Can i save my 07 pruis?

Scrap yard. 335000 miles is a whole lot of miles. Everything will just go downhill from here

 

Agreed. Any car past 300,000 miles is on borrowed time. The way I look at it, every modern car can hit 100,000 miles. Decent cars can hit 200,000 miles. Really good cars can hit 300,000 miles. And anything after that is a bonus. The Prius is a really good car, but everything has limits. If you replace the battery, something else will come up. Not worth fixing in my opinion.

 

welcome!
are you interested in learning how to rebuild the battery?

 

A difference greater than 1.2 Volts is really bad. A good battery threshold is 200 mV. I agree, it's toast. The P0420 code is the catalytic converter, another possibly expensive repair. And the problem is probably caused by excessive oil consumption and poor fuel combustion, and they're expensive to repair as well.

Best case you could hope for is to replace the engine and transaxle. Salvage parts are reasonable in cost if you can do the labor. And you might get lucky with rebuilding the battery and get another year out of it for a few hundred dollars. But maybe not.

 

+1. This car will be an uphill battle. Good for a cheap project, but it will be very expensive to keep it running.

 

you could try replacing the bad cells, you should get a few months.

 

there are lots of great battery repair threads here, try the one from member @ryousideways to start.
all the best!

 

I agree with others - cars with such a huge number of miles will generally nickel and dime you over the miles into poverty (okay not poverty, but be more expensive versus a lower mileage car). You may be able to replace some modules and do a rough refurbish of the battery (see battery rebuild/refurbish threads) with a couple of hundred in tools and a couple hundred in battery modules. Then you replace the cat for a few hundred. But in 5000 miles your water pump will go and you'll need new fuel injectors, or some other part will need replacing. Even if you can do the work yourself, the parts will quickly add up. Here are a couple of options you may not have thought about if you're mechanically handy:

Buy another wrecked 2nd gen Prius for parts (that has a battery and cat without a lot of miles). Whenever anything breaks on your car you can swap parts in as needed. Sell off un-needed parts on the wrecked Prius.

or

Buy a lower mileage used car and sell the parts on your car to get back what you paid for it. Even a Prius with a dead battery and bad cat will have a couple of thousand in parts that can be sold if you're willing to strip it.

 

Short answer: yes. There's a lot more to this than just swapping cells with low voltage (which will not provide a permanent fix). Do your research. A few google searches on rebuilding Prius batteries should get you on your way.

 

A dissenting opinion.

Of course this car be saved and used for tens of thousands of more miles.

Replace the 6.68 volt module. The end modules tend to run .1 volts under the rest. A half volt difference is large but you could try to use them. You already manged to take the battery apart. You should be able to replace a module. The second and third time you replace the next modules will go quicker.

In the US after market catalytic converters can be bought for about $300. Cat's can also be cleaned.

If you have more time than money this could still be the car you need.

Brad

 

I would put the battery back in as-in, then drive it around monitoring the voltage under load for each module using the Torque app. You are looking for a 1 volt difference or hopefully it will throw error code for that specific bad module.

Most likely it's only 1 or 2 modules at most that have gone bad.

The time to scrap a car is when the repair exceeds the value of the car.
Car is worth $3200 still. Repair DIY $60.
BAFX Products 34t5 Bluetooth OBDII Scan Tool $22