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. Next step is to measure the voltage at the oxygen sensor on Bank 2. Possible Solutions: First, inspect for exhaust leaks. * An oxygen sensor is not reading (functioning) properly * The catalytic converter is no longer functioning properly Symptoms: You will likely not notice any drivability problems, although there may be symptoms such as a rough/hard idle when cold.Ĭauses: A code P0430 may mean that one or more of the following has happened: It is part of the vehicle emissions system. P0430 - Catalyst System Efficiency Below Threshold (Bank 2)īasically this means that the oxygen sensor downstream of the catalytic converter on bank 2 is detecting that the converter is not working as efficiently as it should be (according to specs). SOURCE: 2003 chevrolet silverado v8 1500 with code 430
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