Possible causes

– Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit
– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit fuse
– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit open shorted to ground
– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit poor electrical connection
– Faulty Engine Control Module (ECM)

Tech notes

The code means that there is a problem with the heater element circuit of the heated oxygen sensor. The control module monitors how long it take the sensor to warm up and start sending an adequate signal. The code is triggered when the sensor is taking too long to warm up. Water getting inside the heated oxygen sensor connector can caused the heated oxygen sensor fuse to blow. Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors. If the sensor and connector are OK, replacing the O2 Sensor 1 usually takes care of the problem

HO2S Heater Control Circuit Bank 1 Sensor 1 is the generic definition for the P0030; however your vehicle’s manufacturer may have a different definition and information for the P0030 code.

When is the code detected?

The P0030 is set when the ECM detects an open or shorted to ground condition on the heated oxygen sensor heater circuit

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P0030 Description

Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. The faster the heated oxygen sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Engine Control Module (ECM).
In order to achieve the require temperature, a heater element is included inside the heated oxygen sensor. The ECM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground.
The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications.

http://cardiytool.com/images/2299.gif

P0030 Information for specific makes

P0030 AUDI
P0030 BMW
P0030 HYUNDAI
P0030 ISUZU
P0030 CADILLAC
P0030 KIA
P0030 MAZDA
P0030 SUBARU
P0030 SUZUKI
P0030 VOLKSWAGEN
P0030 VOLVO
P0030 BUICK
P0030 CHEVROLET
P0030 HUMMER
P0030 GMC
P0030 SATURN
P0030 PONTIAC