms
Secondary = 9.3k - 16k ohms

Jun 29, 2010 | 2000 Chevrolet Blazer

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