What causes a Subaru Outback to throw a P0420 code?
Outback Timing – If your Outback is misfiring or the exhaust timing is off, this can affect the gasses that are actually going to the O2 sensors enough to cause the P0420 code to register. Exhaust Leak – If there’s a noticeable exhaust leak coming from the vehicle it can change what the O2 sensors register enough to throw the P0420 code.
What does the OBDII code mean on a Subaru Outback?
Subaru Outback P0420 OBDII Code Defined. P0420 is a OBDII trouble code. The code technically stands for: Catalyst System Efficiency Below Threshold. Your Outback has at least two oxygen sensors, one before and after the catalytic converter.
What causes a service engine light on a Subaru Outback?
Service Engine Light – Often, this is the only symptom of the Subaru Outback P0420 code. There are many things that can cause the P0420 trouble code in your Outback. Here are the most common ones. Oxygen Sensor – The P0420 codes is thrown when the oxygen sensors on both sides of the exhaust have very similar readings.
What is the O2 sensor on a Subaru Outback?
The rear O2 sensor values changed to reflect the CAT is working as it should. No more dumping the oxygen. The fuel trim changed 4% over previous toward the positive also indicating a good combustion. The photo are at idle, cruise rpm then idle again.
What does P0420 mean on a Subaru Outback?
P0420 SUBARU Tech Notes. As the code description implies the P0420 code means that the vehicle’s control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting).
Subaru Outback P0420 OBDII Code Defined. P0420 is a OBDII trouble code. The code technically stands for: Catalyst System Efficiency Below Threshold. Your Outback has at least two oxygen sensors, one before and after the catalytic converter.
Service Engine Light – Often, this is the only symptom of the Subaru Outback P0420 code. There are many things that can cause the P0420 trouble code in your Outback. Here are the most common ones. Oxygen Sensor – The P0420 codes is thrown when the oxygen sensors on both sides of the exhaust have very similar readings.
Is the P0420 code a bad cat?
0420 is cat efficiency code which usually means bad cat. Cats and emission issues are common for all cars and factory recalls to fix issues is also common. But, there is usually a mileage limit. 8yrs and 100k miles usually pushes you beyond the warranty assistance. Actually, P0420 is frequently caused by a faulty O2 sensor, not a bad cat.
Outback Timing – If your Outback is misfiring or the exhaust timing is off, this can affect the gasses that are actually going to the O2 sensors enough to cause the P0420 code to register. Exhaust Leak – If there’s a noticeable exhaust leak coming from the vehicle it can change what the O2 sensors register enough to throw the P0420 code.
Where can I find the diagnostic trouble code for my Subaru Outback?
See: Diagnostic Trouble Code Descriptions\\List of Diagnostic Trouble Code (DTC)\\Engine (H4DO) Ref. to ENGINE (DIAGNOSTICS) (H4DO)>List of Diagnostic Trouble Code (DTC). Go to 2. 2. CHECK LEAK CHECK VALVE ASSEMBLY PUMP.
What makes a Subaru Outback run out of gas?
Typically, they’ll idle ok and drive normal under a light load. Whenever the engine is put under a heavy load it’ll feel like it is running out of gas. It’s very similar to the symptoms of a bad fuel filter. Service Engine Light – Often, this is the only symptom of the Subaru Outback P0420 code.