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10

IIRC, the Prius has a step down voltage regulator which charges the 12v battery from the main power. I'd bet this system is having an issue and is not charging the battery. As for the 12v battery. I'd bet the old battery (the first replacement?) is good, but has dropped in voltage below what the charger can deal with. To overcome this, you need a second ...


7

That model of car can't recharge from a charging station. It charges the battery either from braking or by using the petrol engine as a generator. So yes, you should in theory get the 50mpg without a charging station. However it can depend. I have no idea of the type of driving and the quality of roads you'll be driving on. Most of the benefits come about ...


6

In short: no. To pass smog in California (and other CARB adopting states) the catalytic converter must be the one from the dealership or one that is in the Aftermarket Catalytic Converter Database. The catalytic converter must be one of those listed for the Toyota Prius, but unfortunately there is none for the Prius. For now the only possibility is to try ...


6

No, this is not possible. The high-voltage (HV) battery is used to start the engine. Remove this battery, and you soon find yourself unable to start the engine. The engine is started by motor-generators (MGs) operating on the HV battery, not a conventional starter motor operating on 12V auxiliary battery. Also, the simulated Atkinson cycle engine would ...


5

This is in theory possible, but I have no idea how to implement it in practice. The Prius HSD "Hybrid Synergy Drive" has, at its transmission heart, a planetary gearset with two power inputs: One from the internal combustion engine, and one from the AC motor/alternator. Each acts on a different element of the planetary set (carrier, ring, I don't recall ...


5

If you are strictly going by what the manufacturer states as a towing capacity for a vehicle, your vehicle wasn't designed with towing in mind. Looking at this page states the 2016 was the first Prius model made with towing in mind. It can tow a little over 1500lbs. If you want to follow Toyota manufacturing spec, you should not tow with your car. However, ...


5

The upstream o2 on a Prius is an AFR sensor stoich reading at idle is 3.33 volts. The application isn't able to read the correct PID. So of course it would read 0v all the time.


5

Follow up 10/4/2017 Since the incident reported below, I had the car diagnosed by Toyota and, as expected, they recommend replacing the instrument display unit (5 weeks to get the part and ~$900 in costs). In the last month we have now experienced 3 more "no display" events and I have been able to get the display back using the following "improved" ...


5

Not a specific answer for a Toyota Prius, but: This summer, we had an incident here in Germany, where the motor stopped after throwing the key out of the window. There's an online police report, so this is not a hoax. Here is my short translation: A 33 year old mother was driving her VW Passat on the highway (German "Autobahn") A1 near Lübeck with her ...


5

No, it will not stop mid-ride. It will warn you the key is no longer in the car, but as long as you don't turn it off, it will keep running until you run out of gas or the car battery dies. It would be a safety hazard for it to randomly die, or even a slow turn off. Imagine if you were on a 65mph high way when it happens, or in the middle of an intersection. ...


5

Your concern is valid. This article gives a good description of the weakness of smart keys. A man in the middle attack can fool the car to think that the key is inside allowing it to start. Once the car is running it won't shut off if the key leaves the car. These keys are battery powered and if that battery dies while you are driving on the highway it may ...


5

1) Can I shift it into neutral and push it out of the garage? You have a couple of choices to move the Prius out of the garage. You cannot shift it into neutral without the 12v battery. What you can do, however is jump the vehicle from the front end. Here is a picture I acquired from this website which shows where to put your jumper lead at (the pinkie ...


4

For a good explanation of RON vs MON for gasoline octane, see Refining Online. Since your vehicle requires Octane Rating 87 (which is probably (RON+MON)/2) or RON 91, and your fuel choices are RON 90 and RON 95, then technically it is most likely that only RON 95 will meet the requirement. Why? If the manufacturer considers RON 91 to be about Octane ...


4

The symptoms point to a failed Combination Meter. Besides the speedometer, it also controls the power off button and the dashboard lights (except the check engine light). Apparently it can also be rebuilt, but I could not find how is this repair done. There are some eBay ads of people who do it for about $150. It may resume working randomly. To stop the ...


4

The payload rating for the 2003 Toyota Prius V is 1047 lbs, so in theory 1000 lbs of extra weight is within tolerance of this vehicles payload. On the other hand, Toyota recommends that you do not tow anything with this vehicle, as it is not designed to do so. Personally, I would say that since the majority of the campers weight is on its own axle, you won'...


