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What does it mean when my Catalyst system efficiency below threshold?
Code P0420 stands for “Catalyst System Efficiency Below Threshold (Bank 1).” Put simply, this code indicates that your car’s computer has detected underperformance from the Bank 1 catalytic converter. The P0420 Code indicates that your car’s computer has detected underperformance from the Bank 1 catalytic converter.
Does cold weather affect catalytic converter?
During cold-start, a car engine emits far more particulate matter and other pollutants than during warm conditions. This is because a cold catalytic converter is much less efficient at low exhaust gas temperatures.
What does the p0432 code on the ECU mean?
P0432 is a diagnostic trouble code (DTC) for “Main Catalyst Efficiency Below Threshold (Bank 2)”. This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation.
What does the post-catalyst O2 sensor do?
This sensor is used primarily for this purpose. It should switch much slower than the front oxygen sensors. If at any point the PCM detects that the post-catalyst o2 sensor is switching too rapidly (indicating no change between the inlet and outlet of the catalytic converter) it interprets this as a catalyst that isn’t functioning properly.
How does the PCM monitor the catalyst efficiency?
The PCM (Powertrain control module) monitors the catalyst efficiency by means of a post-catalyst Oxygen sensor. This sensor is used primarily for this purpose. It should switch much slower than the front oxygen sensors.
How does a catalytic converter improve tailpipe emissions?
A vehicles’ catalytic converter (catalyst) helps improve tailpipe emissions by oxygenating the exhaust gasses. It helps convert hydrocarbons (HC), Carbon Monoxide (CO), and oxides of Nitrogen (NOx) into water vapor (H20), Carbon Dioxide (CO2), and Nitrogen (N).