What is Warm Up Catalyst Efficiency Below Threshold Bank 1?
Error Code P0421 is described as Warm Up Catalyst Efficiency Below Threshold (Bank 1). This means the Catalytic Converter’s Oxygen Sensor Downstream has detected that the Bank 1 converter is not working properly.
Which oxygen sensor is bank 1 sensor 1?
Oxygen Sensor Identification A typical in-line 4-cylinder engine has only one bank (Bank 1). Therefore, in an in-line 4-cylinder engine, the term “Bank 1, Sensor 1” simply refers to the front oxygen sensor. “Bank 1, Sensor 2” is the rear oxygen sensor. A V6 or V8 engine has two banks (or two parts of that “V”).
What does code P0420 bank 1 mean?
The P0420 Code indicates that your car’s computer has detected underperformance from the Bank 1 catalytic converter. Bank 1 refers to the side of the engine that houses the number one cylinder.
Where is bank 1 sensor 1 O2 sensor located?
On most in-line engines, the bank 1 sensor 1 will be located at the engine’s front side, near the cylinder head. On most front-wheel-drive models with V6 engines, this sensor will be on the backside against the firewall. Most rear-wheel-drive cars and pickups will have this sensor on the passenger side.
What is the OBD II fault code P0420?
OBD II fault code P420 is a generic code that is defined as “Catalyst System Efficiency below Threshold Bank 1”, and is set when the PCM (Powertrain Control Module) detects that the catalytic converter on bank 1 is operating below a minimum allowable efficiency threshold.
Where can I find the OBD code for my car?
The o2 sensors in the emission system measure the catalytic converter efficiency. If the efficiency is lower than it should be, the ECU will store OBD-II code P0420. Using a car diagnostic software or obd2 scanner you may find this Obd2 code from ECU.
Why is there an OBD2 code on my catalytic converter?
As you can see there are quite a few issues that could cause the P0420 code to be stored by the ECU. It is worth taking the time to check them out thoroughly before you replace the catalytic converter. This P0420 obd2 code indicates that there is a problem with the catalytic converter, oxygen sensors or both.
When does the ECM set the P0420 code?
When the ECM/PCM sees the downstream O2 sensor switching at or near the same rate as the upstream O2 sensor, it sets the P0420 code. What Does the P0420 Code Mean?