![]() Test the Oxygen Sensors Typical Oxygen Sensor If your vehicle doesn’t have an exhaust leak, you’ll need to test the O2 sensors and/or catalytic converter. You should be able to hear it easily when looking underneath your Trax.Īn exhaust leak can cause P0420 since it causes exhaust gasses to escape unmetered. It would be a good idea to check your vehicle for an exhaust leak first. If your vehicle has any O2 sensor-related codes, jump to section three. You should see P0128 along with this code. When this happens, the exhaust the O2 sensors see will be out of range, and it could throw P0420. If your Trax’s computer doesn’t know the engine temperature, it’ll keep the fuel mixture rich. If you have a misfire-related code (such as P030X, where X is the misfiring cylinder) or P0300 (random multiple misfiring), it can cause the catalytic converter to overheat, which decreases its efficiency and throws P0420. Three types of codes can give clues as to what’s going on with your vehicle. The first thing you want to do when trying to fix P0420 in the Trax is to verify there aren’t any other trouble codes. Here’s a good P0420 diagnostic order for the Chevy Trax: 1. Before taking your Trax into an exhaust shop for an (expensive) new catalytic converter, let’s ensure that’s what you need. The most common fix for P0420 in the Chevy Trax is a new catalytic converter, followed by an O2 sensor replacement.
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