Learn what a P0030 code means, the most likely causes, and how to diagnose and fix the problem A P0030 code is defined as an HO2S Heater Control Circuit (Bank 1 Sensor 1). This is a generic code, as opposed to a manufacturer-specific code, and it pertains to the heater circuit for the upstream oxygen sensor. The upstream oxygen sensor is located before the catalytic converter and is used to monitor oxygen in the exhaust stream, as opposed to the downstream oxygen sensor which monitors catalytic converter efficiency. Why the … Read More

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