If the Check Hybrid System warning light comes up on your Lexus CT200h’s dash, it could mean that your battery is failing. Other causes include a blown fuse or inverter problems.
When an indicator light comes up in your Lexus, it can be a little stressful trying to determine the cause. While the CT200h’s Check Hybrid System Light can warn you about battery problems, it could also be trying to let you know of some more minor issues, and your car insurance
may not exactly be able to come to the rescue. Let’s consider all of the situations where the Check Hybrid System Light may come on in your Lexus CT200h. We’ll also go over how to change your hybrid’s battery if it turns out to be the problem.
What does the “check hybrid system” warning light mean?
Even though battery failure is one reason the Check Hybrid System Light may be illuminated, it’s not the only one—minor electrical issues, major engine problems, or other problems may be causing the light to turn on. However, it’s tough to know exactly what the problem is without taking your Lexus into the shop.
Here are some of the most common reasons your Check Hybrid System Light on your Lexus CT200h may turn on:
Inverter problems: Overheating can prevent the inverter from working properly
Blown fuse: If this fuse stops working, so does the battery
Malfunctioning battery cell: A wonky battery cell will make the battery go from fully charged to empty and back again
Some Lexus models have different tones for the lights to show how severe the issues in your hybrid are. If the Check Hybrid System Light is yellow, that means the issue isn’t serious—a red light indicates that there are major issues that should be dealt with as soon as possible.
Your mechanic will be able to scan for the code that will indicate the exact nature of the problem. The dreaded P0A80 code
means that the hybrid battery pack is malfunctioning. 
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When to replace your Lexus CT200h Hybrid battery
For a Lexus CT200h that has regular maintenance, the hybrid car battery will likely last for 150,000 miles or 15 years—although it can run longer as well. Since the Lexus CT200h was originally covered by a hybrid battery warranty of ten years/150,000 miles, you may still be able to get the replacement cost covered by the warranty.
The average cost for replacing a battery pack for the Lexus CT200h is between $4,342 and $4,442 and average labor costs can add between $385 and $486 to your bill. Depending on the trim, condition, and features of your CT200h, the replacement cost may not be worth it.
But if you’re sticking with your Lexus, you have some options for finding a cheaper replacement. If your Lexus is no longer covered under warranty, you can take it to an independent mechanic
and ask for a rebuilt battery. It won’t be as good of quality as a battery from Lexus, but it won’t cost you as much. But don’t jump to conclusions either! Just because the Check Hybrid System Light turns on doesn’t mean that your battery needs to be replaced. First, check the error codes
for the exact cause, take your Lexus to the garage for a check-up, or take a look under the hood yourself to see if the fuse or electronic control unit (ECU) is malfunctioning. Signs of hybrid battery failure
There are other signs that your Lexus CT200h hybrid battery is not doing so hot. Here are a few tell-tale signs to keep an eye out for:
Lower fuel economy. If you notice that you’re having to fill up more often, it could be a sign that your Lexus battery is struggling.
Erratic charge indicator. If the charge on your Lexus jumps around in a short amount of time, it could indicate there’s an issue with the battery.
Internal combustion engine (ICE) is overworked. Is your engine running louder than usual
or making weird noises? Straining sounds from your engine can also mean battery troubles. Lots more fan noise. To go with the above, overheating in the engine means that the fans will be working overtime to cool the engine down. More fan noise than usual is generally never good.
The same signs apply to any hybrid vehicle. Lexus’s current hybrid vehicles include:
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