P0030

HO2S Heater Control Circuit (Bank 1 Sensor 1)

Q: What does fault code P0030 mean?

HO2S Heater Control Circuit (Bank 1 Sensor 1). The ECM has detected an open or short circuit in the heater control circuit of the upstream oxygen sensor (Sensor 1) on Bank 1.

Q: What are the possible causes of P0030?

Oxygen sensor heater resistance too high or open; Heater control circuit open or shorted to ground; Related fuse blown; ECM internal driver circuit failure.

Severity: Medium Fuel & Air Metering Generic Code

Detailed Description

The ECM has detected an open or short circuit in the heater control circuit of the upstream oxygen sensor (Sensor 1) on Bank 1.

Possible Causes

Oxygen sensor heater resistance too high or open

Heater control circuit open or shorted to ground

Related fuse blown

ECM internal driver circuit failure.

Solutions & Repair Guide

Measure resistance between oxygen sensor heater terminals (typically 2-15 ohms); Check heater power and ground circuits; Inspect the related fuse; Replace the oxygen sensor if the heater is open.

Disclaimer: The information above is for reference only and does not constitute professional repair advice. Actual causes may vary depending on vehicle make, model, year, and configuration. Always consult a qualified technician for accurate diagnosis.