Question about Toyota Prius

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Loss of power with check engine light on

Scan tools do not have the capability to diagnose this vehicle. fuel filter ,air filter element remove and replace.check fuel return and it`s this vehicle design to shut out if you loosen the injector line on any of the cyclinders? or the line pressure low . problem is no scan tool to read codes .no spec on this .

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I had a similar problem and found that the fuel relay switch failing was the culprit There is a video on you tube Toyota Prius 2001 Engine warning fuel pump problem ODB Code P3191 which is helpful

Posted on May 21, 2014

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Do not try replacing various doubts as it will just waste your time and money both and may some major problem occur like stalling or some major failure as to avoid this the diagnostic is severly required. feel free for further queries thanks.

Posted on Sep 21, 2008

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First try to turning off the car and waiting about 10 minutes before restarting.

May be the accelerator sensor switch is at fault and should be replaced.

You need to go for service center for proper diagnose. Let me know if I can assist you further.


Posted on Sep 21, 2008

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It's a matter of because the check engine light came on and at the same time you have loss of power this indicates that the vehicle went into limp in mode. the only way to figure out why is to do a diagnostic on it so you don't spend hours trying to figure out the exact problem by guessing and replacing what you might think it is. there is a multitude of reasons for loss of power but the check engine light is a good indicater that the ecm threw a code or more. contrary to popular belief it is not an idiot light especially on a hybrid like the prius. if you loosen a line it will most likely stall not just lose power. the vehicles are pressure sensitive and would throw a code. you have an array of sensors just for the fuel system alone. if it were bad filters you would have rough idle ,hard starting ,or stalling while stopped. none of which you mentioned.

Posted on Sep 21, 2008

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Civic 06 vti using excesive amount of fuel

The computer will very likely be generating engine fault codes if you have quite excessive consumption and there is no point in guessing what the problem is as there can be numerous causes. You have not mentioned if you have a check engine light showing but if you don't just yet you soon will if the problem persists.

1. Go to a reputable mechanic and have the car scanned for fault codes because it will be very likely throwing some codes if you are having a high engine fuel consumption issue (as opposed to a loss of fuel from the fuel system due to an external fuel leak).

2. On thing you can do yourself is remove the old dusty air filter element in the air intake box ( which no doubt has not been changed since ????) and put in a new OEM air filter unit. A dirty clogged unit will cause your engine to run poorly.

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Truck is running rough. Changed intake gasket, brake booster, and put in new spark plugs. Truck runs good for a few miles then it runs rough again. What could this be?

Do you have a check engine light on ? Is it cold when it runs good an then not when it warms up ? You need to have a diagnostic scan tool hooked up , check engine sensor data parameters .Have a pro diagnose it before replacing parts .ECT - engine coolant temp . sensor , mass air flow sensor , O2 sensors , also check fuel trims , if you know what those are . Fuel trims are a good diagnostic tool , is the PCM adding fuel for lean condition ., low fuel pressure ,plugged fuel filter , worn fuel pump etc... Or is the PCM subtracting fuel , leaking fuel injectors , bad fuel pressure regulator . What make , model an year vehicle ?

Dec 23, 2015 | Cars & Trucks

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Increased fuel consumption

First-- fire your repair shop & get one that
listens to your explanation of vehicle problems

They have to diagnose the vehicle, not just tell
you no codes are present.

The check light will leave codes stored

Spark Plugs don't exactly make for a tune-up

For over 30 years the car computer does the tuning

The upstream or front oxygen sensors should be replaced
on all vehicles at 100,000 miles,was that done

Was fuel trim checked
Was any scan tool data looked at
Was the car road tested with scanner

Don't need 12 oz of injector cleaner in 15
gallons of fuel,that won't do a thing

There are at least a dozen tests that should be done,
at least once a year, on all vehicles,not wait until you
have a problem

The main theme on this web site,seems to be a
deteriorating repair shop capability & the vehicle
owners ability to communicate with them, as a result
of decades of distrust & dislike, as well as no understanding
of test equip costs & parts costs

The shaking could simply be from using the wrong oil &
not changing it 4 times a year or more & now you have
variable valve timing issues

So many things to to be checked out

Feb 28, 2013 | 2006 Toyota Corolla

2 Answers

Why is my gas milage so bad

Any details? ODB-1 is easy to diagnose if your lamp is on. Check air filter. Check fuel filter. Use no ethanol gas if possible. Check tire pressure and alignment. Remove excess cargo from the vehicle. Keep it clean.

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1 Answer

I keep getting a service engine soon light on and NO CODE on OBD

Have someone check it with a different scan tool it possible.Not all scan tools will work.If the light is coming on and you notice the vehicle is not running the same as before,there is a code in there and you have to get that code to diagnose the problem.

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1 Answer

Service engine light is on, and truck has no power going up the slightest grade, and is very sputtery. When going up a hill, the air conditiner stops blowing cool air, it's more like engine air, kind of...

When your vehicle has low power output it can mean several different things are occurring. You should know while your car has low performance it could be damaging components while you drive. Example: The emergency brake is on and you did not notice, this condition will burn up the rear brake pads or shoes and cause premature emergency brake failure. Or, the fuel filter is clogged causing thefuel pump to labor which can cause premature fuel pump failure. There are basically two kinds of low power conditions either the engine is running rough causing low power or the engine is running smoothly but still has low power. If the engine is running smoothly but has low power you are in the right place.
Step 1 - Scan for Trouble Codes - Check to see if the "service engine soon" light is on, if not continue to the next step. If the "check engine" (same thing as a service engine soon light, different manufacturers call it different things) light is illuminated you need to have the computer scanned for trouble codes. Use a simple scanner tool to retrieve trouble codes and check if they relate to the specific problem, like a fuel pump circuit failure code. If a trouble code is present but does not pertain to the immediate problem like an EVAP code ignore it until a later time, after the engine is running properly. The reason we repair non-related codes after the engine is running properly is because sometime false codes can be triggered by a poorly running engine. Once the engine is running properly the code present might cycle and turn itself off. You might say "if the engine isn't running right shouldn't it have a check engine light and a trouble code?" Sometimes conditions occur that will not be detected by the computer, example: if the intake or exhaust valve operation fails the computer cannot detect the failure because the problem is not sensor related, so the engine has no power and the computer thinks everything is ok with no codes. If the trouble code retrieved relates to a low power like a Mass Air Flow (MAF) sensor or ignition coil system failure repair these problems and re-test system. If no trouble codes are present proceed to the next step.
Step 2 - Check the Air Filter - A plugged air filter not allowing the proper amount of air into the engine. If air is not allowed to enter the engine's intake it will limit the engine power output. To check your engine air filter open the hood and remove the air filter from its housing and inspect, replace as needed and recheck.
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2003 audi A4 2.0, low idle, flashing yellow light on dash

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