Question about 2002 Toyota Prius

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P3191 and P0300 fault codes on a 02 Prius

I have a 02 Prius with 154,000 miles on it and I have been having a problem recently since winter has begun. I know what the codes are, but what I don't know is if a black residue on the outside of the coil tube where the rubber boot and housing meet is an indication that the coil pack is leaking. I found this when I was changing the spark plugs. Since changing the plugs, I am still having the P3191 (engine does run, but stalls afterwords creating the code). I haven't seen the P0300 appear, so I am not sure if the coil packs are at fault. Thanks for any information you can provide.

Posted by Anonymous on


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Posted on Jan 02, 2017

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SOURCE: Flashing Check Engine Light 99 Camry

light flashes when comp. picks up a skip pull code and it will be po300 random miss p0301 p0302 p0303 p0304 all are for that # cyl that has the miss best bet change wires and plugs check for oil on wire to plug end in spark plug hole leaking valve cover gasket or spark plug tubes...

Posted on Dec 31, 2008

  • 1861 Answers

SOURCE: 99 4runner po302 code

Yes. No clicking indicates a bad injector; you mentioned you had a Noid light; does it pulse?

If you remove the plenum to replace the injector, buy new plenum gaskets. You should not reuse them.

The graciousness of a FixYa rating for my assistance would be appreciated.

Posted on Jan 02, 2009

  • 1861 Answers

SOURCE: check engine light is on the code was po300

I respectfully disagree.
A P-0300 will NOT be set in a Corolla by a dirty fuel filter.
Replacing the fuel filter could be a very costly operation, as I have observed that the fuel line threads that connect to the fuel filter easuily get damaged when removing the fuel filter.

In short, don't replace the filter until you are SURE that it is the culpit.
In this case, the fuel filter is NOT the culprit..
Save your money; and your time.
Additionally, premium fuel does not clean fuel injectors. That expense would be a waste of money. The engine will actually run WORSE on premium fuel; the engine is NOT designed to run on premium. 87 or 89 (better choice/89) is the grade to use.

If you really want to track down the P-0300 code, which is a multiple/random cylinder misfire, I would look at the quality of the fuel in the car; ie water in the gas. Second, I would remove the plugs and examine them closely. A worn center electrode will also set the P-0300 code, as will bad/weak plug wires (over 5 years old).

Please feel free to contact me back if you need further assistance. Thanks for choosing FixYa for assistance.

Posted on Mar 05, 2009

  • 125 Answers

SOURCE: 2000 Toyota 4 Runner, 3.4L, 6 Cylinder. Engine

look at the plug wires they are known to bust when old near the boot

Posted on Apr 30, 2009

  • 142 Answers

SOURCE: I am working on a 1998 Toyota 4-Runner. I changed


Posted on Jun 27, 2009

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