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post #1 of 8 Old 04-26-2007, 07:20 PM Thread Starter
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Thumbs up Prius misfire problem

I've just joined the forum (1st timer) and am in desperate need of help.

I have a Toyota Prius and have recently encountered a problem. The OBDCII code is a p0301 which indicates a misfire in cylinder 1. Now that I know this how do I resolve this issue. The only background I have is the day before I filled the tank with gas (SHELL - 87 octane). Is it possible I got some bad gas? Can any one recommend a fix or remedy to this problem before I have to head in to the dealer (which I'd rather not do).

Any help would be appreciated.

Thanks in advance.

Last edited by don morgan; 04-27-2007 at 01:54 PM.
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post #2 of 8 Old 04-26-2007, 11:59 PM
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hmm... it's possible that it is bad gas.

Did you wash the engine compartment before?
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post #3 of 8 Old 04-27-2007, 07:02 AM Thread Starter
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No, I didn't wash the engine compartment. I just filled up my tank and the next morning I get this knocking and hesitation when I have the vehicle in park. When I put it in drive the knocking stops, although as I begin to accelerate the knocking/ hesitation begins again. Then I get the P0301 - misfire diagnostic code for cylinder 1.

Is there a repair protocol for diagnosing this condition?

Would it be wise to put an additive into my gas which removes any potential water?

What else could be the reason for this misfire condition?

Don
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post #4 of 8 Old 04-27-2007, 11:20 AM
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hmm... this is definitely out of my area of specialty.

Try PriusOnline (.com). Danman32 over there and tochatitu (sp) will be able to assist you better.
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post #5 of 8 Old 04-27-2007, 01:51 PM Thread Starter
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Fyi -

Just to close the loop.

1) I had calledthe dealer regarding whether or not to use additive. He suggested to add the HEET ( water removal additive ) to the gas as he strongly felt it was bad gas causing the problem. so . . .

2) I added the the HEET

3) Then drove around on the freeway to get a good mixing in the tank

4) The hesitation / knocking actually got much worse before it got better. Apparently took awhile before all the moisture was removed from the tank.

4a) As I was driving about, I left the OBDC II scanner connected to monitor the progress. It turns out I logged several more misfires ranging from P0300 , P0301, P0303, P0304, P0380. The P030x (x = 1, 3, 4) refers to misfires in the corresponding cylinder. P0300 refers to randomn misfires. P0380 refers to high voltage on O2 sensor. All of these errors were expected since I was burning trash gas.

5) Bottom line . . . It took one bottle of HEET and some scenic driving around (30 minutes at various speeds) to remove the water from the gas. So now I'm back in business.

Thanks alot for all the help - didn't get the chance to contact danman32 - I'll save the info for my next problem.

Cheers, Don
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post #6 of 8 Old 04-28-2007, 11:50 AM
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glad to know your issue has been solved!
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post #7 of 8 Old 02-18-2008, 05:44 PM
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Another Prius with misfire problem

My Prius had the check engine light come on - and it had set 5 codes: each cylinder misfire, plus random cylinder misfire. It still gets 40+ mpg, but it does knock at times. I've read about two possibilities: bad gas and bad coil. Any advice of what to do to tell if it is the coil?
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post #8 of 8 Old 11-27-2018, 09:54 PM
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05 Prius P0301/2 Misfire

Thanks to all for stepping up to help. I have a similar problem:
I have a recently purchased 05 Prius with 219kmi. It has thrown the CEL with codes for misfire on P0301 and P0302. I replaced #1 plug and swapped the #3&4 COP with #1&2, cleared the codes. After 30 minutes, the codes returned, the issue did not move to 3&4 as I expected. The removed plug was clean and brown as expected. I sprayed starting fluid around intake to test for a leak near 1&2 with no positive result. Main battery was replaced 4yrs ago with OEM and 12v battery changed Aug 2018. No ther tests were conducted.
I Paid to have codes read by a reputable garage who confirmed the codes, tested the injectors-o.k. and declared the wiring harness o.k. Saying to replace the COPs and plugs; maybe have a compression test done.
So, why didn't the problem xfer to 3&4 as expected? with 1&2 still showing misfires I suspect the harness or connectors. I can buy a compression tester and test if needed. Thank you for any info you can provide.o you can provide.

Last edited by larrycj; 11-27-2018 at 09:56 PM. Reason: added thanks
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