How do you know if your catalytic converter is bad on a Subaru?

Signs of a Bad Catalytic Converter on a Subaru
If you suspect that your catalytic converter may be bad on your Subaru, there are several signs you can look out for. It’s important to note that these signs can vary depending on the specific model and year of your Subaru. Here are some common signs to watch for:
1. Loss of Power: A clogged or failing catalytic converter can restrict the flow of exhaust gases, leading to a noticeable loss of power during acceleration.
2. Shuddering Under Acceleration: Another symptom of a bad catalytic converter is shuddering or jerking during acceleration.
3. Decreased Fuel Efficiency: A failing catalytic converter can cause a decrease in fuel efficiency, meaning you may need to refuel more frequently than usual.
4. Unusual Exhaust Odor: While a rotten egg smell is commonly associated with a failing catalytic converter, it’s important to note that not all bad converters produce this odor.
5. Check Engine Light (CEL): In some cases, a malfunctioning catalytic converter can trigger the check engine light to illuminate on your dashboard. If the CEL comes on, it’s recommended to have the code read by a professional to determine the exact cause.
It’s worth mentioning that catalytic converter failure in Subarus is relatively rare, and other issues can also cause similar symptoms. If you’re experiencing any of these signs, it’s best to have your vehicle inspected by a qualified mechanic to accurately diagnose the problem.
Please note that the information provided above is based on the search results and may not be exhaustive. It’s always a good idea to consult with a professional mechanic for an accurate diagnosis and appropriate repairs.
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How long does a catalytic converter last in a Subaru?

80,000 to 150,000 miles
Subaru catalytic converters will generally last anywhere from 80,000 to 150,000 miles. However, this can vary greatly depending on the make and model of Subaru, driving habits, and type of fuel used. Types of a Subaru catalytic converter? There are two types of Subaru catalytic converters- OEM and Aftermarket.

How do I know if my catalytic converter needs to be replaced?

Although there could be other reasons for a change in your car’s performance, a telltale sign of converter problems is decreased engine performance, including a wide range of symptoms such as reduced acceleration, sputtering, stalling, and increased fuel usage.

How does a car act when the catalytic converter is bad?

Check for symptoms.
As mentioned, common symptoms of a clogged catalytic converter include an illuminated check engine light, trouble starting the car, poor acceleration, a smell of sulfur or rotten eggs, engine misfires, and poor fuel economy.

How does a car act when the catalytic converter is gone?

Rough Driving and Acceleration
As your exhaust goes unregulated, your vehicle will drive more roughly. Your engine usually forces your exhaust through your catalytic converter. Without this component in place, this forceful exhaust push will lead to jarring, uneven acceleration.

What causes Subaru catalytic converter to go bad?

The inside of a catalytic converter can become contaminated by unburned gasoline — often due to an engine misfire, clogged air filter or bad oxygen sensor — or coolant that has likely leaked into the exhaust through a bad head gasket, or engine oil that has leaked past the piston rings or valve guides and is burned …

How do you test a catalytic converter?

To test for blockage, Access a pressure point before the catalytic converter, install a back pressure gauge and measure the back pressure. Normal reading should be less than 9 kPa @ idle and less than 20 kPa @ 2500 RPM. A high reading indicates the catalytic converter may be damaged or blocked.

What are 2 symptoms of a failed catalytic converter?

If you’re noticing sluggish engine performance, reduced acceleration, a smell of rotten eggs or sulfur from the exhaust, dark exhaust smoke, or extreme heat coming from under the vehicle, these are symptoms of a clogged Catalytic Converter, and it should be repaired soon.

Can I drive with a bad catalytic converter?

A Bad Catalytic Converter Can Burn Through Overtime
Most of the problems related to catalytic converters do not affect the function of your vehicle. If you have to deal with a fully plugged catalytic, avoid driving your car. If you notice smog coming from your car, it is best to seek professional help immediately.

How do I know if my catalytic converter is bad or o2 sensor?

To check if it’s a clogged cat versus a bad oxygen sensor (when you don’t have a check engine light), grab a vacuum gauge. Connect the gauge to an intake manifold vacuum line. Start the engine, let it idle, and check the reading on the gauge. This is your baseline vacuum.

Will a bad catalytic converter throw a code?

A common emissions code seen in the field, a P0420 trouble code indicates that the catalytic converter isn’t functioning efficiently. To work at peak efficiency, the emissions or feed gases entering the catalytic converter need to be perfectly balanced and not excessively elevated.