4

The Prius doesn't start traditionally. It actually has two motors, MG1 and MG2 (MG = Motor Generator.) MG1 replaces a traditional starter motor in the sense that it is responsible for spinning up the engine. If you've ever started a Prius while stopped, you might notice that it sounds different. That's because the computer first adjusts timing to reduce ...


4

Prius Gen4 (2017) apparently can go up to 72 mph with electricity only: https://priuschat.com/threads/what-is-the-max-ev-speed-no-ice.161545/ (message #5). However, that doesn't mean the tiny battery can propel the car forwards at that speed in all conditions. It just means the motor-generator 1 (MG1) won't overrev, because if the internal combustion engine (...


4

It's not possible - and it's probably not what you want anyway. My first Prius lasted over 350,000 miles (570,000 km) without any battery maintenance whatsoever. If there were a way to run without the battery, you would be making the petrol engine do much more work, increasing your maintenance cost. Toyota HSD is careful to avoid over-charging or ...


4

I can relate a story from my own experience with my daughter's car. Turns out it had two bad ignition coils that caused the engine to misfire when it was raining. Did she stop when the check engine light came on? Nope! So the unburned fuel from the misfiring cylinders ends up in the catalytic converter. These things are designed to handle mostly burned ...


3

The battery is probably not the problem... it sounds like the 12V battery charging device (the actual name is DC Converter/Inverter-- it's what priuses are using instead of alternators) is the problem. You can have the guys at most auto parts stores check your alternator (for free), and I would expect the test to be the about the same for whatever you use to ...


3

A dedicated spark plug socket is the way to go here. Regular deep well sockets don't work because the spark plug electrode will interfere with the square drive end. This is also why an extension will not help; there is nowhere for the electrode to be accommodated.


3

After advice posted to the comments of this question, I ended up looking at the backside of the bolts to size up the situation by pulling off the hatch paneling (how-to: https://www.youtube.com/watch?v=n3EJpG59rhw) and found this: I tried to hold the "nut" with a pliers while turning the bolt but was unsuccessful. Instead, I used a Dremel tool and a ...


3

Is the battery fine? Charge the 12V battery, which should be in the trunk, but there should be jumper / charging connections under the hood. Toyota uses a shift-by-wire functionality, so putting to neutral requires 12V battery to supply current to the electrical systems. Note also that the transmission (a planetary gearbox with 3 shafts) and both of the 2 ...


2

It all depends on whether your year of car supported the option or not. If it never had the option then you might as well buy the newer model. This is because retrofitting an option such as this would be extremely expensive, requiring wiring and computers and all kinds of things. If your year car had the option and just your trim line didn't offer it then ...


2

The easiest way to jump a Prius is from the front junction box as shown above (and detailed in your manual). Instead of a 20' jumper cable, which would be quite heavy, I would suggest buying or borrowing a battery-based jump starter device such as this. The last time I called a towing service to jump my Prius, they brought a battery-based device, which made ...


2

Don't leave the proximity key anywhere near the vehicle. It wakes the computer which will slowly drain the battery.


2

I took my car in to Toyota and it was a bad combo meter they had to hold my car until the new meter came in because the mileage on the car had to match the new meter. They told me it would be around three weeks. Well it's been 5 weeks and now they tell me since my car is old the clips around the radio might be brittle and break and I would have to pay ...


2

If the battery pack is completely worn out, you cannot use the Prius in a gasoline-only mode, because the high voltage battery pack is the only way the internal combustion engine can be started. There is no 12V starter motor in the Prius. If there is some juice and lifetime left in the battery, it can start the internal combustion engine, meaning that motor-...


2

No, it is not possible At least not without some mechanical modifications. This diagram shows how the Power Split device works. The Prius has two electric engines , Motor Generator 1 (MG2) and Motor Generator 2 (MG2), and one Internal Combustion Engine (ICE), linked by the Power Split Device (PSD). The MG2 is locked to the wheels (no clutch or torque ...


2

There is a Service Advisory from Toyota on this. I got my combo meter replaced on the 2007 Prius at Toyota's expense. I think there is a time and mileage limit for that. If you are within the limits, then Toyota will fix the issue for free and offer a free rental while the car is in the workshop


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