![]() Many manufacturers give a five year, unlimited mileage warranty on these items. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. In fact, it would be a good idea to test each oxygen O2 sensor while you're at it. 100mV to 600mV) then it's time to replace the catalytic converter. ![]() The voltage should be low and steady ( 200mV, depends on the vehicle). Next step is to measure the voltage at the oxygen sensor on Bank 1 (the rear sensor, or the sensor after the converter). Possible Solutions: The simplest thing to do is to reset the code and see if it comes back. The catalytic converter is no longer functioning properlyĪn oxygen sensor is not reading (functioning) properly The code may be more likely to occur after the engine has had numerous cold starts in the past 1-2 days.Ĭauses A code P0421 may mean that one or more of the following has happened: Symptoms:You will likely not notice any drivability problems, although there may be symptoms. However, for bolt-on converters, the gaskets can wear out over time. Some vehicles have the converter welded onto the exhaust pipe and do not require this part. The catalytic converter gasket helps to provide an air-tight seal for the inlet and outlet of the catalytic converter. It is part of the vehicle emissions system. MAHLE Catalytic Converter Gasket - F32415. What does that mean?Basically this means that the oxygen sensor downstream of the catalytic converter on bank 1 is detecting that the converter is not working as efficiently as it should be (according to specs). Technical DescriptionWarm Up Catalyst Efficiency Below Threshold (Bank 1)
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