Emissions code 0030

Asked by BlesstheLord Mar 08, 2017 at 01:28 PM about the 2001 BMW 7 Series 740iL RWD

Question type: Maintenance & Repair

What does that code mean, my car didn't pass
emissions ?

1 Answer
223,915

Rowefast answered 7 years ago

P0030 BMW - HO2S 11 Heater Control Circuit...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)...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.

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