Error Code: P0302/P3191

There is a problem of some sort that is triggering this code. More than likely a low voltage 12v battery because it sat without running for two weeks? You more than likely have the intake manifold issue that many Prius cars have? I would take it to another dealer because I think you got a pretty lame excuse for the codes? H

 

I run my tank down to no pips around my area all the time without issue going after my 1000 kilometer tanks. Running low on fuel has no baring on anything. It has fuel or it doesn't. H

 

unless there is contamination in the bottom of the tank. was the mech right about you running on low fuel all the time?

agree with harold on the 12v, you should have it tested, to make sure it isn't a problem.

maybe starting up after 2 weeks stirred up the bottom of the tank.

 

the 'intake manifold issue' is from starting a car that had previously been shut down before completing the warm up cycle. it is a one off and not a regular issue. there is no fix.

why don't you pump the gas and check the 12 volt health instead of looking for some obscure cause?

 

Kdyj15 Bisco pretty well covered this issue. I personally have herd this weird sound when starting my 2014 prius a couple times. I don't think it something to be concerned with. Have your 12v checked. You want to see 12.6v after sitting over night. If you see 12.1 v your battery is week. You can check this with a multi meter. The 12v does not power the starter in your prius but it does control the PC's and that is why funny things happen when the 12v is weak. H

 

Yesterday my check engine light came on and the code was P0302. I had been low on gas and the previous 2 days it did rattle for a few seconds upon starting and idle rough then start like normal. Then yesterday the light came on so I got the code checked and called to get an appointment today (with the dealership which I hate but the only one available without waiting 2 weeks). As everything I've read says not to drive with a cylinder 2 misfire I wanted to check immediately. I know there are basic tests you can do yourself such as switching the coil and/or spark plug to a different cylinder to see if it throws a different code but don't have the appropriate tools to do so.

I explained all this to the dealership and they claimed they checked everything and needed to reflash the ECU system as that was causing it all. From what I have googled it does not seem related but perhaps I don't know enough about it. They said they changed my spark plugs 57,000 miles ago so they were "fine". When I get my report from the inspection they marked Fluid Leaks (engine/transmission/differential) and Exhaust System (damage/leaks/corrosion) as Needs Immediate Attention and yet claimed my car was good to go.

So I'm concerned that perhaps the issue is not actually diagnosed OR fixed. I do have to drive to and from work (30 min each way) the next 5 days before getting another appt. I don't have any other ride options and I have been following this forum for awhile and thought I'd put some feelers out on those that know more about Prius' than I do on whether their fix with the ECU reflash is legit or if I need to take it somewhere else.

On the paperwork they gave me it says this exactly: Inspected and found codes P0302, C2122, C2121, P0A0F, P3191, P0302, C2175. Rec reflash per TSB. I did google all the codes and some seem to have more to do with the sensors in the tires but also some just generally listing "engine does not start".

Any help or advice is much appreciated! I did put some cardboard under my car after I parked it once I read the fluid leak check box just to see if anything leaks under the car.

Thanks!