Question about 2007 Lexus RX 350 FWD

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Check engine and vsc light on... took vehicle to auto zone for diagnostics and got P0300 and P0356 error codes for left down-stream sensor located after catalytic converter. Suggestions please.

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  • Jeremy W.
    Jeremy W. Oct 13, 2010

    P0300 - random/multiple cylinder misfire
    P0356 - ignition coil primary circuit failure.

    None of those have anything to do with the O2 sensor. I know Toyota has a TSB on ignition coils going bad but since there isn't a specific cylinder or cylinders I'm not sure that code is accurate.

    Have you replaced the spark plugs recently?

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Posted on Jan 02, 2017

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SOURCE: check engine!

normally you need to change the converter if you have smog test you have no choise if not disconnect the battery for a minute and try it out hopefully it will not come back hope its a fixya thanks for the post pierre

Posted on Jul 31, 2008

  • 39 Answers

SOURCE: 2000 lexus es300 error code p0440, p0441, p0446

P0440 Evaporative Emission System, P0441 Evaporative Emission System Incorrect Purge Flow , AND P0446 Evaporative Emission System Vent Control Circuit

Posted on Apr 23, 2009

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SOURCE: LS430 check VSC light on after check engine light on

My car (06 GS430) began giving me more frequent "Check VSC" warnings. (Code P0455 in my case. Really glad I bought that OBDII tool--resetting the codes is a snap!)

I knew that a loose gas cap could cause this, so normally I just give it a twist and it tightens. Now I found that no matter how many "clicks" I tightened the gas cap, it would not cinch down snug. The lightest turn the opposite way would open it.

I was all set to head over to CarQuest for a replacement filler cap. But I thought I'd inspect mine first just to see why it stopped holding. Upon inspection, I saw that what holds the cap in place is compression of the rubber O-ring at the back of the cap, which compresses against the filler neck. That apparently was no longer happening.

I carefully removed the O-ring from the cap--using screwdrivers to lift it over the edge of the groove it sits in. Like removing a bike tire from the rim--work your way around. Then I cut a strip of electrical tape about 10" long, and 1/4" wide. I wound this into the curved groove where the O-ring normally sits, just to build up a little thickness. Put the O-ring back in place. Done.

Now the cap tightens like it's supposed to, and thus far, it has stopped the VSC error codes. Don't know if it will fix your issue or not, Good luck.

Posted on May 09, 2009

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SOURCE: check engine light subaru forester 03

try ebay or used i would just replace the one downstream one frist

Posted on Jul 19, 2009

  • 1 Answer

SOURCE: 07 lexus rx 350 with check engine light code p0304

Hi, did you ever get an answer? I have the same issue. Thanks.

Posted on Apr 29, 2010

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